The (1) XENMEM_decrease_reservation, (2) XENMEM_populate_physmap, and (3) XENMEM_exchange hypercalls in Xen 4.2 and earlier allow local guest administrators to cause a denial of service (long loop and hang) via a crafted extent_order value.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2015-0068 for details.

The SUSE Linux Enterprise 10 Service Pack 3 LTSS Xen hypervisor and toolset have been updated to fix various security issues :

The following security issues have been addressed :

XSA-20: CVE-2012-4535: Xen 3.4 through 4.2, and possibly earlier versions, allows local guest OS administrators to cause a denial of service (Xen infinite loop and physical CPU consumption) by setting a VCPU with an 'inappropriate deadline'. (bnc#786516)

XSA-22: CVE-2012-4537: Xen 3.4 through 4.2, and possibly earlier versions, does not properly synchronize the p2m and m2p tables when the set_p2m_entry function fails, which allows local HVM guest OS administrators to cause a denial of service (memory consumption and assertion failure), aka 'Memory mapping failure DoS vulnerability'. (bnc#786517)

XSA-25: CVE-2012-4544: The PV domain builder in Xen 4.2 and earlier does not validate the size of the kernel or ramdisk (1) before or (2) after decompression, which allows local guest administrators to cause a denial of service (domain 0 memory consumption) via a crafted (a) kernel or (b) ramdisk.
(bnc#787163)

XSA-29: CVE-2012-5513: The XENMEM_exchange handler in Xen 4.2 and earlier does not properly check the memory address, which allows local PV guest OS administrators to cause a denial of service (crash) or possibly gain privileges via unspecified vectors that overwrite memory in the hypervisor reserved range. (bnc#789951)

XSA-31: CVE-2012-5515: The (1) XENMEM_decrease_reservation, (2) XENMEM_populate_physmap, and (3) XENMEM_exchange hypercalls in Xen 4.2 and earlier allow local guest administrators to cause a denial of service (long loop and hang) via a crafted extent_order value. (bnc#789950)

XSA-44: CVE-2013-1917: Xen 3.1 through 4.x, when running 64-bit hosts on Intel CPUs, does not clear the NT flag when using an IRET after a SYSENTER instruction, which allows PV guest users to cause a denial of service (hypervisor crash) by triggering a #GP fault, which is not properly handled by another IRET instruction. (bnc#813673)

XSA-47: CVE-2013-1920: Xen 4.2.x, 4.1.x, and earlier, when the hypervisor is running 'under memory pressure' and the Xen Security Module (XSM) is enabled, uses the wrong ordering of operations when extending the per-domain event channel tracking table, which causes a use-after-free and allows local guest kernels to inject arbitrary events and gain privileges via unspecified vectors. (bnc#813677)

XSA-55: CVE-2013-2196: Multiple unspecified vulnerabilities in the Elf parser (libelf) in Xen 4.2.x and earlier allow local guest administrators with certain permissions to have an unspecified impact via a crafted kernel, related to 'other problems' that are not CVE-2013-2194 or CVE-2013-2195. (bnc#823011)

XSA-55: CVE-2013-2195: The Elf parser (libelf) in Xen 4.2.x and earlier allow local guest administrators with certain permissions to have an unspecified impact via a crafted kernel, related to 'pointer dereferences' involving unexpected calculations. (bnc#823011)

XSA-55: CVE-2013-2194: Multiple integer overflows in the Elf parser (libelf) in Xen 4.2.x and earlier allow local guest administrators with certain permissions to have an unspecified impact via a crafted kernel. (bnc#823011)

XSA-63: CVE-2013-4355: Xen 4.3.x and earlier does not properly handle certain errors, which allows local HVM guests to obtain hypervisor stack memory via a (1) port or (2) memory mapped I/O write or (3) other unspecified operations related to addresses without associated memory.
(bnc#840592)

XSA-67: CVE-2013-4368: The outs instruction emulation in Xen 3.1.x, 4.2.x, 4.3.x, and earlier, when using FS: or GS:
segment override, uses an uninitialized variable as a segment base, which allows local 64-bit PV guests to obtain sensitive information (hypervisor stack content) via unspecified vectors related to stale data in a segment register. (bnc#842511)

XSA-73: CVE-2013-4494: Xen before 4.1.x, 4.2.x, and 4.3.x does not take the page_alloc_lock and grant_table.lock in the same order, which allows local guest administrators with access to multiple vcpus to cause a denial of service (host deadlock) via unspecified vectors. (bnc#848657)

XSA-76: CVE-2013-4554: Xen 3.0.3 through 4.1.x (possibly 4.1.6.1), 4.2.x (possibly 4.2.3), and 4.3.x (possibly 4.3.1) does not properly prevent access to hypercalls, which allows local guest users to gain privileges via a crafted application running in ring 1 or 2. (bnc#849668)

XSA-82: CVE-2013-6885: The microcode on AMD 16h 00h through 0Fh processors does not properly handle the interaction between locked instructions and write-combined memory types, which allows local users to cause a denial of service (system hang) via a crafted application, aka the errata 793 issue. (bnc#853049)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The SUSE Linux Enterprise Server 11 Service Pack 1 LTSS Xen hypervisor and toolset have been updated to fix various security issues and some bugs.

The following security issues have been addressed :

XSA-84: CVE-2014-1894: Xen 3.2 (and presumably earlier) exhibit both problems with the overflow issue being present for more than just the suboperations listed above. (bnc#860163)

XSA-84: CVE-2014-1892 CVE-2014-1893: Xen 3.3 through 4.1, while not affected by the above overflow, have a different overflow issue on FLASK_{GET,SET}BOOL and expose unreasonably large memory allocation to arbitrary guests.
(bnc#860163)

XSA-84: CVE-2014-1891: The FLASK_{GET,SET}BOOL, FLASK_USER and FLASK_CONTEXT_TO_SID suboperations of the flask hypercall are vulnerable to an integer overflow on the input size. The hypercalls attempt to allocate a buffer which is 1 larger than this size and is therefore vulnerable to integer overflow and an attempt to allocate then access a zero byte buffer. (bnc#860163)

XSA-82: CVE-2013-6885: The microcode on AMD 16h 00h through 0Fh processors does not properly handle the interaction between locked instructions and write-combined memory types, which allows local users to cause a denial of service (system hang) via a crafted application, aka the errata 793 issue. (bnc#853049)

XSA-76: CVE-2013-4554: Xen 3.0.3 through 4.1.x (possibly 4.1.6.1), 4.2.x (possibly 4.2.3), and 4.3.x (possibly 4.3.1) does not properly prevent access to hypercalls, which allows local guest users to gain privileges via a crafted application running in ring 1 or 2. (bnc#849668)

XSA-74: CVE-2013-4553: The XEN_DOMCTL_getmemlist hypercall in Xen 3.4.x through 4.3.x (possibly 4.3.1) does not always obtain the page_alloc_lock and mm_rwlock in the same order, which allows local guest administrators to cause a denial of service (host deadlock). (bnc#849667)

XSA-73: CVE-2013-4494: Xen before 4.1.x, 4.2.x, and 4.3.x does not take the page_alloc_lock and grant_table.lock in the same order, which allows local guest administrators with access to multiple vcpus to cause a denial of service (host deadlock) via unspecified vectors. (bnc#848657)

XSA-67: CVE-2013-4368: The outs instruction emulation in Xen 3.1.x, 4.2.x, 4.3.x, and earlier, when using FS: or GS:
segment override, uses an uninitialized variable as a segment base, which allows local 64-bit PV guests to obtain sensitive information (hypervisor stack content) via unspecified vectors related to stale data in a segment register. (bnc#842511)

XSA-66: CVE-2013-4361: The fbld instruction emulation in Xen 3.3.x through 4.3.x does not use the correct variable for the source effective address, which allows local HVM guests to obtain hypervisor stack information by reading the values used by the instruction. (bnc#841766)

XSA-63: CVE-2013-4355: Xen 4.3.x and earlier does not properly handle certain errors, which allows local HVM guests to obtain hypervisor stack memory via a (1) port or (2) memory mapped I/O write or (3) other unspecified operations related to addresses without associated memory.
(bnc#840592)

XSA-62: CVE-2013-1442: Xen 4.0 through 4.3.x, when using AVX or LWP capable CPUs, does not properly clear previous data from registers when using an XSAVE or XRSTOR to extend the state components of a saved or restored vCPU after touching other restored extended registers, which allows local guest OSes to obtain sensitive information by reading the registers. (bnc#839596)

XSA-61: CVE-2013-4329: The xenlight library (libxl) in Xen 4.0.x through 4.2.x, when IOMMU is disabled, provides access to a busmastering-capable PCI passthrough device before the IOMMU setup is complete, which allows local HVM guest domains to gain privileges or cause a denial of service via a DMA instruction. (bnc#839618)

XSA-60: CVE-2013-2212: The vmx_set_uc_mode function in Xen 3.3 through 4.3, when disabling chaches, allows local HVM guests with access to memory mapped I/O regions to cause a denial of service (CPU consumption and possibly hypervisor or guest kernel panic) via a crafted GFN range. (bnc#831120)

XSA-58: CVE-2013-1918: Certain page table manipulation operations in Xen 4.1.x, 4.2.x, and earlier are not preemptible, which allows local PV kernels to cause a denial of service via vectors related to 'deep page table traversal.' (bnc#826882)

XSA-58: CVE-2013-1432: Xen 4.1.x and 4.2.x, when the XSA-45 patch is in place, does not properly maintain references on pages stored for deferred cleanup, which allows local PV guest kernels to cause a denial of service (premature page free and hypervisor crash) or possible gain privileges via unspecified vectors. (bnc#826882)

XSA-57: CVE-2013-2211: The libxenlight (libxl) toolstack library in Xen 4.0.x, 4.1.x, and 4.2.x uses weak permissions for xenstore keys for paravirtualised and emulated serial console devices, which allows local guest administrators to modify the xenstore value via unspecified vectors.
(bnc#823608)

XSA-56: CVE-2013-2072: Buffer overflow in the Python bindings for the xc_vcpu_setaffinity call in Xen 4.0.x, 4.1.x, and 4.2.x allows local administrators with permissions to configure VCPU affinity to cause a denial of service (memory corruption and xend toolstack crash) and possibly gain privileges via a crafted cpumap. (bnc#819416)

XSA-55: CVE-2013-2196: Multiple unspecified vulnerabilities in the Elf parser (libelf) in Xen 4.2.x and earlier allow local guest administrators with certain permissions to have an unspecified impact via a crafted kernel, related to 'other problems' that are not CVE-2013-2194 or CVE-2013-2195. (bnc#823011)

XSA-55: CVE-2013-2195: The Elf parser (libelf) in Xen 4.2.x and earlier allow local guest administrators with certain permissions to have an unspecified impact via a crafted kernel, related to 'pointer dereferences' involving unexpected calculations. (bnc#823011)

XSA-55: CVE-2013-2194: Multiple integer overflows in the Elf parser (libelf) in Xen 4.2.x and earlier allow local guest administrators with certain permissions to have an unspecified impact via a crafted kernel. (bnc#823011)

XSA-53: CVE-2013-2077: Xen 4.0.x, 4.1.x, and 4.2.x does not properly restrict the contents of a XRSTOR, which allows local PV guest users to cause a denial of service (unhandled exception and hypervisor crash) via unspecified vectors.
(bnc#820919)

XSA-52: CVE-2013-2076: Xen 4.0.x, 4.1.x, and 4.2.x, when running on AMD64 processors, only save/restore the FOP, FIP, and FDP x87 registers in FXSAVE/FXRSTOR when an exception is pending, which allows one domain to determine portions of the state of floating point instructions of other domains, which can be leveraged to obtain sensitive information such as cryptographic keys, a similar vulnerability to CVE-2006-1056. NOTE: this is the documented behavior of AMD64 processors, but it is inconsistent with Intel processors in a security-relevant fashion that was not addressed by the kernels. (bnc#820917)

XSA-50: CVE-2013-1964: Xen 4.0.x and 4.1.x incorrectly releases a grant reference when releasing a non-v1, non-transitive grant, which allows local guest administrators to cause a denial of service (host crash), obtain sensitive information, or possible have other impacts via unspecified vectors. (bnc#816156)

XSA-49: CVE-2013-1952: Xen 4.x, when using Intel VT-d for a bus mastering capable PCI device, does not properly check the source when accessing a bridge device's interrupt remapping table entries for MSI interrupts, which allows local guest domains to cause a denial of service (interrupt injection) via unspecified vectors. (bnc#816163)

XSA-47: CVE-2013-1920: Xen 4.2.x, 4.1.x, and earlier, when the hypervisor is running 'under memory pressure' and the Xen Security Module (XSM) is enabled, uses the wrong ordering of operations when extending the per-domain event channel tracking table, which causes a use-after-free and allows local guest kernels to inject arbitrary events and gain privileges via unspecified vectors. (bnc#813677)

XSA-46: CVE-2013-1919: Xen 4.2.x and 4.1.x does not properly restrict access to IRQs, which allows local stub domain clients to gain access to IRQs and cause a denial of service via vectors related to 'passed-through IRQs or PCI devices.' (bnc#813675)

XSA-45: CVE-2013-1918: Certain page table manipulation operations in Xen 4.1.x, 4.2.x, and earlier are not preemptible, which allows local PV kernels to cause a denial of service via vectors related to 'deep page table traversal.' (bnc#816159)

XSA-44: CVE-2013-1917: Xen 3.1 through 4.x, when running 64-bit hosts on Intel CPUs, does not clear the NT flag when using an IRET after a SYSENTER instruction, which allows PV guest users to cause a denial of service (hypervisor crash) by triggering a #GP fault, which is not properly handled by another IRET instruction. (bnc#813673)

XSA-41: CVE-2012-6075: Buffer overflow in the e1000_receive function in the e1000 device driver (hw/e1000.c) in QEMU 1.3.0-rc2 and other versions, when the SBP and LPE flags are disabled, allows remote attackers to cause a denial of service (guest OS crash) and possibly execute arbitrary guest code via a large packet. (bnc#797523)

XSA-37: CVE-2013-0154: The get_page_type function in xen/arch/x86/mm.c in Xen 4.2, when debugging is enabled, allows local PV or HVM guest administrators to cause a denial of service (assertion failure and hypervisor crash) via unspecified vectors related to a hypercall. (bnc#797031)

XSA-36: CVE-2013-0153: The AMD IOMMU support in Xen 4.2.x, 4.1.x, 3.3, and other versions, when using AMD-Vi for PCI passthrough, uses the same interrupt remapping table for the host and all guests, which allows guests to cause a denial of service by injecting an interrupt into other guests.
(bnc#800275)

XSA-33: CVE-2012-5634: Xen 4.2.x, 4.1.x, and 4.0, when using Intel VT-d for PCI passthrough, does not properly configure VT-d when supporting a device that is behind a legacy PCI Bridge, which allows local guests to cause a denial of service to other guests by injecting an interrupt.
(bnc#794316)

XSA-31: CVE-2012-5515: The (1) XENMEM_decrease_reservation, (2) XENMEM_populate_physmap, and (3) XENMEM_exchange hypercalls in Xen 4.2 and earlier allow local guest administrators to cause a denial of service (long loop and hang) via a crafted extent_order value. (bnc#789950)

XSA-30: CVE-2012-5514: The guest_physmap_mark_populate_on_demand function in Xen 4.2 and earlier does not properly unlock the subject GFNs when checking if they are in use, which allows local guest HVM administrators to cause a denial of service (hang) via unspecified vectors. (bnc#789948)

XSA-29: CVE-2012-5513: The XENMEM_exchange handler in Xen 4.2 and earlier does not properly check the memory address, which allows local PV guest OS administrators to cause a denial of service (crash) or possibly gain privileges via unspecified vectors that overwrite memory in the hypervisor reserved range. (bnc#789951)

XSA-27: CVE-2012-6333: Multiple HVM control operations in Xen 3.4 through 4.2 allow local HVM guest OS administrators to cause a denial of service (physical CPU consumption) via a large input. (bnc#789944)

XSA-27: CVE-2012-5511: Stack-based buffer overflow in the dirty video RAM tracking functionality in Xen 3.4 through 4.1 allows local HVM guest OS administrators to cause a denial of service (crash) via a large bitmap image.
(bnc#789944)

XSA-26: CVE-2012-5510: Xen 4.x, when downgrading the grant table version, does not properly remove the status page from the tracking list when freeing the page, which allows local guest OS administrators to cause a denial of service (hypervisor crash) via unspecified vectors. (bnc#789945)

XSA-25: CVE-2012-4544: The PV domain builder in Xen 4.2 and earlier does not validate the size of the kernel or ramdisk (1) before or (2) after decompression, which allows local guest administrators to cause a denial of service (domain 0 memory consumption) via a crafted (a) kernel or (b) ramdisk.
(bnc#787163)

XSA-24: CVE-2012-4539: Xen 4.0 through 4.2, when running 32-bit x86 PV guests on 64-bit hypervisors, allows local guest OS administrators to cause a denial of service (infinite loop and hang or crash) via invalid arguments to GNTTABOP_get_status_frames, aka 'Grant table hypercall infinite loop DoS vulnerability.' (bnc#786520)

XSA-23: CVE-2012-4538: The HVMOP_pagetable_dying hypercall in Xen 4.0, 4.1, and 4.2 does not properly check the pagetable state when running on shadow pagetables, which allows a local HVM guest OS to cause a denial of service (hypervisor crash) via unspecified vectors. (bnc#786519)

XSA-22: CVE-2012-4537: Xen 3.4 through 4.2, and possibly earlier versions, does not properly synchronize the p2m and m2p tables when the set_p2m_entry function fails, which allows local HVM guest OS administrators to cause a denial of service (memory consumption and assertion failure), aka 'Memory mapping failure DoS vulnerability.' (bnc#786517)

XSA-20: CVE-2012-4535: Xen 3.4 through 4.2, and possibly earlier versions, allows local guest OS administrators to cause a denial of service (Xen infinite loop and physical CPU consumption) by setting a VCPU with an 'inappropriate deadline.' (bnc#786516)

XSA-19: CVE-2012-4411: The graphical console in Xen 4.0, 4.1 and 4.2 allows local OS guest administrators to obtain sensitive host resource information via the qemu monitor.
NOTE: this might be a duplicate of CVE-2007-0998.
(bnc#779212)

XSA-15: CVE-2012-3497: (1) TMEMC_SAVE_GET_CLIENT_WEIGHT, (2) TMEMC_SAVE_GET_CLIENT_CAP, (3) TMEMC_SAVE_GET_CLIENT_FLAGS and (4) TMEMC_SAVE_END in the Transcendent Memory (TMEM) in Xen 4.0, 4.1, and 4.2 allow local guest OS users to cause a denial of service (NULL pointer dereference or memory corruption and host crash) or possibly have other unspecified impacts via a NULL client id. (bnc#777890)

Also the following non-security bugs have been fixed :

  - xen hot plug attach/detach fails modified     blktap-pv-cdrom.patch. (bnc#805094)

  - guest 'disappears' after live migration Updated     block-dmmd script. (bnc#777628)

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update fixes the following security issues in xen :

  - CVE-2012-5513: XENMEM_exchange may overwrite hypervisor     memory (XSA-29)

  - CVE-2012-5515: Several memory hypercall operations allow     invalid extent order values (XSA-31)

Also the following bugs have been fixed and upstream patches have been applied: 26134-x86-shadow-invlpg-check.patch

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote OracleVM system is missing necessary patches to address critical security updates :

XSA-27: hvm: Limit the size of large HVM op batches [orabug 15907978] (CVE-2012-5511) XSA-29: add missing guest address range checks to XENMEM_exchange handlers [orabug 15907996] (CVE-2012-5513) XSA-30:
xen: fix error handling of guest_physmap_mark_populate_on_demand [orabug 15908008] (CVE-2012-5514) XSA-31: memop: limit guest specified extent order [orabug 15908028] (CVE-2012-5515)

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2012-0057 for details.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - xen: fix error handling of     guest_physmap_mark_populate_on_demand The only user of     the 'out' label bypasses a necessary unlock, thus     enabling the caller to lock up Xen. Also, the function     was never meant to be called by a guest for itself, so     rather than inspecting the code paths in depth for     potential other problems this might cause, and adjusting     e.g. the non-guest printk in the above error path, just     disallow the guest access to it. Finally, the printk     (considering its potential of spamming the log, the more     that it's not using XENLOG_GUEST), is being converted to     P2M_DEBUG, as debugging is what it apparently was added     for in the first place. This is XSA-30 / CVE-2012-5514.
    (CVE-2012-5514)

  - Revert version 2 of XSA-30 / CVE-2012-5514     (CVE-2012-5514)

  - memop: limit guest specified extent order Allowing     unbounded order values here causes almost unbounded     loops and/or partially incomplete requests, particularly     in PoD code. The added range checks in populate_physmap,     decrease_reservation, and the 'in' one in     memory_exchange architecturally all could use PADDR_BITS
    - PAGE_SHIFT, and are being artificially constrained to     MAX_ORDER. This is XSA-31 / CVE-2012-5515.
    (CVE-2012-5515)

  - xen: fix error path of     guest_physmap_mark_populate_on_demand The only user of     the 'out' label bypasses a necessary unlock, thus     enabling the caller to lock up Xen. This is XSA-30 /     CVE-2012-5514. (CVE-2012-5514)

  - xen: add missing guest address range checks to     XENMEM_exchange handlers Ever since its existence (3.0.3     iirc) the handler for this has been using non address     range checking guest memory accessors (i.e. the ones     prefixed with two underscores) without first range     checking the accessed space (via guest_handle_okay),     allowing a guest to access and overwrite hypervisor     memory. This is XSA-29 / CVE-2012-5513.

