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.

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.

The SUSE Linux Enterprise Server 10 Service Pack 4 LTSS Xen hypervisor and toolset have been updated to fix various security issues.

The following security issues have been addressed :

  - 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-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-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-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-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-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-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)

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.

XEN has been updated to version 4.2.3 c/s 26170, fixing various bugs and security issues.

  - CVE-2013-4416: XSA-72: Fixed ocaml xenstored that     mishandled oversized message replies

  - CVE-2013-4355: XSA-63: Fixed information leaks through     I/O instruction emulation

  - CVE-2013-4361: XSA-66: Fixed information leak through     fbld instruction emulation

  - CVE-2013-4368: XSA-67: Fixed information leak through     outs instruction emulation

  - CVE-2013-4369: XSA-68: Fixed possible null dereference     when parsing vif ratelimiting info

  - CVE-2013-4370: XSA-69: Fixed misplaced free in ocaml     xc_vcpu_getaffinity stub

  - CVE-2013-4371: XSA-70: Fixed use-after-free in     libxl_list_cpupool under memory pressure

  - CVE-2013-4375: XSA-71: xen: qemu disk backend (qdisk)     resource leak

  - CVE-2013-1442: XSA-62: Fixed information leak on AVX     and/or LWP capable CPUs

  - CVE-2013-1432: XSA-58: Page reference counting error due     to XSA-45/CVE-2013-1918 fixes.

Various bugs have also been fixed :

  - Boot failure with xen kernel in UEFI mode with error 'No     memory for trampoline' (bnc#833483)

  - Improvements to block-dmmd script (bnc#828623)

  - MTU size on Dom0 gets reset when booting DomU with e1000     device (bnc#840196)

  - In HP's UEFI x86_64 platform and with xen environment,     in booting stage, xen hypervisor will panic.
    (bnc#833251)

  - Xen: migration broken from xsave-capable to     xsave-incapable host (bnc#833796)

  - In xen, 'shutdown -y 0 -h' cannot power off system     (bnc#834751)

  - In HP's UEFI x86_64 platform with xen environment, xen     hypervisor will panic on multiple blades nPar.
    (bnc#839600)

  - vcpus not started after upgrading Dom0 from SLES 11 SP2     to SP3 (bnc#835896)

  - SLES 11 SP3 Xen security patch does not automatically     update UEFI boot binary (bnc#836239)

  - Failed to setup devices for vm instance when start     multiple vms simultaneously (bnc#824676)

  - SLES 9 SP4 guest fails to start after upgrading to SLES     11 SP3 (bnc#817799)

  - Various upstream fixes have been included.

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 :

  - x86: check segment descriptor read result in 64-bit OUTS     emulation XSA-67 (Matthew Daley) [orabug 17571623]     (CVE-2013-4368)

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

  - x86: check segment descriptor read result in 64-bit OUTS     emulation XSA-67 (Matthew Daley) [orabug 17571640]     (CVE-2013-4368)

  - x86: properly set up fbld emulation operand address     XSA-66 (Jan Beulich) [orabug 17472492] (CVE-2013-4361)

  - x86: properly handle hvm_copy_from_guest_[phys,virt]     errors XSA-63 (Jan Beulich) [orabug 17472461]     (CVE-2013-4355)

  - libxc: builder: limit maximum size of kernel/ramdisk     (Ian Campbell) [orabug 15852491] (CVE-2012-4544)

  - libxc: builder: Correct fix for CVE-2012-4544 (Ian     Campbell) [orabug 15852491] (CVE-2012-4544)

  - [PATCH 01/21] libelf: abolish libelf-relocate.c (Ian     Jackson) [orabug 16902308] (CVE-2013-2194 CVE-2013-2195     CVE-2013-2196)

  - [PATCH 02/21] libxc: introduce xc_dom_seg_to_ptr_pages     (Ian Jackson) [orabug 16902308] (CVE-2013-2194     CVE-2013-2195 CVE-2013-2196)

