Security update for xen

SUSE Security Update: Security update for xen
Announcement ID: SUSE-SU-2018:0638-1
Rating: important
References: #1027519 #1031382 #1035442 #1061081 #1068032 #1070158 #1070159 #1070160 #1070163 #1074562 #1076116 #1076180 #1080635 #1080662
Affected Products:
  • SUSE Linux Enterprise Software Development Kit 11-SP4
  • SUSE Linux Enterprise Server 11-SP4
  • SUSE Linux Enterprise Debuginfo 11-SP4

  • An update that solves 10 vulnerabilities and has four fixes is now available.

    Description:

    This update for xen fixes several issues.

    This new feature was included:

    - add script and sysv service to watch for vcpu online/offline events in a
    HVM domU

    These security issues were fixed:

    - CVE-2017-5753, CVE-2017-5715, CVE-2017-5754: Prevent information leaks
    via side effects of speculative execution, aka "Spectre" and "Meltdown"
    attacks (bsc#1074562, bsc#1068032)
    - CVE-2018-5683: The vga_draw_text function allowed local OS guest
    privileged users to cause a denial of service (out-of-bounds read and
    QEMU process crash) by leveraging improper memory address validation
    (bsc#1076116).
    - CVE-2017-18030: The cirrus_invalidate_region function allowed local OS
    guest privileged users to cause a denial of service (out-of-bounds array
    access and QEMU process crash) via vectors related to negative pitch
    (bsc#1076180).
    - CVE-2017-15595: x86 PV guest OS users were able to cause a DoS
    (unbounded recursion, stack consumption, and hypervisor crash) or
    possibly gain privileges via crafted page-table stacking (bsc#1061081)
    - CVE-2017-17566: Prevent PV guest OS users to cause a denial of service
    (host OS crash) or gain host OS privileges in shadow mode by mapping a
    certain auxiliary page (bsc#1070158).
    - CVE-2017-17563: Prevent guest OS users to cause a denial of service
    (host OS crash) or gain host OS privileges by leveraging an incorrect
    mask for reference-count overflow checking in shadow mode (bsc#1070159).
    - CVE-2017-17564: Prevent guest OS users to cause a denial of service
    (host OS crash) or gain host OS privileges by leveraging incorrect error
    handling for reference counting in shadow mode (bsc#1070160).
    - CVE-2017-17565: Prevent PV guest OS users to cause a denial of service
    (host OS crash) if shadow mode and log-dirty mode are in place, because
    of an incorrect assertion related to M2P (bsc#1070163).
    - Added missing intermediate preemption checks for guest requesting
    removal of memory. This allowed malicious guest administrator to cause
    denial of service due to the high cost of this operation (bsc#1080635).
    - Because of XEN not returning the proper error messages when
    transitioning grant tables from v2 to v1 a malicious guest was able to
    cause DoS or potentially allowed for privilege escalation as well as
    information leaks (bsc#1080662).

    These non-security issues were fixed:

    - bsc#1035442: Increased the value of LIBXL_DESTROY_TIMEOUT from 10 to 100
    seconds. If many domUs shutdown in parallel the backends couldn't keep up
    - bsc#1031382: Prevent VMs from crashing when migrating between dom0 hosts
    in case read() returns zero on the receiver side.

    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 Software Development Kit 11-SP4:
      zypper in -t patch sdksp4-xen-13501=1
    • SUSE Linux Enterprise Server 11-SP4:
      zypper in -t patch slessp4-xen-13501=1
    • SUSE Linux Enterprise Debuginfo 11-SP4:
      zypper in -t patch dbgsp4-xen-13501=1

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

    Package List:

    • SUSE Linux Enterprise Software Development Kit 11-SP4 (i586 x86_64):
      • xen-devel-4.4.4_28-61.23.2
    • SUSE Linux Enterprise Server 11-SP4 (i586 x86_64):
      • xen-kmp-default-4.4.4_28_3.0.101_108.35-61.23.2
      • xen-libs-4.4.4_28-61.23.2
      • xen-tools-domU-4.4.4_28-61.23.2
    • SUSE Linux Enterprise Server 11-SP4 (x86_64):
      • xen-4.4.4_28-61.23.2
      • xen-doc-html-4.4.4_28-61.23.2
      • xen-libs-32bit-4.4.4_28-61.23.2
      • xen-tools-4.4.4_28-61.23.2
    • SUSE Linux Enterprise Server 11-SP4 (i586):
      • xen-kmp-pae-4.4.4_28_3.0.101_108.35-61.23.2
    • SUSE Linux Enterprise Debuginfo 11-SP4 (i586 x86_64):
      • xen-debuginfo-4.4.4_28-61.23.2
      • xen-debugsource-4.4.4_28-61.23.2

    References: