Ubuntu 3742-2: Linux kernel (Trusty HWE) vulnerabilities

    Date14 Aug 2018
    CategoryUbuntu
    2907
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3742-2
    August 14, 2018
    
    linux-lts-trusty vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM
    
    Details:
    
    USN-3742-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 14.04 for Ubuntu
    12.04 ESM.
    
    It was discovered that memory present in the L1 data cache of an Intel CPU
    core may be exposed to a malicious process that is executing on the CPU
    core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
    attacker in a guest virtual machine could use this to expose sensitive
    information (memory from other guests or the host OS). (CVE-2018-3646)
    
    It was discovered that memory present in the L1 data cache of an Intel CPU
    core may be exposed to a malicious process that is executing on the CPU
    core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
    attacker could use this to expose sensitive information (memory from the
    kernel or other processes). (CVE-2018-3620)
    
    Andrey Konovalov discovered an out-of-bounds read in the POSIX timers
    subsystem in the Linux kernel. A local attacker could use this to cause a
    denial of service (system crash) or expose sensitive information.
    (CVE-2017-18344)
    
    Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel
    performed algorithmically expensive operations in some situations when
    handling incoming packets. A remote attacker could use this to cause a
    denial of service. (CVE-2018-5390)
    
    Juha-Matti Tilli discovered that the IP implementation in the Linux kernel
    performed algorithmically expensive operations in some situations when
    handling incoming packet fragments. A remote attacker could use this to
    cause a denial of service. (CVE-2018-5391)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      linux-image-3.13.0-155-generic  3.13.0-155.206~precise1
      linux-image-3.13.0-155-generic-lpae  3.13.0-155.206~precise1
      linux-image-generic-lpae-lts-trusty  3.13.0.155.145
      linux-image-generic-lts-trusty  3.13.0.155.145
    
    Please note that the recommended mitigation for CVE-2018-3646 involves
    updating processor microcode in addition to updating the kernel;
    however, the kernel includes a fallback for processors that have not
    received microcode updates.
    
    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-3742-2
      https://usn.ubuntu.com/usn/usn-3742-1
      CVE-2017-18344, CVE-2018-3620, CVE-2018-3646, CVE-2018-5390,
      CVE-2018-5391,
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF
    
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