  - [PATCH 03/21] libxc: Fix range checking in     xc_dom_pfn_to_ptr etc. (Ian Jackson) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - [PATCH 04/21] libelf: abolish elf_sval and     elf_access_signed (Ian Jackson) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - [PATCH 05/21] libelf/xc_dom_load_elf_symtab: Do not use     'syms' uninitialised (Ian Jackson) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - [PATCH 06/21] libelf: introduce macros for memory access     and pointer handling (Ian Jackson) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - [PATCH 07/21] tools/xcutils/readnotes: adjust     print_l1_mfn_valid_note (Ian Jackson) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - [PATCH 08/21] libelf: check nul-terminated strings     properly (Ian Jackson) [orabug 16902308] (CVE-2013-2194     CVE-2013-2195 CVE-2013-2196)

  - [PATCH 09/21] libelf: check all pointer accesses (Ian     Jackson) [orabug 16902308] (CVE-2013-2194 CVE-2013-2195     CVE-2013-2196)

  - [PATCH 10/21] libelf: Check pointer references in     elf_is_elfbinary (Ian Jackson) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - [PATCH 11/21] libelf: Make all callers call     elf_check_broken (Ian Jackson) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - [PATCH 12/21] libelf: use C99 bool for booleans (Ian     Jackson) [orabug 16902308] (CVE-2013-2194 CVE-2013-2195     CVE-2013-2196)

  - [PATCH 13/21] libelf: use only unsigned integers (Ian     Jackson) [orabug 16902308] (CVE-2013-2194 CVE-2013-2195     CVE-2013-2196)

  - [PATCH 14/21] libxc: Introduce xc_bitops.h (Ian Jackson)     [orabug 16902308] (CVE-2013-2194 CVE-2013-2195     CVE-2013-2196)

  - [PATCH 15/21] libelf: check loops for running away (Ian     Jackson) [orabug 16902308] (CVE-2013-2194 CVE-2013-2195     CVE-2013-2196)

  - [PATCH 16/21] libelf: abolish obsolete macros (Ian     Jackson) [orabug 16902308] (CVE-2013-2194 CVE-2013-2195     CVE-2013-2196)

  - [PATCH 17/21] libxc: Add range checking to     xc_dom_binloader (Ian Jackson) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - [PATCH 18/21] libxc: check failure of xc_dom_*_to_ptr,     xc_map_foreign_range (Ian Jackson) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - [PATCH 19/21] libxc: check return values from malloc     (Ian Jackson) [orabug 16902308] (CVE-2013-2194     CVE-2013-2195 CVE-2013-2196)

  - [PATCH 20/21] libxc: range checks in xc_dom_p2m_host and
    _guest (Ian Jackson) [orabug 16902308] (CVE-2013-2194     CVE-2013-2195 CVE-2013-2196)

  - [PATCH 21/21] libxc: check blob size before proceeding     in xc_dom_check_gzip (Matthew Daley) [orabug 16902308]     (CVE-2013-2194 CVE-2013-2195 CVE-2013-2196)

  - libxc: define INVALID_MFN for the XSA-55 patchset (Chuck     Anderson) [orabug 16902308] (CVE-2013-2194 CVE-2013-2195     CVE-2013-2196)

  - fix page refcount handling in page table pin error path     (Andrew Cooper) [orabug 16949882] (CVE-2013-1432)

  - remove CVE-2013-1919 (Chuck Anderson) [orabug 16635741]     (CVE-2013-1919)

  - x86: make vcpu_destroy_pagetables preemptible (Jan     Beulich) [orabug 16714903] (CVE-2013-1918)

  - x86: make new_guest_cr3 preemptible (Jan Beulich)     [orabug 16714903] (CVE-2013-1918)

  - x86: make MMUEXT_NEW_USER_BASEPTR preemptible (Jan     Beulich) [orabug 16714903] (CVE-2013-1918)

  - x86: make vcpu_reset preemptible (Jan Beulich) [orabug     16714903] (CVE-2013-1918)

  - x86: make arch_set_info_guest preemptible (Jan Beulich)     [orabug 16714903] (CVE-2013-1918)

