Ubuntu 3265-1: Linux kernel vulnerabilities

    Date24 Apr 2017
    CategoryUbuntu
    44
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3265-1
    April 25, 2017
    
    linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon 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: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-gke: Linux kernel for Google Container Engine (GKE) systems
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    - linux-snapdragon: Linux kernel for Snapdragon Processors
    
    Details:
    
    It was discovered that a use-after-free flaw existed in the filesystem
    encryption subsystem in the Linux kernel. A local attacker could use this
    to cause a denial of service (system crash). (CVE-2017-7374)
    
    Andrey Konovalov discovered an out-of-bounds access in the IPv6 Generic
    Routing Encapsulation (GRE) tunneling implementation in the Linux kernel.
    An attacker could use this to possibly expose sensitive information.
    (CVE-2017-5897)
    
    Andrey Konovalov discovered that the IPv4 implementation in the Linux
    kernel did not properly handle invalid IP options in some situations. An
    attacker could use this to cause a denial of service or possibly execute
    arbitrary code. (CVE-2017-5970)
    
    Gareth Evans discovered that the shm IPC subsystem in the Linux kernel did
    not properly restrict mapping page zero. A local privileged attacker could
    use this to execute arbitrary code. (CVE-2017-5669)
    
    Alexander Popov discovered that a race condition existed in the Stream
    Control Transmission Protocol (SCTP) implementation in the Linux kernel. A
    local attacker could use this to cause a denial of service (system crash).
    (CVE-2017-5986)
    
    Dmitry Vyukov discovered that the Linux kernel did not properly handle TCP
    packets with the URG flag. A remote attacker could use this to cause a
    denial of service. (CVE-2017-6214)
    
    Andrey Konovalov discovered that the LLC subsytem in the Linux kernel did
    not properly set up a destructor in certain situations. A local attacker
    could use this to cause a denial of service (system crash). (CVE-2017-6345)
    
    It was discovered that a race condition existed in the AF_PACKET handling
    code in the Linux kernel. A local attacker could use this to cause a denial
    of service (system crash) or possibly execute arbitrary code.
    (CVE-2017-6346)
    
    Andrey Konovalov discovered that the IP layer in the Linux kernel made
    improper assumptions about internal data layout when performing checksums.
    A local attacker could use this to cause a denial of service (system crash)
    or possibly execute arbitrary code. (CVE-2017-6347)
    
    Dmitry Vyukov discovered race conditions in the Infrared (IrDA) subsystem
    in the Linux kernel. A local attacker could use this to cause a denial of
    service (deadlock). (CVE-2017-6348)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1012-gke      4.4.0-1012.12
      linux-image-4.4.0-1016-aws      4.4.0-1016.25
      linux-image-4.4.0-1054-raspi2   4.4.0-1054.61
      linux-image-4.4.0-1057-snapdragon  4.4.0-1057.61
      linux-image-4.4.0-75-generic    4.4.0-75.96
      linux-image-4.4.0-75-generic-lpae  4.4.0-75.96
      linux-image-4.4.0-75-lowlatency  4.4.0-75.96
      linux-image-4.4.0-75-powerpc-e500mc  4.4.0-75.96
      linux-image-4.4.0-75-powerpc-smp  4.4.0-75.96
      linux-image-4.4.0-75-powerpc64-smp  4.4.0-75.96
      linux-image-aws                 4.4.0.1016.19
      linux-image-generic             4.4.0.75.81
      linux-image-generic-lpae        4.4.0.75.81
      linux-image-gke                 4.4.0.1012.14
      linux-image-lowlatency          4.4.0.75.81
      linux-image-powerpc-e500mc      4.4.0.75.81
      linux-image-powerpc-smp         4.4.0.75.81
      linux-image-powerpc64-smp       4.4.0.75.81
      linux-image-raspi2              4.4.0.1054.55
      linux-image-snapdragon          4.4.0.1057.50
    
    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-3265-1
      CVE-2017-5669, CVE-2017-5897, CVE-2017-5970, CVE-2017-5986,
      CVE-2017-6214, CVE-2017-6345, CVE-2017-6346, CVE-2017-6347,
      CVE-2017-6348, CVE-2017-7374
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-75.96
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1016.25
      https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1012.12
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1054.61
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1057.61
    
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