  - hvm: Limit the size of large HVM op batches Doing large     p2m updates for HVMOP_track_dirty_vram without     preemption ties up the physical processor. Integrating     preemption into the p2m updates is hard so simply limit     to 1GB which is sufficient for a 15000 * 15000 * 32bpp     framebuffer. For HVMOP_modified_memory and     HVMOP_set_mem_type preemptible add the necessary     machinery to handle preemption. This is CVE-2012-5511 /     XSA-27.

    x86/paging: Don't allocate user-controlled amounts of     stack memory. This is XSA-27 / CVE-2012-5511.

    v2: Provide definition of GB to fix x86-32 compile.

  - xen/common/grant_table.c gnttab: fix releasing of memory     upon switches between versions     gnttab_unpopulate_status_frames incompletely freed the     pages previously used as status frame in that they did     not get removed from the domain's xenpage_list, thus     causing subsequent list corruption when those pages did     get allocated again for the same or another purpose.
    Similarly, grant_table_create and gnttab_grow_table both     improperly clean up in the event of an error - pages     already shared with the guest can't be freed by just     passing them to free_xenheap_page. Fix this by sharing     the pages only after all allocations succeeded. This is     CVE-2012-5510 / XSA-26. (CVE-2012-5510)

XEN was updated to fix various bugs and security issues :

Security issues fixed :

  - bnc#800275 - CVE-2013-0153: xen: interrupt remap entries     shared and old ones not cleared on AMD IOMMUs

  - bnc#797523 - CVE-2012-6075: qemu / kvm-qemu: e1000     overflows under some conditions

  - bnc#797031 - Xen Security Advisory 37 (CVE-2013-0154) -     Hypervisor crash due to incorrect ASSERT (debug build     only)

  - bnc#794316 - CVE-2012-5634: xen: VT-d interrupt     remapping source validation flaw (XSA-33)

Bugs fixed :

  - Upstream patches from Jan 26536-xenoprof-div-by-0.patch     26578-AMD-IOMMU-replace-BUG_ON.patch     26656-x86-fix-null-pointer-dereference-in-intel_get_exte     nded_msrs.patch     26659-AMD-IOMMU-erratum-746-workaround.patch     26660-x86-fix-CMCI-injection.patch     26672-vmx-fix-handling-of-NMI-VMEXIT.patch     26673-Avoid-stale-pointer-when-moving-domain-to-another-     cpupool.patch     26676-fix-compat-memory-exchange-op-splitting.patch     26677-x86-make-certain-memory-sub-ops-return-valid-value     s.patch 26678-SEDF-avoid-gathering-vCPU-s-on-pCPU0.patch     26679-x86-defer-processing-events-on-the-NMI-exit-path.p     atch     26683-credit1-Use-atomic-bit-operations-for-the-flags-st     ructure.patch     26692-x86-MSI-fully-protect-MSI-X-table.patch

  - bnc#805094 - xen hot plug attach/detach fails modified     blktap-pv-cdrom.patch

  - bnc#802690 - domain locking can prevent a live migration     from completing modified xend-domain-lock.patch

  - bnc#797014 - no way to control live migrations     26547-tools-xc_fix_logic_error_in_stdiostream_progress.p     atch     26548-tools-xc_handle_tty_output_differently_in_stdiostr     eam_progress.patch     26549-tools-xc_turn_XCFLAGS__into_shifts.patch     26550-tools-xc_restore_logging_in_xc_save.patch     26551-tools-xc_log_pid_in_xc_save-xc_restore_output.patc     h     26675-tools-xentoollog_update_tty_detection_in_stdiostre     am_progress.patch     xen.migrate.tools-xc_print_messages_from_xc_save_with_xc
    _report.patch     xen.migrate.tools-xc_document_printf_calls_in_xc_restore     .patch     xen.migrate.tools-xc_rework_xc_save.cswitch_qemu_logdirt     y.patch     xen.migrate.tools_set_migration_constraints_from_cmdline     .patch     xen.migrate.tools_add_xm_migrate_--log_progress_option.p     atch

  - remove old patches: xen.xc.progress.patch     xen.xc_save.details.patch     xen.migration.abort_if_busy.patch

  - bnc#806736: enabling xentrace crashes hypervisor     26686-xentrace_fix_off-by-one_in_calculate_tbuf_size.pat     ch

  - Upstream patches from Jan     26287-sched-credit-pick-idle.patch     26501-VMX-simplify-CR0-update.patch     26502-VMX-disable-SMEP-when-not-paging.patch     26516-ACPI-parse-table-retval.patch (Replaces     CVE-2013-0153-xsa36.patch)     26517-AMD-IOMMU-clear-irtes.patch (Replaces     CVE-2013-0153-xsa36.patch)     26518-AMD-IOMMU-disable-if-SATA-combined-mode.patch     (Replaces CVE-2013-0153-xsa36.patch)     26519-AMD-IOMMU-perdev-intremap-default.patch (Replaces     CVE-2013-0153-xsa36.patch) 26526-pvdrv-no-devinit.patch     26531-AMD-IOMMU-IVHD-special-missing.patch (Replaces     CVE-2013-0153-xsa36.patch)

  - bnc#798188 - Add $network to xend initscript     dependencies

  - bnc#797014 - no way to control live migrations

  - fix logic error in stdiostream_progress     xen.xc.progress.patch

  - restore logging in xc_save xen.xc_save.details.patch

  - add options to control migration tunables

    --max_iters, --max_factor, --abort_if_busy     xen.migration.abort_if_busy.patch

  - bnc#799694 - Unable to dvd or cdrom-boot DomU after     xen-tools update Fixed with update to Xen version 4.1.4

  - bnc#800156 - L3: HP iLo Generate NMI function not     working in XEN kernel 26440-x86-forward-SERR.patch

  - Upstream patches from Jan     26404-x86-forward-both-NMI-kinds.patch     26427-x86-AMD-enable-WC+.patch 

  - bnc#793927 - Xen VMs with more than 2 disks randomly     fail to start 25590-hotplug-locking.patch     25595-hotplug-locking.patch 26079-hotplug-locking.patch

  - Upstream patches from Jan     26332-x86-compat-show-guest-stack-mfn.patch     26333-x86-get_page_type-assert.patch (Replaces     CVE-2013-0154-xsa37.patch)     26340-VT-d-intremap-verify-legacy-bridge.patch (Replaces     CVE-2012-5634-xsa33.patch)     26370-libxc-x86-initial-mapping-fit.patch

  - Update to Xen 4.1.4 c/s 23432

  - Update xenpaging.guest-memusage.patch add rule for     xenmem to avoid spurious build failures