  - x86: make page table unpinning preemptible (Jan Beulich)     [orabug 16714903] (CVE-2013-1918)

  - x86: make page table handling error paths preemptible     (Jan Beulich) [orabug 16714903] (CVE-2013-1918)

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

  - bug 17571611 (CVE-2013-4368)

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

  - x86: check segment descriptor read result in 64-bit OUTS     emulation When emulating such an operation from a 64-bit     context (CS has long mode set), and the data segment is     overridden to FS/GS, the result of reading the     overridden segment's descriptor (read_descriptor) is not     checked. If it fails, data_base is left uninitialized.
    This can lead to 8 bytes of Xen's stack being leaked to     the guest (implicitly, i.e. via the address given in a     #PF). Coverity-ID: 1055116 This is CVE-2013-4368 /     XSA-67.

    Fix formatting. (CVE-2013-4368)

Multiple security issues have been discovered in the Xen virtualisation solution which may result in information leaks or denial of service.

The remote host is affected by the vulnerability described in GLSA-201407-03 (Xen: Multiple Vunlerabilities)

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

    A remote attacker can utilize multiple vectors to execute arbitrary       code, cause Denial of Service, or gain access to data on the host.
  Workaround :

    There is no known workaround at this time.

Xen was updated to 4.1.6 c/s 23588 to fix various bugs and security issues.

Following changes are listed :

  - Comment out the -include directive in Config.mk as the     build service build seems to error out not finding     '.config' xen-config.diff

  - bnc#845520 - CVE-2013-4416: xen: ocaml xenstored     mishandles oversized message replies

  - Improvements to block-dmmd script bnc#828623

  - bnc#840196 - MTU size on Dom0 gets reset when booting     DomU with e1000 device

  - bnc#840592 - CVE-2013-4355: XSA-63: xen: Information     leaks through I/O instruction emulation

  - bnc#841766 - CVE-2013-4361: XSA-66: xen: Information     leak through fbld instruction emulation

  - bnc#842511 - CVE-2013-4368: XSA-67: xen: Information     leak through outs instruction emulation

  - xen/27397-ACPI-fix-acpi_os_map_memory.patch: address     regression

  - bnc#839596 - CVE-2013-1442: XSA-62: xen: Information     leak on AVX and/or LWP capable CPUs

  - bnc#833251 - In HP&rsquo;s UEFI x86_64 platform and with     xen environment, in booting stage ,xen hypervisor will     panic.

  - bnc#833796 - Xen: migration broken from xsave-capable to     xsave-incapable host

  - bnc#834751 - In xen, &ldquo;shutdown &ndash;y 0     &ndash;h&rdquo; cannot power off system

  - bnc#833251 - In HP&rsquo;s UEFI x86_64 platform and with     xen environment, in booting stage ,xen hypervisor will     panic.

  - bnc#839600 - In HP&rsquo;s UEFI x86_64 platform and     sles11sp3 with xen environment, xen hypervisor will     panic on multiple blades nPar.

Xen was updated to 4.2.3 c/s 26170 to fix various bugs and security issues.

Following issues were fixed :

  - bnc#845520 - CVE-2013-4416: xen: ocaml xenstored     mishandles oversized message replies

  - bnc#833483 - Boot Failure with xen kernel in UEFI mode     with error 'No memory for trampoline'

  - Improvements to block-dmmd script bnc#828623

  - bnc#840196 - MTU size on Dom0 gets reset when booting     DomU with e1000 device

  - bnc#840592 - CVE-2013-4355: XSA-63: xen: Information     leaks through I/O instruction emulation

  - bnc#841766 - CVE-2013-4361: XSA-66: xen: Information     leak through fbld instruction emulation

  - bnc#842511 - CVE-2013-4368: XSA-67: xen: Information     leak through outs instruction emulation

  - bnc#842512 - CVE-2013-4369: XSA-68: xen: possible null     dereference when parsing vif ratelimiting info

  - bnc#842513 - CVE-2013-4370: XSA-69: xen: misplaced free     in ocaml xc_vcpu_getaffinity stub

  - bnc#842514 - CVE-2013-4371: XSA-70: xen: use-after-free     in libxl_list_cpupool under memory pressure

  - bnc#842515 - CVE-2013-4375: XSA-71: xen: qemu disk     backend (qdisk) resource leak

  - bnc#839596 - CVE-2013-1442: XSA-62: xen: Information     leak on AVX and/or LWP capable CPUs

  - bnc#833251 - [HP BCS SLES11 Bug]: In HP&rsquo;s UEFI     x86_64 platform and with xen environment, in booting     stage ,xen hypervisor will panic.

