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

Updated kernel packages that fix multiple security issues, two bugs, and add two enhancements are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having important 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.

These packages contain the Linux kernel.

Security fixes :

* A race condition in the way asynchronous I/O and fallocate() interacted when using ext4 could allow a local, unprivileged user to obtain random data from a deleted file. (CVE-2012-4508, Important)

* A flaw in the way the Xen hypervisor implementation range checked guest provided addresses in the XENMEM_exchange hypercall could allow a malicious, para-virtualized guest administrator to crash the hypervisor or, potentially, escalate their privileges, allowing them to execute arbitrary code at the hypervisor level. (CVE-2012-5513, Important)

* A flaw in the Reliable Datagram Sockets (RDS) protocol implementation could allow a local, unprivileged user to cause a denial of service. (CVE-2012-2372, Moderate)

* A race condition in the way access to inet->opt ip_options was synchronized in the Linux kernel's TCP/IP protocol suite implementation. Depending on the network facing applications running on the system, a remote attacker could possibly trigger this flaw to cause a denial of service. A local, unprivileged user could use this flaw to cause a denial of service regardless of the applications the system runs. (CVE-2012-3552, Moderate)

* The Xen hypervisor implementation did not properly restrict the period values used to initialize per VCPU periodic timers. A privileged guest user could cause an infinite loop on the physical CPU. If the watchdog were enabled, it would detect said loop and panic the host system. (CVE-2012-4535, Moderate)

* A flaw in the way the Xen hypervisor implementation handled set_p2m_entry() error conditions could allow a privileged, fully-virtualized guest user to crash the hypervisor. (CVE-2012-4537, Moderate)

Red Hat would like to thank Theodore Ts'o for reporting CVE-2012-4508;
the Xen project for reporting CVE-2012-5513, CVE-2012-4535, and CVE-2012-4537; and Hafid Lin for reporting CVE-2012-3552. Upstream acknowledges Dmitry Monakhov as the original reporter of CVE-2012-4508. CVE-2012-2372 was discovered by Li Honggang of Red Hat.

Bug fixes :

* Previously, the interrupt handlers of the qla2xxx driver could clear pending interrupts right after the IRQ lines were attached during system start-up. Consequently, the kernel could miss the interrupt that reported completion of the link initialization, and the qla2xxx driver then failed to detect all attached LUNs. With this update, the qla2xxx driver has been modified to no longer clear interrupt bits after attaching the IRQ lines. The driver now correctly detects all attached LUNs as expected. (BZ#870118)

* The Ethernet channel bonding driver reported the MII (Media Independent Interface) status of the bond interface in 802.3ad mode as being up even though the MII status of all of the slave devices was down. This could pose a problem if the MII status of the bond interface was used to determine if failover should occur. With this update, the agg_device_up() function has been added to the bonding driver, which allows the driver to report the link status of the bond interface correctly, that is, down when all of its slaves are down, in the 802.3ad mode. (BZ#877943)

Enhancements :

* This update backports several changes from the latest upstream version of the bnx2x driver. The most important change, the remote-fault link detection feature, allows the driver to periodically scan the physical link layer for remote faults. If the physical link appears to be up and a fault is detected, the driver indicates that the link is down. When the fault is cleared, the driver indicates that the link is up again. (BZ#870120)

* The INET socket interface has been modified to send a warning message when the ip_options structure is allocated directly by a third-party module using the kmalloc() function. (BZ#874973)

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

Security fixes :

  - A race condition in the way asynchronous I/O and     fallocate() interacted when using ext4 could allow a     local, unprivileged user to obtain random data from a     deleted file. (CVE-2012-4508, Important)

  - A flaw in the way the Xen hypervisor implementation     range checked guest provided addresses in the     XENMEM_exchange hypercall could allow a malicious,     para-virtualized guest administrator to crash the     hypervisor or, potentially, escalate their privileges,     allowing them to execute arbitrary code at the     hypervisor level. (CVE-2012-5513, Important)

  - A flaw in the Reliable Datagram Sockets (RDS) protocol     implementation could allow a local, unprivileged user to     cause a denial of service. (CVE-2012-2372, Moderate)

  - A race condition in the way access to inet->opt     ip_options was synchronized in the Linux kernel's TCP/IP     protocol suite implementation. Depending on the network     facing applications running on the system, a remote     attacker could possibly trigger this flaw to cause a     denial of service. A local, unprivileged user could use     this flaw to cause a denial of service regardless of the     applications the system runs. (CVE-2012-3552, Moderate)

  - The Xen hypervisor implementation did not properly     restrict the period values used to initialize per VCPU     periodic timers. A privileged guest user could cause an     infinite loop on the physical CPU. If the watchdog were     enabled, it would detect said loop and panic the host     system. (CVE-2012-4535, Moderate)

  - A flaw in the way the Xen hypervisor implementation     handled set_p2m_entry() error conditions could allow a     privileged, fully-virtualized guest user to crash the     hypervisor. (CVE-2012-4537, Moderate)

Bug fixes :

  - Previously, the interrupt handlers of the qla2xxx driver     could clear pending interrupts right after the IRQ lines     were attached during system start-up. Consequently, the     kernel could miss the interrupt that reported completion     of the link initialization, and the qla2xxx driver then     failed to detect all attached LUNs. With this update,     the qla2xxx driver has been modified to no longer clear     interrupt bits after attaching the IRQ lines. The driver     now correctly detects all attached LUNs as expected.

  - The Ethernet channel bonding driver reported the MII     (Media Independent Interface) status of the bond     interface in 802.3ad mode as being up even though the     MII status of all of the slave devices was down. This     could pose a problem if the MII status of the bond     interface was used to determine if failover should     occur. With this update, the agg_device_up() function     has been added to the bonding driver, which allows the     driver to report the link status of the bond interface     correctly, that is, down when all of its slaves are     down, in the 802.3ad mode.

Enhancements :

  - This update backports several changes from the latest     upstream version of the bnx2x driver. The most important     change, the remote-fault link detection feature, allows     the driver to periodically scan the physical link layer     for remote faults. If the physical link appears to be up     and a fault is detected, the driver indicates that the     link is down. When the fault is cleared, the driver     indicates that the link is up again.

  - The INET socket interface has been modified to send a     warning message when the ip_options structure is     allocated directly by a third-party module using the     kmalloc() function.

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.

ID	Name	Product	Family	Published	Updated	Severity
74966	openSUSE Security Update : xen (openSUSE-SU-2013:0636-1)	Nessus	SuSE Local Security Checks	6/13/2014	1/19/2021	high
63171	CentOS 5 : kernel (CESA-2012:1540)	Nessus	CentOS Local Security Checks	12/7/2012	1/4/2021	medium
63183	Scientific Linux Security Update : kernel on SL5.x i386/x86_64 (20121204)	Nessus	Scientific Linux Local Security Checks	12/7/2012	1/14/2021	medium
63275	Fedora 16 : xen-4.1.3-6.fc16 (2012-19828)	Nessus	Fedora Local Security Checks	12/17/2012	1/11/2021	medium

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