Ubuntu 3821-2: Linux kernel (Xenial HWE) vulnerabilities

    Date14 Nov 2018
    CategoryUbuntu
    4094
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3821-2
    November 14, 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 fixed 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-3821-1 fixed vulnerabilities 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.
    
    Wen Xu discovered that the ext4 filesystem implementation in the Linux
    kernel did not properly ensure that xattr information remained in inode
    bodies. An attacker could use this to construct a malicious ext4 image
    that, when mounted, could cause a denial of service (system crash).
    (CVE-2018-10880)
    
    It was discovered that the alarmtimer implementation in the Linux kernel
    contained an integer overflow vulnerability. A local attacker could use
    this to cause a denial of service. (CVE-2018-13053)
    
    Wen Xu discovered that the f2fs filesystem implementation in the Linux
    kernel did not properly validate metadata. An attacker could use this to
    construct a malicious f2fs image that, when mounted, could cause a denial
    of service (system crash). (CVE-2018-13096)
    
    Wen Xu and Po-Ning Tseng discovered that the btrfs filesystem
    implementation in the Linux kernel did not properly handle relocations in
    some situations. An attacker could use this to construct a malicious btrfs
    image that, when mounted, could cause a denial of service (system crash).
    (CVE-2018-14609)
    
    Wen Xu discovered that the HFS+ filesystem implementation in the Linux
    kernel did not properly handle malformed catalog data in some situations.
    An attacker could use this to construct a malicious HFS+ image that, when
    mounted, could cause a denial of service (system crash). (CVE-2018-14617)
    
    Jann Horn discovered that the procfs file system implementation in the
    Linux kernel did not properly restrict the ability to inspect the kernel
    stack of an arbitrary task. A local attacker could use this to expose
    sensitive information. (CVE-2018-17972)
    
    It was discovered that the KVM implementation in the Linux kernel on ARM
    64bit processors did not properly handle some ioctls. An attacker with the
    privilege to create KVM-based virtual machines could use this to cause a
    denial of service (host system crash) or execute arbitrary code in the
    host. (CVE-2018-18021)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      linux-image-4.4.0-1034-aws      4.4.0-1034.37
      linux-image-4.4.0-139-generic   4.4.0-139.165~14.04.1
      linux-image-4.4.0-139-generic-lpae  4.4.0-139.165~14.04.1
      linux-image-4.4.0-139-lowlatency  4.4.0-139.165~14.04.1
      linux-image-4.4.0-139-powerpc-e500mc  4.4.0-139.165~14.04.1
      linux-image-4.4.0-139-powerpc-smp  4.4.0-139.165~14.04.1
      linux-image-4.4.0-139-powerpc64-emb  4.4.0-139.165~14.04.1
      linux-image-4.4.0-139-powerpc64-smp  4.4.0-139.165~14.04.1
      linux-image-aws                 4.4.0.1034.34
      linux-image-generic-lpae-lts-xenial  4.4.0.139.119
      linux-image-generic-lts-xenial  4.4.0.139.119
      linux-image-lowlatency-lts-xenial  4.4.0.139.119
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.139.119
      linux-image-powerpc-smp-lts-xenial  4.4.0.139.119
      linux-image-powerpc64-emb-lts-xenial  4.4.0.139.119
      linux-image-powerpc64-smp-lts-xenial  4.4.0.139.119
    
    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-3821-2
      https://usn.ubuntu.com/usn/usn-3821-1
      CVE-2018-10880, CVE-2018-13053, CVE-2018-13096, CVE-2018-14609,
      CVE-2018-14617, CVE-2018-17972, CVE-2018-18021
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1034.37
      https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-139.165~14.04.1
    
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