Security update for Xen

SUSE Security Update: Security update for Xen
Announcement ID: SUSE-SU-2015:0746-1
Rating: moderate
References: #907755 #918995 #918998 #919464 #922705 #922706
Affected Products:
  • SUSE Linux Enterprise Server 11 SP2 LTSS
    		•

    An update that solves four vulnerabilities and has two fixes is now available.

    Description:

    The Virtualization service XEN was updated to fix various bugs and security issues.

    The following security issues have been fixed:

    • CVE-2015-2756: XSA-126: Unmediated PCI command register access in qemu could have lead to denial of service attacks against the host, if PCI cards are passed through to guests.

    • XSA-125: Long latency MMIO mapping operations were not preemptible.

    • CVE-2015-2151: XSA-123: Instructions with register operands ignored eventual segment overrides encoded for them. Due to an insufficiently conditional assignment such a bogus segment override could have, however, corrupted a pointer used subsequently to store the result of the instruction.

    • CVE-2015-2045: XSA-122: The code handling certain sub-operations of the HYPERVISOR_xen_version hypercall failed to fully initialize all fields of structures subsequently copied back to guest memory. Due to this hypervisor stack contents were copied into the destination of the operation, thus becoming visible to the guest.

    • CVE-2015-2044: XSA-121: Emulation routines in the hypervisor dealing with certain system devices checked whether the access size by the guest is a supported one. When the access size is unsupported these routines failed to set the data to be returned to the guest for read accesses, so that hypervisor stack contents were copied into the destination of the operation, thus becoming visible to the guest.

    Also fixed:

    • Regular crashes of dom-0 on different servers due to races in MCE access were fixed. bsc#907755

    Security Issues:

    Special Instructions and Notes:

    Please reboot the system after installing this update.

    Patch Instructions:

    To install this SUSE Security Update use YaST online_update.
    Alternatively you can run the command listed for your product:

    • SUSE Linux Enterprise Server 11 SP2 LTSS:
      zypper in -t patch slessp2-xen-201503=10561

    To bring your system up-to-date, use "zypper patch".

    Package List:

    • SUSE Linux Enterprise Server 11 SP2 LTSS (i586 x86_64):
      • xen-devel-4.1.6_08-0.9.1
      • xen-kmp-default-4.1.6_08_3.0.101_0.7.29-0.9.1
      • xen-kmp-trace-4.1.6_08_3.0.101_0.7.29-0.9.1
      • xen-libs-4.1.6_08-0.9.1
      • xen-tools-domU-4.1.6_08-0.9.1
    • SUSE Linux Enterprise Server 11 SP2 LTSS (x86_64):
      • xen-4.1.6_08-0.9.1
      • xen-doc-html-4.1.6_08-0.9.1
      • xen-doc-pdf-4.1.6_08-0.9.1
      • xen-libs-32bit-4.1.6_08-0.9.1
      • xen-tools-4.1.6_08-0.9.1
    • SUSE Linux Enterprise Server 11 SP2 LTSS (i586):
      • xen-kmp-pae-4.1.6_08_3.0.101_0.7.29-0.9.1

    References: