Security update for xen

SUSE Security Update: Security update for xen
Announcement ID: SUSE-SU-2016:3067-1
Rating: important
References: #1000106 #1003030 #1003032 #1004981 #1005004 #1005005 #1007157 #1007941 #1009100 #1009103 #1009104 #1009105 #1009107 #1009108 #1009109 #1009111 #1011652
Affected Products:
  • SUSE Linux Enterprise Software Development Kit 12-SP2
  • SUSE Linux Enterprise Server 12-SP2
  • SUSE Linux Enterprise Desktop 12-SP2

  • An update that fixes 17 vulnerabilities is now available.

    Description:


    xen was updated to version 4.7.1 to fix 17 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-2016-9385: x86 segment base write emulation lacked canonical address
    checks, allowing a malicious guest administrator to crash the host
    (bsc#1009104).
    - CVE-2016-9384: Guest 32-bit ELF symbol table load leaking host data to
    unprivileged guest users (bsc#1009105).
    - 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-2016-9377: x86 software interrupt injection was mis-handled,
    allowing an unprivileged guest user to crash the guest (bsc#1009108).
    - CVE-2016-9378: x86 software interrupt injection was mis-handled,
    allowing an unprivileged guest user to crash the guest (bsc#1009108)
    - 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-2016-9379: Delimiter injection vulnerabilities in pygrub allowed
    guest administrators to obtain the contents of sensitive host files or
    delete the files (bsc#1009111).
    - CVE-2016-9380: Delimiter injection vulnerabilities in pygrub allowed
    guest administrators to obtain the contents of sensitive host files or
    delete the files (bsc#1009111).
    - CVE-2016-7777: 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).

    These non-security issues were fixed:

    - bsc#1004981: Xen RPM didn't contain debug hypervisor for EFI systems
    - bsc#1007941: Xen tools limited the number of vcpus to 256

    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 12-SP2:
      zypper in -t patch SUSE-SLE-SDK-12-SP2-2016-1785=1
    • SUSE Linux Enterprise Server 12-SP2:
      zypper in -t patch SUSE-SLE-SERVER-12-SP2-2016-1785=1
    • SUSE Linux Enterprise Desktop 12-SP2:
      zypper in -t patch SUSE-SLE-DESKTOP-12-SP2-2016-1785=1

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

    Package List:

    • SUSE Linux Enterprise Software Development Kit 12-SP2 (aarch64 x86_64):
      • xen-debugsource-4.7.1_02-25.1
      • xen-devel-4.7.1_02-25.1
    • SUSE Linux Enterprise Server 12-SP2 (x86_64):
      • xen-4.7.1_02-25.1
      • xen-debugsource-4.7.1_02-25.1
      • xen-doc-html-4.7.1_02-25.1
      • xen-libs-32bit-4.7.1_02-25.1
      • xen-libs-4.7.1_02-25.1
      • xen-libs-debuginfo-32bit-4.7.1_02-25.1
      • xen-libs-debuginfo-4.7.1_02-25.1
      • xen-tools-4.7.1_02-25.1
      • xen-tools-debuginfo-4.7.1_02-25.1
      • xen-tools-domU-4.7.1_02-25.1
      • xen-tools-domU-debuginfo-4.7.1_02-25.1
    • SUSE Linux Enterprise Desktop 12-SP2 (x86_64):
      • xen-4.7.1_02-25.1
      • xen-debugsource-4.7.1_02-25.1
      • xen-libs-32bit-4.7.1_02-25.1
      • xen-libs-4.7.1_02-25.1
      • xen-libs-debuginfo-32bit-4.7.1_02-25.1
      • xen-libs-debuginfo-4.7.1_02-25.1

    References: