Security update for xen

SUSE Security Update: Security update for xen
Announcement ID: SUSE-SU-2016:3044-1
Rating: important
References: #1000106 #1000893 #1003030 #1003032 #1005004 #1005005 #1007157 #1009100 #1009103 #1009107 #1009109 #1009111 #1011652 #990843
Affected Products:
  • SUSE Linux Enterprise Server 11-SP2-LTSS
  • SUSE Linux Enterprise Debuginfo 11-SP2

  • An update that fixes 14 vulnerabilities is now available.

    Description:


    xen was updated to fix several security issues.

    These security issues were fixed:

    - CVE-2016-9637: ioport array overflow allowing a malicious guest
    administrator can escalate their privilege to that of the host
    (bsc#1011652).
    - CVE-2016-9386: x86 null segments were not always treated as unusable
    allowing an unprivileged guest user program to elevate its privilege to
    that of the guest operating system. Exploit of this vulnerability is
    easy on Intel and more complicated on AMD (bsc#1009100)
    - CVE-2016-9382: x86 task switch to VM86 mode was mis-handled, allowing a
    unprivileged guest process to escalate its privilege to that of the
    guest operating system on AMD hardware. On Intel hardware a malicious
    unprivileged guest process can crash the guest (bsc#1009103)
    - CVE-2016-9383: The x86 64-bit bit test instruction emulation was broken,
    allowing a guest to modify arbitrary memory leading to arbitray code
    execution (bsc#1009107)
    - CVE-2016-9381: Improper processing of shared rings allowing guest
    administrators take over the qemu process, elevating their privilege to
    that of the qemu process (bsc#1009109)
    - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed
    guest administrators to obtain the contents of sensitive host files or
    delete the files (bsc#1009111)
    - CVE-2016-9379: Delimiter injection vulnerabilities in pygrub allowed
    guest administrators to obtain the contents of sensitive host files or
    delete the files (bsc#1009111)
    - CVE-2016-7777: Xen did not properly honor CR0.TS and CR0.EM, which
    allowed local x86 HVM guest OS users to read or modify FPU, MMX, or XMM
    register state information belonging to arbitrary tasks on the guest by
    modifying an instruction while the hypervisor is preparing to emulate it
    (bsc#1000106)
    - CVE-2016-8910: The rtl8139_cplus_transmit function in hw/net/rtl8139.c
    allowed local guest OS administrators to cause a denial of service
    (infinite loop and CPU consumption) by leveraging failure to limit the
    ring descriptor count (bsc#1007157)
    - CVE-2016-8667: The rc4030_write function in hw/dma/rc4030.c in allowed
    local guest OS administrators to cause a denial of service
    (divide-by-zero error and QEMU process crash) via a large interval timer
    reload value (bsc#1005004)
    - CVE-2016-8669: The serial_update_parameters function in hw/char/serial.c
    allowed local guest OS administrators to cause a denial of service
    (divide-by-zero error and QEMU process crash) via vectors involving a
    value of divider greater than baud base (bsc#1005005)
    - CVE-2016-7908: The mcf_fec_do_tx function in hw/net/mcf_fec.c did not
    properly limit the buffer descriptor count when transmitting packets,
    which allowed local guest OS administrators to cause a denial of service
    (infinite loop and QEMU process crash) via vectors involving a buffer
    descriptor with a length of 0 and crafted values in bd.flags
    (bsc#1003030)
    - CVE-2016-7909: The pcnet_rdra_addr function in hw/net/pcnet.c allowed
    local guest OS administrators to cause a denial of service (infinite
    loop and QEMU process crash) by setting the (1) receive or (2) transmit
    descriptor ring length to 0 (bsc#1003032)
    - CVE-2016-6351: The esp_do_dma function in hw/scsi/esp.c, when built with
    ESP/NCR53C9x controller emulation support, allowed local guest OS
    administrators to cause a denial of service (out-of-bounds write and
    QEMU process crash) or execute arbitrary code on the host via vectors
    involving DMA read into ESP command buffer (bsc#990843)

    This non-security issue was fixed:

    - bsc#1000893: virsh setmem didn't allow to set current guest memory to
    max limit

    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-12874=1
    • SUSE Linux Enterprise Debuginfo 11-SP2:
      zypper in -t patch dbgsp2-xen-12874=1

    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_08-32.1
      • xen-kmp-default-4.1.6_08_3.0.101_0.7.44-32.1
      • xen-kmp-trace-4.1.6_08_3.0.101_0.7.44-32.1
      • xen-libs-4.1.6_08-32.1
      • xen-tools-domU-4.1.6_08-32.1
    • SUSE Linux Enterprise Server 11-SP2-LTSS (x86_64):
      • xen-4.1.6_08-32.1
      • xen-doc-html-4.1.6_08-32.1
      • xen-doc-pdf-4.1.6_08-32.1
      • xen-libs-32bit-4.1.6_08-32.1
      • xen-tools-4.1.6_08-32.1
    • SUSE Linux Enterprise Server 11-SP2-LTSS (i586):
      • xen-kmp-pae-4.1.6_08_3.0.101_0.7.44-32.1
    • SUSE Linux Enterprise Debuginfo 11-SP2 (i586 x86_64):
      • xen-debuginfo-4.1.6_08-32.1
      • xen-debugsource-4.1.6_08-32.1

    References: