Ubuntu 3161-3: Linux kernel (Raspberry Pi 2) vulnerabilities

    Date20 Dec 2016
    CategoryUbuntu
    59
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3161-3
    December 20, 2016
    
    linux-raspi2 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    
    Details:
    
    Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the
    TTY implementation in the Linux kernel. A local attacker could use this to
    expose sensitive information (kernel memory). (CVE-2015-8964)
    
    It was discovered that the Video For Linux Two (v4l2) implementation in the
    Linux kernel did not properly handle multiple planes when processing a
    VIDIOC_DQBUF ioctl(). A local attacker could use this to cause a denial of
    service (system crash) or possibly execute arbitrary code. (CVE-2016-4568)
    
    CAI Qian discovered that shared bind mounts in a mount namespace
    exponentially added entries without restriction to the Linux kernel's mount
    table. A local attacker could use this to cause a denial of service (system
    crash). (CVE-2016-6213)
    
    Ondrej Kozina discovered that the keyring interface in the Linux kernel
    contained a buffer overflow when displaying timeout events via the
    /proc/keys interface. A local attacker could use this to cause a denial of
    service (system crash). (CVE-2016-7042)
    
    Andreas Gruenbacher and Jan Kara discovered that the filesystem
    implementation in the Linux kernel did not clear the setgid bit during a
    setxattr call. A local attacker could use this to possibly elevate group
    privileges. (CVE-2016-7097)
    
    Marco Grassi discovered that the driver for Areca RAID Controllers in the
    Linux kernel did not properly validate control messages. A local attacker
    could use this to cause a denial of service (system crash) or possibly gain
    privileges. (CVE-2016-7425)
    
    It was discovered that the KVM implementation for x86/x86_64 in the Linux
    kernel could dereference a null pointer. An attacker in a guest virtual
    machine could use this to cause a denial of service (system crash) in the
    KVM host. (CVE-2016-8630)
    
    Eyal Itkin discovered that the IP over IEEE 1394 (FireWire) implementation
    in the Linux kernel contained a buffer overflow when handling fragmented
    packets. A remote attacker could use this to possibly execute arbitrary
    code with administrative privileges. (CVE-2016-8633)
    
    Marco Grassi discovered that the TCP implementation in the Linux kernel
    mishandles socket buffer (skb) truncation. A local attacker could use this
    to cause a denial of service (system crash). (CVE-2016-8645)
    
    Daxing Guo discovered a stack-based buffer overflow in the Broadcom
    IEEE802.11n FullMAC driver in the Linux kernel. A local attacker could use
    this to cause a denial of service (system crash) or possibly gain
    privileges. (CVE-2016-8658)
    
    It was discovered that an information leak existed in __get_user_asm_ex()
    in the Linux kernel. A local attacker could use this to expose sensitive
    information. (CVE-2016-9178)
    
    Andrey Konovalov discovered that the SCTP implementation in the Linux
    kernel improperly handled validation of incoming data. A remote attacker
    could use this to cause a denial of service (system crash). (CVE-2016-9555)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1038-raspi2   4.4.0-1038.45
      linux-image-raspi2              4.4.0.1038.37
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    ATTENTION: Due to an unavoidable ABI change the kernel updates have
    been given a new version number, which requires you to recompile and
    reinstall all third party kernel modules you might have installed.
    Unless you manually uninstalled the standard kernel metapackages
    (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
    linux-powerpc), a standard system upgrade will automatically perform
    this as well.
    
    References:
      http://www.ubuntu.com/usn/usn-3161-3
      http://www.ubuntu.com/usn/usn-3161-1
      CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-7042,
      CVE-2016-7097, CVE-2016-7425, CVE-2016-8630, CVE-2016-8633,
      CVE-2016-8645, CVE-2016-8658, CVE-2016-9178, CVE-2016-9555
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1038.45
    
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