  - bnc#833796 - Xen: migration broken from xsave-capable to     xsave-incapable host

  - bnc#834751 - [HP BCS SLES11 Bug]: In xen,     &ldquo;shutdown &ndash;y 0 &ndash;h&rdquo; cannot power     off system

  - bnc#839600 - [HP BCS SLES11 Bug]: In HP&rsquo;s UEFI     x86_64 platform and sles11sp3 with xen environment, xen     hypervisor will panic on multiple blades nPar. 

  - bnc#833251 - [HP BCS SLES11 Bug]: In HP&rsquo;s UEFI     x86_64 platform and with xen environment, in booting     stage ,xen hypervisor will panic.

  - bnc#835896 - vcpus not started after upgrading Dom0 from     11SP2 to SP3

  - bnc#836239 - SLES 11 SP3 Xen security patch does not     automatically update UEFI boot binary

XEN has been updated to version 4.2.3 c/s 26170, fixing various bugs and security issues.

  - XSA-72: Fixed ocaml xenstored that mishandled oversized     message replies. (CVE-2013-4416)

  - XSA-63: Fixed information leaks through I/O instruction     emulation. (CVE-2013-4355)

  - XSA-66: Fixed information leak through fbld instruction     emulation. (CVE-2013-4361)

  - XSA-67: Fixed information leak through outs instruction     emulation. (CVE-2013-4368)

  - XSA-68: Fixed possible null dereference when parsing vif     ratelimiting info. (CVE-2013-4369)

  - XSA-69: Fixed misplaced free in ocaml     xc_vcpu_getaffinity stub. (CVE-2013-4370)

  - XSA-70: Fixed use-after-free in libxl_list_cpupool under     memory pressure. (CVE-2013-4371)

  - XSA-71: xen: qemu disk backend (qdisk) resource leak.
    (CVE-2013-4375)

  - XSA-62: Fixed information leak on AVX and/or LWP capable     CPUs. (CVE-2013-1442)

  - XSA-58: Page reference counting error due to     XSA-45/CVE-2013-1918 fixes. Various bugs have also been     fixed:. (CVE-2013-1432)

  - Boot failure with xen kernel in UEFI mode with error 'No     memory for trampoline'. (bnc#833483)

  - Improvements to block-dmmd script. (bnc#828623)

  - MTU size on Dom0 gets reset when booting DomU with e1000     device. (bnc#840196)

  - In HP's UEFI x86_64 platform and with xen environment,     in booting stage, xen hypervisor will panic.
    (bnc#833251)

  - Xen: migration broken from xsave-capable to     xsave-incapable host. (bnc#833796)

  - In xen, 'shutdown -y 0 -h' cannot power off system.
    (bnc#834751)

  - In HP's UEFI x86_64 platform with xen environment, xen     hypervisor will panic on multiple blades nPar.
    (bnc#839600)

  - vcpus not started after upgrading Dom0 from SLES 11 SP2     to SP3. (bnc#835896)

  - SLES 11 SP3 Xen security patch does not automatically     update UEFI boot binary. (bnc#836239)

  - Failed to setup devices for vm instance when start     multiple vms simultaneously. (bnc#824676)

  - SLES 9 SP4 guest fails to start after upgrading to SLES     11 SP3. (bnc#817799)

  - Various upstream fixes have been included.