  - Upstream patches from Jan 26179-PCI-find-next-cap.patch     26183-x86-HPET-masking.patch     26188-x86-time-scale-asm.patch     26200-IOMMU-debug-verbose.patch     26203-x86-HAP-dirty-vram-leak.patch     26229-gnttab-version-switch.patch (Replaces     CVE-2012-5510-xsa26.patch)     26230-x86-HVM-limit-batches.patch (Replaces     CVE-2012-5511-xsa27.patch)     26231-memory-exchange-checks.patch (Replaces     CVE-2012-5513-xsa29.patch)     26232-x86-mark-PoD-error-path.patch (Replaces     CVE-2012-5514-xsa30.patch)     26233-memop-order-checks.patch (Replaces     CVE-2012-5515-xsa31.patch)     26235-IOMMU-ATS-max-queue-depth.patch     26272-x86-EFI-makefile-cflags-filter.patch     26294-x86-AMD-Fam15-way-access-filter.patch     CVE-2013-0154-xsa37.patch

  - Restore c/s 25751 in 23614-x86_64-EFI-boot.patch. Modify     the EFI Makefile to do additional filtering.
    EFI-makefile-cflags-filter.patch

XEN was updated to fix various bugs and security issues :

Security issues fixed :

  - bnc#800275 - CVE-2013-0153: xen: interrupt remap entries     shared and old ones not cleared on AMD IOMMUs

  - bnc#797523 - CVE-2012-6075: qemu / kvm-qemu: e1000     overflows under some conditions

  - bnc#797031 - Xen Security Advisory 37 (CVE-2013-0154) -     Hypervisor crash due to incorrect ASSERT (debug build     only)

  - bnc#794316 - CVE-2012-5634: xen: VT-d interrupt     remapping source validation flaw (XSA-33) 

Bugs fixed :

  - Upstream patches from Jan 26536-xenoprof-div-by-0.patch     26578-AMD-IOMMU-replace-BUG_ON.patch     26656-x86-fix-null-pointer-dereference-in-intel_get_exte     nded_msrs.patch     26659-AMD-IOMMU-erratum-746-workaround.patch     26660-x86-fix-CMCI-injection.patch     26672-vmx-fix-handling-of-NMI-VMEXIT.patch     26673-Avoid-stale-pointer-when-moving-domain-to-another-     cpupool.patch     26676-fix-compat-memory-exchange-op-splitting.patch     26677-x86-make-certain-memory-sub-ops-return-valid-value     s.patch 26678-SEDF-avoid-gathering-vCPU-s-on-pCPU0.patch     26679-x86-defer-processing-events-on-the-NMI-exit-path.p     atch     26683-credit1-Use-atomic-bit-operations-for-the-flags-st     ructure.patch     26692-x86-MSI-fully-protect-MSI-X-table.patch

  - bnc#805094 - xen hot plug attach/detach fails modified     blktap-pv-cdrom.patch

  - bnc#802690 - domain locking can prevent a live migration     from completing modified xend-domain-lock.patch

  - bnc#797014 - no way to control live migrations     26547-tools-xc_fix_logic_error_in_stdiostream_progress.p     atch     26548-tools-xc_handle_tty_output_differently_in_stdiostr     eam_progress.patch     26549-tools-xc_turn_XCFLAGS__into_shifts.patch     26550-tools-xc_restore_logging_in_xc_save.patch     26551-tools-xc_log_pid_in_xc_save-xc_restore_output.patc     h     26675-tools-xentoollog_update_tty_detection_in_stdiostre     am_progress.patch     xen.migrate.tools-xc_print_messages_from_xc_save_with_xc
    _report.patch     xen.migrate.tools-xc_document_printf_calls_in_xc_restore     .patch     xen.migrate.tools-xc_rework_xc_save.cswitch_qemu_logdirt     y.patch     xen.migrate.tools_set_migration_constraints_from_cmdline     .patch     xen.migrate.tools_add_xm_migrate_--log_progress_option.p     atch

  - remove old patches: xen.xc.progress.patch     xen.xc_save.details.patch     xen.migration.abort_if_busy.patch

  - bnc#806736: enabling xentrace crashes hypervisor     26686-xentrace_fix_off-by-one_in_calculate_tbuf_size.pat     ch

  - Upstream patches from Jan     26287-sched-credit-pick-idle.patch     26501-VMX-simplify-CR0-update.patch     26502-VMX-disable-SMEP-when-not-paging.patch     26516-ACPI-parse-table-retval.patch (Replaces     CVE-2013-0153-xsa36.patch)     26517-AMD-IOMMU-clear-irtes.patch (Replaces     CVE-2013-0153-xsa36.patch)     26518-AMD-IOMMU-disable-if-SATA-combined-mode.patch     (Replaces CVE-2013-0153-xsa36.patch)     26519-AMD-IOMMU-perdev-intremap-default.patch (Replaces     CVE-2013-0153-xsa36.patch) 26526-pvdrv-no-devinit.patch     26531-AMD-IOMMU-IVHD-special-missing.patch (Replaces     CVE-2013-0153-xsa36.patch)

  - bnc#798188 - Add $network to xend initscript     dependencies

  - bnc#797014 - no way to control live migrations

  - fix logic error in stdiostream_progress     xen.xc.progress.patch

  - restore logging in xc_save xen.xc_save.details.patch

  - add options to control migration tunables

    --max_iters, --max_factor, --abort_if_busy     xen.migration.abort_if_busy.patch

  - bnc#799694 - Unable to dvd or cdrom-boot DomU after     xen-tools update Fixed with update to Xen version 4.1.4

  - bnc#800156 - L3: HP iLo Generate NMI function not     working in XEN kernel 26440-x86-forward-SERR.patch

  - Upstream patches from Jan     26404-x86-forward-both-NMI-kinds.patch     26427-x86-AMD-enable-WC+.patch

  - bnc#793927 - Xen VMs with more than 2 disks randomly     fail to start 25590-hotplug-locking.patch     25595-hotplug-locking.patch 26079-hotplug-locking.patch

  - Upstream patches from Jan     26332-x86-compat-show-guest-stack-mfn.patch     26333-x86-get_page_type-assert.patch (Replaces     CVE-2013-0154-xsa37.patch)     26340-VT-d-intremap-verify-legacy-bridge.patch (Replaces     CVE-2012-5634-xsa33.patch)     26370-libxc-x86-initial-mapping-fit.patch

  - Update to Xen 4.1.4 c/s 23432 

  - Update xenpaging.guest-memusage.patch add rule for     xenmem to avoid spurious build failures

  - Upstream patches from Jan 26179-PCI-find-next-cap.patch     26183-x86-HPET-masking.patch     26188-x86-time-scale-asm.patch     26200-IOMMU-debug-verbose.patch     26203-x86-HAP-dirty-vram-leak.patch     26229-gnttab-version-switch.patch (Replaces     CVE-2012-5510-xsa26.patch)     26230-x86-HVM-limit-batches.patch (Replaces     CVE-2012-5511-xsa27.patch)     26231-memory-exchange-checks.patch (Replaces     CVE-2012-5513-xsa29.patch)     26232-x86-mark-PoD-error-path.patch (Replaces     CVE-2012-5514-xsa30.patch)     26233-memop-order-checks.patch (Replaces     CVE-2012-5515-xsa31.patch)     26235-IOMMU-ATS-max-queue-depth.patch     26272-x86-EFI-makefile-cflags-filter.patch     26294-x86-AMD-Fam15-way-access-filter.patch     CVE-2013-0154-xsa37.patch

  - Restore c/s 25751 in 23614-x86_64-EFI-boot.patch. Modify     the EFI Makefile to do additional filtering.
    EFI-makefile-cflags-filter.patch

This update of XEN fixes various denial of service bugs.

  - bnc#789945 - CVE-2012-5510: xen: Grant table version     switch list corruption vulnerability (XSA-26)

  - bnc#789944 - CVE-2012-5511: xen: Several HVM operations     do not validate the range of their inputs (XSA-27)

  - bnc#789940 - CVE-2012-5512: xen: HVMOP_get_mem_access     crash / HVMOP_set_mem_access information leak (XSA-28)

  - bnc#789951 - CVE-2012-5513: xen: XENMEM_exchange may     overwrite hypervisor memory (XSA-29)

  - bnc#789948 - CVE-2012-5514: xen: Missing unlock in     guest_physmap_mark_populate_on_demand() (XSA-30)

  - bnc#789950 - CVE-2012-5515: xen: Several memory     hypercall operations allow invalid extent order values     (XSA-31)

  - bnc#789988 - FATAL PAGE FAULT in hypervisor     (arch_do_domctl)     25931-x86-domctl-iomem-mapping-checks.patch

  - Upstream patches from Jan     26132-tmem-save-NULL-check.patch     26134-x86-shadow-invlpg-check.patch     26148-vcpu-timer-overflow.patch (Replaces     CVE-2012-4535-xsa20.patch)     26149-x86-p2m-physmap-error-path.patch (Replaces     CVE-2012-4537-xsa22.patch)     26150-x86-shadow-unhook-toplevel-check.patch (Replaces     CVE-2012-4538-xsa23.patch)     26151-gnttab-compat-get-status-frames.patch (Replaces     CVE-2012-4539-xsa24.patch)

  - bnc#777628 - guest 'disappears' after live migration     Updated block-dmmd script

  - Fix exception in balloon.py and osdep.py     xen-max-free-mem.diff

  - bnc#792476 - efi files missing in latest XEN update     Revert c/s 25751 EFI Makefile changes in     23614-x86_64-EFI-boot.patch

XEN was updated to fix various denial of service issues.

  - bnc#789945 - CVE-2012-5510: xen: Grant table version     switch list corruption vulnerability (XSA-26)

  - bnc#789944 - CVE-2012-5511: xen: Several HVM operations     do not validate the range of their inputs (XSA-27)

  - bnc#789940 - CVE-2012-5512: xen: HVMOP_get_mem_access     crash / HVMOP_set_mem_access information leak (XSA-28)

  - bnc#789951 - CVE-2012-5513: xen: XENMEM_exchange may     overwrite hypervisor memory (XSA-29)

  - bnc#789948 - CVE-2012-5514: xen: Missing unlock in     guest_physmap_mark_populate_on_demand() (XSA-30)

  - bnc#789950 - CVE-2012-5515: xen: Several memory     hypercall operations allow invalid extent order values     (XSA-31)

  - bnc#789988 - FATAL PAGE FAULT in hypervisor     (arch_do_domctl)

  - Upstream patches from Jan     26132-tmem-save-NULL-check.patch     26134-x86-shadow-invlpg-check.patch     26148-vcpu-timer-overflow.patch (Replaces     CVE-2012-4535-xsa20.patch)     26149-x86-p2m-physmap-error-path.patch (Replaces     CVE-2012-4537-xsa22.patch)     26150-x86-shadow-unhook-toplevel-check.patch (Replaces     CVE-2012-4538-xsa23.patch)

  - bnc#777628 - guest 'disappears' after live migration     Updated block-dmmd script

  - Fix exception in balloon.py and osdep.py     xen-max-free-mem.diff

  - bnc#792476 - efi files missing in latest XEN update     Revert c/s 25751 EFI Makefile changes in     23614-x86_64-EFI-boot.patch

The remote host is affected by the vulnerability described in GLSA-201309-24 (Xen: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Xen. Please review the       CVE identifiers referenced below for details.
  Impact :

    Guest domains could possibly gain privileges, execute arbitrary code, or       cause a Denial of Service on the host domain (Dom0). Additionally, guest       domains could gain information about other virtual machines running on       the same host or read arbitrary files on the host.
  Workaround :

    The CVEs listed below do not currently have fixes, but only apply to Xen       setups which have &ldquo;tmem&rdquo; specified on the hypervisor command line.
      TMEM is not currently supported for use in production systems, and       administrators using tmem should disable it.
      Relevant CVEs:
      * CVE-2012-2497
      * CVE-2012-6030
      * CVE-2012-6031
      * CVE-2012-6032
      * CVE-2012-6033
      * CVE-2012-6034
      * CVE-2012-6035
      * CVE-2012-6036

From Red Hat Security Advisory 2013:0168 :

Updated kernel packages that fix three security issues and several bugs are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

This update fixes the following security issues :

* It was found that the Xen hypervisor implementation did not perform range checking on the guest provided values in multiple hypercalls. A privileged guest user could use this flaw to trigger long loops, leading to a denial of service (Xen hypervisor hang). (CVE-2012-5515, Moderate)

* It was found that when running a 32-bit binary that uses a large number of shared libraries, one of the libraries would always be loaded at a predictable address in memory. An attacker could use this flaw to bypass the Address Space Layout Randomization (ASLR) security feature. (CVE-2012-1568, Low)

* A flaw was found in the way the Linux kernel's IPv6 implementation handled overlapping, fragmented IPv6 packets. A remote attacker could potentially use this flaw to bypass protection mechanisms (such as a firewall or intrusion detection system (IDS)) when sending network packets to a target system. (CVE-2012-4444, Low)

Red Hat would like to thank the Xen project for reporting CVE-2012-5515, and Antonios Atlasis working with Beyond Security's SecuriTeam Secure Disclosure program and Loganaden Velvindron of AFRINIC for reporting CVE-2012-4444.

This update also fixes several bugs. Space precludes documenting all of these changes in this advisory. Documentation for these changes will be available shortly from the Red Hat Enterprise Linux 5.9 Technical Notes document linked to in the References section.

Users should upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

XEN has been updated to fix various bugs and security issues :

  - (XSA 36) To avoid an erratum in early hardware, the Xen     AMD IOMMU code by default choose to use a single     interrupt remapping table for the whole system. This     sharing implied that any guest with a passed through PCI     device that is bus mastering capable can inject     interrupts into other guests, including domain 0. This     has been disabled for AMD chipsets not capable of it.
    (CVE-2013-0153)

  - qemu: The e1000 had overflows under some conditions,     potentially corrupting memory. (CVE-2012-6075)

  - (XSA 37) Hypervisor crash due to incorrect ASSERT (debug     build only). (CVE-2013-0154)

  - (XSA-33) A VT-d interrupt remapping source validation     flaw was fixed. Also the following bugs have been fixed     :. (CVE-2012-5634)

  - xen hot plug attach/detach fails. (bnc#805094)

  - domain locking can prevent a live migration from     completing. (bnc#802690)

  - no way to control live migrations. (bnc#797014)

  - fix logic error in stdiostream_progress

  - restore logging in xc_save

  - add options to control migration tunables

  - enabling xentrace crashes hypervisor. (bnc#806736)

  - Upstream patches from Jan     26287-sched-credit-pick-idle.patch     26501-VMX-simplify-CR0-update.patch     26502-VMX-disable-SMEP-when-not-paging.patch     26516-ACPI-parse-table-retval.patch (Replaces     CVE-2013-0153-xsa36.patch)     26517-AMD-IOMMU-clear-irtes.patch (Replaces     CVE-2013-0153-xsa36.patch)     26518-AMD-IOMMU-disable-if-SATA-combined-mode.patch     (Replaces CVE-2013-0153-xsa36.patch)     26519-AMD-IOMMU-perdev-intremap-default.patch (Replaces     CVE-2013-0153-xsa36.patch) 26526-pvdrv-no-devinit.patch     26531-AMD-IOMMU-IVHD-special-missing.patch (Replaces     CVE-2013-0153-xsa36.patch)

  - Add $network to xend initscript dependencies.
    (bnc#798188)

  - Unable to dvd or cdrom-boot DomU after xen-tools update     Fixed with update to Xen version 4.1.4. (bnc#799694)

  - L3: HP iLo Generate NMI function not working in XEN     kernel. (bnc#800156)

  - Upstream patches from Jan     26404-x86-forward-both-NMI-kinds.patch     26427-x86-AMD-enable-WC+.patch

  - Xen VMs with more than 2 disks randomly fail to start.
    (bnc#793927)

  - Upstream patches from Jan     26332-x86-compat-show-guest-stack-mfn.patch     26333-x86-get_page_type-assert.patch (Replaces     CVE-2013-0154-xsa37.patch)     26340-VT-d-intremap-verify-legacy-bridge.patch (Replaces     CVE-2012-5634-xsa33.patch)     26370-libxc-x86-initial-mapping-fit.patch

  - Update to Xen 4.1.4 c/s 23432

  - Update xenpaging.guest-memusage.patch add rule for     xenmem to avoid spurious build failures

  - Upstream patches from Jan 26179-PCI-find-next-cap.patch     26183-x86-HPET-masking.patch     26188-x86-time-scale-asm.patch     26200-IOMMU-debug-verbose.patch     26203-x86-HAP-dirty-vram-leak.patch     26229-gnttab-version-switch.patch (Replaces     CVE-2012-5510-xsa26.patch)     26230-x86-HVM-limit-batches.patch (Replaces     CVE-2012-5511-xsa27.patch)     26231-memory-exchange-checks.patch (Replaces     CVE-2012-5513-xsa29.patch)     26232-x86-mark-PoD-error-path.patch (Replaces     CVE-2012-5514-xsa30.patch)     26233-memop-order-checks.patch (Replaces     CVE-2012-5515-xsa31.patch)     26235-IOMMU-ATS-max-queue-depth.patch     26272-x86-EFI-makefile-cflags-filter.patch     26294-x86-AMD-Fam15-way-access-filter.patch     CVE-2013-0154-xsa37.patch

  - Restore c/s 25751 in 23614-x86_64-EFI-boot.patch. Modify     the EFI Makefile to do additional filtering.

This update fixes the following security issues in xen :

  - Grant table version switch list corruption vulnerability     (XSA-26). (CVE-2012-5510)

  - Several HVM operations do not validate the range of     their inputs (XSA-27). (CVE-2012-5511)

  - HVMOP_get_mem_access crash / HVMOP_set_mem_access     information leak (XSA-28). (CVE-2012-5512)

  - XENMEM_exchange may overwrite hypervisor memory     (XSA-29). (CVE-2012-5513)

  - Missing unlock in     guest_physmap_mark_populate_on_demand() (XSA-30).
    (CVE-2012-5514)

  - Several memory hypercall operations allow invalid extent     order values (XSA-31) Also the following bugs have been     fixed and upstream patches have been applied:.
    (CVE-2012-5515)

  - FATAL PAGE FAULT in hypervisor (arch_do_domctl)

  - 25931-x86-domctl-iomem-mapping-checks.patch

  - 26132-tmem-save-NULL-check.patch

  - 26134-x86-shadow-invlpg-check.patch

  - 26148-vcpu-timer-overflow.patch (Replaces     CVE-2012-4535-xsa20.patch)

  - 26149-x86-p2m-physmap-error-path.patch (Replaces     CVE-2012-4537-xsa22.patch)

  - 26150-x86-shadow-unhook-toplevel-check.patch (Replaces     CVE-2012-4538-xsa23.patch)

  - 26151-gnttab-compat-get-status-frames.patch (Replaces     CVE-2012-4539-xsa24.patch)

  - efi files missing in latest XEN update. (bnc#792476)

This update fixes the following security issues :

  - It was found that the Xen hypervisor implementation did     not perform range checking on the guest provided values     in multiple hypercalls. A privileged guest user could     use this flaw to trigger long loops, leading to a denial     of service (Xen hypervisor hang). (CVE-2012-5515,     Moderate)

  - It was found that when running a 32-bit binary that uses     a large number of shared libraries, one of the libraries     would always be loaded at a predictable address in     memory. An attacker could use this flaw to bypass the     Address Space Layout Randomization (ASLR) security     feature. (CVE-2012-1568, Low)

  - A flaw was found in the way the Linux kernel's IPv6     implementation handled overlapping, fragmented IPv6     packets. A remote attacker could potentially use this     flaw to bypass protection mechanisms (such as a firewall     or intrusion detection system (IDS)) when sending     network packets to a target system. (CVE-2012-4444, Low)

The system must be rebooted for this update to take effect.

Updated kernel packages that fix three security issues and several bugs are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

This update fixes the following security issues :

* It was found that the Xen hypervisor implementation did not perform range checking on the guest provided values in multiple hypercalls. A privileged guest user could use this flaw to trigger long loops, leading to a denial of service (Xen hypervisor hang). (CVE-2012-5515, Moderate)

* It was found that when running a 32-bit binary that uses a large number of shared libraries, one of the libraries would always be loaded at a predictable address in memory. An attacker could use this flaw to bypass the Address Space Layout Randomization (ASLR) security feature. (CVE-2012-1568, Low)

* A flaw was found in the way the Linux kernel's IPv6 implementation handled overlapping, fragmented IPv6 packets. A remote attacker could potentially use this flaw to bypass protection mechanisms (such as a firewall or intrusion detection system (IDS)) when sending network packets to a target system. (CVE-2012-4444, Low)

Red Hat would like to thank the Xen project for reporting CVE-2012-5515, and Antonios Atlasis working with Beyond Security's SecuriTeam Secure Disclosure program and Loganaden Velvindron of AFRINIC for reporting CVE-2012-4444.

This update also fixes several bugs. Space precludes documenting all of these changes in this advisory. Documentation for these changes will be available shortly from the Red Hat Enterprise Linux 5.9 Technical Notes document linked to in the References section.

Users should upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

A guest can cause xen to crash [XSA-26, CVE-2012-5510] (#883082) An HVM guest can cause xen to run slowly or crash [XSA-27, CVE-2012-5511] (#883084) An HVM guest can cause xen to crash or leak information [XSA-28, CVE-2012-5512] (#883085) A PV guest can cause xen to crash and might be able escalate privileges [XSA-29, CVE-2012-5513] (#883088) An HVM guest can cause xen to hang [XSA-30, CVE-2012-5514] (#883091) A guest can cause xen to hang [XSA-31, CVE-2012-5515] (#883092)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Multiple denial of service vulnerabilities have been discovered in the Xen Hypervisor. One of the issue (CVE-2012-5513 ) could even lead to privilege escalation from guest to host.

Some of the recently published Xen Security Advisories ( XSA 25and 28) are not fixed by this update and should be fixed in a future release.

  - CVE-2011-3131 ( XSA 5): DoS using I/OMMU faults from     PCI-passthrough guest     A VM that controls a PCI[E] device directly can cause it     to issue DMA requests to invalid addresses. Although     these requests are denied by the I/OMMU, the hypervisor     needs to handle the interrupt and clear the error from     the I/OMMU, and this can be used to live-lock a CPU and     potentially hang the host.

  - CVE-2012-4535 ( XSA 20): Timer overflow DoS     vulnerability

    A guest which sets a VCPU with an inappropriate deadline     can cause an infinite loop in Xen, blocking the affected     physical CPU indefinitely.

  - CVE-2012-4537 ( XSA 22): Memory mapping failure DoS     vulnerability

    When set_p2m_entry fails, Xen's internal data structures     (the p2m and m2p tables) can get out of sync. This     failure can be triggered by unusual guest behaviour     exhausting the memory reserved for the p2m table. If it     happens, subsequent guest-invoked memory operations can     cause Xen to fail an assertion and crash.

  - CVE-2012-4538 ( XSA 23): Unhooking empty PAE entries DoS     vulnerability

    The HVMOP_pagetable_dying hypercall does not correctly     check the caller's pagetable state, leading to a     hypervisor crash.

  - CVE-2012-4539 ( XSA 24): Grant table hypercall infinite     loop DoS vulnerability

    Due to inappropriate duplicate use of the same loop     control variable, passing bad arguments to     GNTTABOP_get_status_frames can cause an infinite loop in     the compat hypercall handler.

  - CVE-2012-5510 ( XSA 26): Grant table version switch list     corruption vulnerability

    Downgrading the grant table version of a guest involves     freeing its status pages. This freeing was incomplete -     the page(s) are freed back to the allocator, but not     removed from the domain's tracking list. This would     cause list corruption, eventually leading to a     hypervisor crash.

  - CVE-2012-5513 ( XSA 29): XENMEM_exchange may overwrite     hypervisor memory

    The handler for XENMEM_exchange accesses guest memory     without range checking the guest provided addresses,     thus allowing these accesses to include the hypervisor     reserved range.

  A malicious guest administrator can cause Xen to crash. If the out   of address space bounds access does not lead to a crash, a carefully   crafted privilege escalation cannot be excluded, even though the   guest doesn't itself control the values written.

  - CVE-2012-5514 ( XSA 30): Broken error handling in     guest_physmap_mark_populate_on_demand()

    guest_physmap_mark_populate_on_demand(), before carrying     out its actual operation, checks that the subject GFNs     are not in use. If that check fails, the code prints a     message and bypasses the gfn_unlock() matching the     gfn_lock() carried out before entering the loop. A     malicious guest administrator can then use it to cause     Xen to hang.

  - CVE-2012-5515 ( XSA 31): Several memory hypercall     operations allow invalid extent order values

    Allowing arbitrary extent_order input values for     XENMEM_decrease_reservation, XENMEM_populate_physmap,     and XENMEM_exchange can cause arbitrarily long time     being spent in loops without allowing vital other code     to get a chance to execute. This may also cause     inconsistent state resulting at the completion of these     hypercalls.

This update fixes the following security issues in xen :

  - XENMEM_exchange may overwrite hypervisor memory     (XSA-29). (CVE-2012-5513)

  - Several memory hypercall operations allow invalid extent     order values (XSA-31). (CVE-2012-5515)

Also the following bugs have been fixed and upstream patches have been applied: 26134-x86-shadow-invlpg-check.patch

The remote CentOS system is missing a security update which has been documented in Red Hat advisory RHSA-2013-0168.

ID	Name	Product	Family	Severity
84140	OracleVM 3.2 : xen (OVMSA-2015-0068) (POODLE) (Venom)	Nessus	OracleVM Local Security Checks	low
83617	SUSE SLES10 Security Update : Xen (SUSE-SU-2014:0470-1)	Nessus	SuSE Local Security Checks	medium
83616	SUSE SLES11 Security Update : Xen (SUSE-SU-2014:0446-1)	Nessus	SuSE Local Security Checks	high
83569	SUSE SLED10 / SLES10 Security Update : Xen (SUSE-SU-2012:1606-1)	Nessus	SuSE Local Security Checks	medium
79492	OracleVM 2.2 : xen (OVMSA-2012-0058)	Nessus	OracleVM Local Security Checks	medium
79491	OracleVM 3.1 : xen (OVMSA-2012-0057)	Nessus	OracleVM Local Security Checks	medium
79490	OracleVM 3.0 : xen (OVMSA-2012-0056)	Nessus	OracleVM Local Security Checks	medium
74967	openSUSE Security Update : xen (openSUSE-SU-2013:0637-1)	Nessus	SuSE Local Security Checks	high
74966	openSUSE Security Update : xen (openSUSE-SU-2013:0636-1)	Nessus	SuSE Local Security Checks	high
74852	openSUSE Security Update : xen (openSUSE-SU-2012:1685-1)	Nessus	SuSE Local Security Checks	medium
74850	openSUSE Security Update : xen (openSUSE-SU-2012:1687-1)	Nessus	SuSE Local Security Checks	medium
70184	GLSA-201309-24 : Xen: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
68711	Oracle Linux 5 : kernel (ELSA-2013-0168)	Nessus	Oracle Linux Local Security Checks	medium
68710	Oracle Linux 5 : kernel (ELSA-2013-0168-1)	Nessus	Oracle Linux Local Security Checks	medium
65797	SuSE 11.2 Security Update : Xen (SAT Patch Number 7492)	Nessus	SuSE Local Security Checks	high
64232	SuSE 11.2 Security Update : Xen (SAT Patch Number 7133)	Nessus	SuSE Local Security Checks	medium
63677	Scientific Linux Security Update : kernel on SL5.x i386/x86_64 (20130122)	Nessus	Scientific Linux Local Security Checks	medium
63670	CentOS 5 : kernel (CESA-2013:0168)	Nessus	CentOS Local Security Checks	medium
63662	RHEL 5 : kernel (RHSA-2013:0168)	Nessus	Red Hat Local Security Checks	medium
63275	Fedora 16 : xen-4.1.3-6.fc16 (2012-19828)	Nessus	Fedora Local Security Checks	medium
63252	Fedora 17 : xen-4.1.3-7.fc17 (2012-19717)	Nessus	Fedora Local Security Checks	medium
63188	Debian DSA-2582-1 : xen - several vulnerabilities	Nessus	Debian Local Security Checks	medium
63153	SuSE 10 Security Update : Xen (ZYPP Patch Number 8379)	Nessus	SuSE Local Security Checks	medium
801533	CentOS RHSA-2013-0168 Security Check	Log Correlation Engine	Generic	high

Detections

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CVE-2012-5515

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