Ubuntu 3753-1: Linux kernel vulnerabilities

    Date23 Aug 2018
    CategoryUbuntu
    2532
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3753-1
    August 24, 2018
    
    linux, linux-aws, linux-kvm, 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 Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    - linux-snapdragon: Linux kernel for Snapdragon processors
    
    Details:
    
    It was discovered that the generic SCSI driver in the Linux kernel did not
    properly enforce permissions on kernel memory access. A local attacker
    could use this to expose sensitive information or possibly elevate
    privileges. (CVE-2017-13168)
    
    Wen Xu discovered that a use-after-free vulnerability existed in the ext4
    filesystem implementation in the Linux kernel. An attacker could use this
    to construct a malicious ext4 image that, when mounted, could cause a
    denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2018-10876, CVE-2018-10879)
    
    Wen Xu discovered that a buffer overflow existed in the ext4 filesystem
    implementation in the Linux kernel. An attacker could use this to construct
    a malicious ext4 image that, when mounted, could cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2018-10877)
    
    Wen Xu discovered that an out-of-bounds write vulnerability existed in the
    ext4 filesystem implementation in the Linux kernel. An attacker could use
    this to construct a malicious ext4 image that, when mounted, could cause a
    denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2018-10878, CVE-2018-10882)
    
    Wen Xu discovered that the ext4 filesystem implementation in the Linux
    kernel did not properly keep meta-data information consistent in some
    situations. An attacker could use this to construct a malicious ext4 image
    that, when mounted, could cause a denial of service (system crash).
    (CVE-2018-10881)
    
    Shankara Pailoor discovered that the JFS filesystem implementation in the
    Linux kernel contained a buffer overflow when handling extended attributes.
    A local attacker could use this to cause a denial of service (system crash)
    or possibly execute arbitrary code. (CVE-2018-12233)
    
    Wen Xu discovered that the XFS filesystem implementation in the Linux
    kernel did not properly handle an error condition with a corrupted xfs
    image. An attacker could use this to construct a malicious xfs image that,
    when mounted, could cause a denial of service (system crash).
    (CVE-2018-13094)
    
    It was discovered that the Linux kernel did not properly handle setgid file
    creation when performed by a non-member of the group. A local attacker
    could use this to gain elevated privileges. (CVE-2018-13405)
    
    Silvio Cesare discovered that the generic VESA frame buffer driver in the
    Linux kernel contained an integer overflow. A local attacker could use this
    to cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2018-13406)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1032-kvm      4.4.0-1032.38
      linux-image-4.4.0-1066-aws      4.4.0-1066.76
      linux-image-4.4.0-1095-raspi2   4.4.0-1095.103
      linux-image-4.4.0-1099-snapdragon  4.4.0-1099.104
      linux-image-4.4.0-134-generic   4.4.0-134.160
      linux-image-4.4.0-134-generic-lpae  4.4.0-134.160
      linux-image-4.4.0-134-lowlatency  4.4.0-134.160
      linux-image-4.4.0-134-powerpc-e500mc  4.4.0-134.160
      linux-image-4.4.0-134-powerpc-smp  4.4.0-134.160
      linux-image-4.4.0-134-powerpc64-emb  4.4.0-134.160
      linux-image-4.4.0-134-powerpc64-smp  4.4.0-134.160
      linux-image-aws                 4.4.0.1066.68
      linux-image-generic             4.4.0.134.140
      linux-image-generic-lpae        4.4.0.134.140
      linux-image-kvm                 4.4.0.1032.31
      linux-image-lowlatency          4.4.0.134.140
      linux-image-powerpc-e500mc      4.4.0.134.140
      linux-image-powerpc-smp         4.4.0.134.140
      linux-image-powerpc64-emb       4.4.0.134.140
      linux-image-powerpc64-smp       4.4.0.134.140
      linux-image-raspi2              4.4.0.1095.95
      linux-image-snapdragon          4.4.0.1099.91
    
    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:
      https://usn.ubuntu.com/usn/usn-3753-1
      CVE-2017-13168, CVE-2018-10876, CVE-2018-10877, CVE-2018-10878,
      CVE-2018-10879, CVE-2018-10881, CVE-2018-10882, CVE-2018-12233,
      CVE-2018-13094, CVE-2018-13405, CVE-2018-13406
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-134.160
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1066.76
      https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1032.38
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1095.103
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1099.104
    
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