- A flaw was found in the way the Linux kernel handled the     creation of temporary IPv6 addresses. If the IPv6     privacy extension was enabled     (/proc/sys/net/ipv6/conf/eth0/use_tempaddr is set to     '2'), an attacker on the local network could disable     IPv6 temporary address generation, leading to a     potential information disclosure. (CVE-2013-0343,     Moderate)

  - An information leak flaw was found in the way Linux     kernel's device mapper subsystem, under certain     conditions, interpreted data written to snapshot block     devices. An attacker could use this flaw to read data     from disk blocks in free space, which are normally     inaccessible. (CVE-2013-4299, Moderate)

  - An off-by-one flaw was found in the way the ANSI CPRNG     implementation in the Linux kernel processed non-block     size aligned requests. This could lead to random numbers     being generated with less bits of entropy than expected     when ANSI CPRNG was used. (CVE-2013-4345, Moderate)

  - An information leak flaw was found in the way Xen     hypervisor emulated the OUTS instruction for 64-bit     paravirtualized guests. A privileged guest user could     use this flaw to leak hypervisor stack memory to the     guest. (CVE-2013-4368, Moderate)

This update also fixes the following bug :

  - A bug in the GFS2 code prevented glock work queues from     freeing glock- related memory while the glock memory     shrinker repeatedly queued a large number of demote     requests, for example when performing a simultaneous     backup of several live GFS2 volumes with a large file     count. As a consequence, the glock work queues became     overloaded which resulted in a high CPU usage and the     GFS2 file systems being unresponsive for a significant     amount of time. A patch has been applied to alleviate     this problem by calling the yield() function after     scheduling a certain amount of tasks on the glock work     queues. The problem can now occur only with extremely     high work loads.

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

From Red Hat Security Advisory 2013:1449 :

Updated kernel packages that fix multiple security issues and one bug 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.

* A flaw was found in the way the Linux kernel handled the creation of temporary IPv6 addresses. If the IPv6 privacy extension was enabled (/proc/sys/net/ipv6/conf/eth0/use_tempaddr is set to '2'), an attacker on the local network could disable IPv6 temporary address generation, leading to a potential information disclosure. (CVE-2013-0343, Moderate)

* An information leak flaw was found in the way Linux kernel's device mapper subsystem, under certain conditions, interpreted data written to snapshot block devices. An attacker could use this flaw to read data from disk blocks in free space, which are normally inaccessible.
(CVE-2013-4299, Moderate)

* An off-by-one flaw was found in the way the ANSI CPRNG implementation in the Linux kernel processed non-block size aligned requests. This could lead to random numbers being generated with less bits of entropy than expected when ANSI CPRNG was used.
(CVE-2013-4345, Moderate)

* An information leak flaw was found in the way Xen hypervisor emulated the OUTS instruction for 64-bit paravirtualized guests. A privileged guest user could use this flaw to leak hypervisor stack memory to the guest. (CVE-2013-4368, Moderate)

Red Hat would like to thank Fujitsu for reporting CVE-2013-4299, Stephan Mueller for reporting CVE-2013-4345, and the Xen project for reporting CVE-2013-4368.

This update also fixes the following bug :

* A bug in the GFS2 code prevented glock work queues from freeing glock-related memory while the glock memory shrinker repeatedly queued a large number of demote requests, for example when performing a simultaneous backup of several live GFS2 volumes with a large file count. As a consequence, the glock work queues became overloaded which resulted in a high CPU usage and the GFS2 file systems being unresponsive for a significant amount of time. A patch has been applied to alleviate this problem by calling the yield() function after scheduling a certain amount of tasks on the glock work queues.
The problem can now occur only with extremely high work loads.
(BZ#1014714)

All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

Updated kernel packages that fix multiple security issues and one bug 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.

* A flaw was found in the way the Linux kernel handled the creation of temporary IPv6 addresses. If the IPv6 privacy extension was enabled (/proc/sys/net/ipv6/conf/eth0/use_tempaddr is set to '2'), an attacker on the local network could disable IPv6 temporary address generation, leading to a potential information disclosure. (CVE-2013-0343, Moderate)

* An information leak flaw was found in the way Linux kernel's device mapper subsystem, under certain conditions, interpreted data written to snapshot block devices. An attacker could use this flaw to read data from disk blocks in free space, which are normally inaccessible.
(CVE-2013-4299, Moderate)

* An off-by-one flaw was found in the way the ANSI CPRNG implementation in the Linux kernel processed non-block size aligned requests. This could lead to random numbers being generated with less bits of entropy than expected when ANSI CPRNG was used.
(CVE-2013-4345, Moderate)

* An information leak flaw was found in the way Xen hypervisor emulated the OUTS instruction for 64-bit paravirtualized guests. A privileged guest user could use this flaw to leak hypervisor stack memory to the guest. (CVE-2013-4368, Moderate)

Red Hat would like to thank Fujitsu for reporting CVE-2013-4299, Stephan Mueller for reporting CVE-2013-4345, and the Xen project for reporting CVE-2013-4368.

This update also fixes the following bug :

* A bug in the GFS2 code prevented glock work queues from freeing glock-related memory while the glock memory shrinker repeatedly queued a large number of demote requests, for example when performing a simultaneous backup of several live GFS2 volumes with a large file count. As a consequence, the glock work queues became overloaded which resulted in a high CPU usage and the GFS2 file systems being unresponsive for a significant amount of time. A patch has been applied to alleviate this problem by calling the yield() function after scheduling a certain amount of tasks on the glock work queues.
The problem can now occur only with extremely high work loads.
(BZ#1014714)

All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

Five security fixes CVE-2013-4368 CVE-2013-4369 CVE-2013-4370 CVE-2013-4371 CVE-2013-4375

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.

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
83614	SUSE SLES10 Security Update : Xen (SUSE-SU-2014:0411-1)	Nessus	SuSE Local Security Checks	medium
83602	SUSE SLED11 / SLES11 Security Update : Xen (SUSE-SU-2013:1774-1)	Nessus	SuSE Local Security Checks	high
79522	OracleVM 2.2 : xen (OVMSA-2013-0075)	Nessus	OracleVM Local Security Checks	low
79521	OracleVM 2.2 : xen (OVMSA-2013-0074)	Nessus	OracleVM Local Security Checks	high
79520	OracleVM 3.1 : xen (OVMSA-2013-0073)	Nessus	OracleVM Local Security Checks	low
79519	OracleVM 3.2 : xen (OVMSA-2013-0072)	Nessus	OracleVM Local Security Checks	low
77240	Debian DSA-3006-1 : xen - security update	Nessus	Debian Local Security Checks	high
76544	GLSA-201407-03 : Xen: Multiple Vunlerabilities	Nessus	Gentoo Local Security Checks	high
75189	openSUSE Security Update : xen (openSUSE-SU-2013:1636-1)	Nessus	SuSE Local Security Checks	medium
74865	openSUSE Security Update : xen (openSUSE-SU-2013:1953-1)	Nessus	SuSE Local Security Checks	medium
70969	SuSE 11.2 / 11.3 Security Update : Xen (SAT Patch Numbers 8478 / 8479)	Nessus	SuSE Local Security Checks	high
70577	Scientific Linux Security Update : kernel on SL5.x i386/x86_64 (20131022)	Nessus	Scientific Linux Local Security Checks	medium
70575	Oracle Linux 5 : kernel (ELSA-2013-1449)	Nessus	Oracle Linux Local Security Checks	medium
70574	Oracle Linux 5 : kernel (ELSA-2013-1449-1)	Nessus	Oracle Linux Local Security Checks	medium
70570	CentOS 5 : kernel (CESA-2013:1449)	Nessus	CentOS Local Security Checks	medium
70553	RHEL 5 : kernel (RHSA-2013:1449)	Nessus	Red Hat Local Security Checks	medium
70550	Fedora 18 : xen-4.2.3-4.fc18 (2013-19053)	Nessus	Fedora Local Security Checks	medium
70549	Fedora 19 : xen-4.2.3-4.fc19 (2013-19048)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2013-4368

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Tenable Plugins

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