Ubuntu 3654-2: Linux kernel (Xenial HWE) vulnerabilities

    Date21 May 2018
    CategoryUbuntu
    3674
    Posted ByAnthony Pell
    Several security issues were addressed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3654-2
    May 22, 2018
    
    linux-lts-xenial, linux-aws vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    Several security issues were addressed in the Linux kernel.
    
    Software Description:
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-3654-1 fixed vulnerabilities and added mitigations in the Linux
    kernel for Ubuntu 16.04 LTS. This update provides the corresponding
    updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu
    16.04 LTS for Ubuntu 14.04 LTS.
    
    Jann Horn and Ken Johnson discovered that microprocessors utilizing
    speculative execution of a memory read may allow unauthorized memory
    reads via a sidechannel attack. This flaw is known as Spectre
    Variant 4. A local attacker could use this to expose sensitive
    information, including kernel memory. (CVE-2018-3639)
    
    Tuba Yavuz discovered that a double-free error existed in the USBTV007
    driver of the Linux kernel. A local attacker could use this to cause a
    denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2017-17975)
    
    It was discovered that a race condition existed in the F2FS implementation
    in the Linux kernel. A local attacker could use this to cause a denial of
    service (system crash). (CVE-2017-18193)
    
    It was discovered that a buffer overflow existed in the Hisilicon HNS
    Ethernet Device driver in the Linux kernel. A local attacker could use this
    to cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2017-18222)
    
    It was discovered that the netfilter subsystem in the Linux kernel did not
    validate that rules containing jumps contained user-defined chains. A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2018-1065)
    
    It was discovered that the netfilter subsystem of the Linux kernel did not
    properly validate ebtables offsets. A local attacker could use this to
    cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2018-1068)
    
    It was discovered that a null pointer dereference vulnerability existed in
    the DCCP protocol implementation in the Linux kernel. A local attacker
    could use this to cause a denial of service (system crash). (CVE-2018-1130)
    
    It was discovered that the SCTP Protocol implementation in the Linux kernel
    did not properly validate userspace provided payload lengths in some
    situations. A local attacker could use this to cause a denial of service
    (system crash). (CVE-2018-5803)
    
    It was discovered that a double free error existed in the block layer
    subsystem of the Linux kernel when setting up a request queue. A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2018-7480)
    
    It was discovered that a memory leak existed in the SAS driver subsystem of
    the Linux kernel. A local attacker could use this to cause a denial of
    service (memory exhaustion). (CVE-2018-7757)
    
    It was discovered that a race condition existed in the x86 machine check
    handler in the Linux kernel. A local privileged attacker could use this to
    cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2018-7995)
    
    Eyal Itkin discovered that the USB displaylink video adapter driver in the
    Linux kernel did not properly validate mmap offsets sent from userspace. A
    local attacker could use this to expose sensitive information (kernel
    memory) or possibly execute arbitrary code. (CVE-2018-8781)
    
    Silvio Cesare discovered a buffer overwrite existed in the NCPFS
    implementation in the Linux kernel. A remote attacker controlling a
    malicious NCPFS server could use this to cause a denial of service (system
    crash) or possibly execute arbitrary code. (CVE-2018-8822)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-4.4.0-1022-aws      4.4.0-1022.22
      linux-image-4.4.0-127-generic   4.4.0-127.153~14.04.1
      linux-image-4.4.0-127-generic-lpae  4.4.0-127.153~14.04.1
      linux-image-4.4.0-127-lowlatency  4.4.0-127.153~14.04.1
      linux-image-4.4.0-127-powerpc-e500mc  4.4.0-127.153~14.04.1
      linux-image-4.4.0-127-powerpc-smp  4.4.0-127.153~14.04.1
      linux-image-4.4.0-127-powerpc64-emb  4.4.0-127.153~14.04.1
      linux-image-4.4.0-127-powerpc64-smp  4.4.0-127.153~14.04.1
      linux-image-aws                 4.4.0.1022.22
      linux-image-generic-lpae-lts-xenial  4.4.0.127.107
      linux-image-generic-lts-xenial  4.4.0.127.107
      linux-image-lowlatency-lts-xenial  4.4.0.127.107
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.127.107
      linux-image-powerpc-smp-lts-xenial  4.4.0.127.107
      linux-image-powerpc64-emb-lts-xenial  4.4.0.127.107
      linux-image-powerpc64-smp-lts-xenial  4.4.0.127.107
    
    Please note that fully mitigating CVE-2018-3639 (Spectre Variant 4)
    may require corresponding processor microcode/firmware updates or,
    in virtual environments, hypervisor updates. On i386 and amd64
    architectures, the SSBD feature is required to enable the kernel
    mitigations. BIOS vendors will be making updates available for Intel
    processors that implement SSBD and Ubuntu is working with Intel to
    provide future microcode updates. Ubuntu users with a processor from
    a different vendor should contact the vendor to identify necessary
    firmware updates. Ubuntu provided corresponding QEMU updates for users
    of self-hosted virtual environments in USN 3651-1. Ubuntu users in
    cloud environments should contact the cloud provider to confirm that
    the hypervisor has been updated to expose the new CPU features to
    virtual machines.
    
    References:
      https://usn.ubuntu.com/usn/usn-3654-2
      https://usn.ubuntu.com/usn/usn-3654-1
      CVE-2017-17975, CVE-2017-18193, CVE-2017-18222, CVE-2018-1065,
      CVE-2018-1068, CVE-2018-1130, CVE-2018-3639, CVE-2018-5803,
      CVE-2018-7480, CVE-2018-7757, CVE-2018-7995, CVE-2018-8781,
      CVE-2018-8822,
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Variant4
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1022.22
      https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-127.153~14.04.1
    
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