Ubuntu 3655-1: Linux kernel vulnerabilities

    Date21 May 2018
    CategoryUbuntu
    3618
    Posted ByAnthony Pell
    Several security issues were addressed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3655-1
    May 22, 2018
    
    linux 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: Linux kernel
    
    Details:
    
    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)
    
    Jan H. Schönherr discovered that the Xen subsystem did not properly handle
    block IO merges correctly in some situations. An attacker in a guest vm
    could use this to cause a denial of service (host crash) or possibly gain
    administrative privileges in the host. (CVE-2017-12134)
    
    It was discovered that the Bluetooth HIP Protocol implementation in the
    Linux kernel did not properly validate HID connection setup information. An
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2017-13220)
    
    It was discovered that a buffer overread vulnerability existed in the
    keyring subsystem of the Linux kernel. A local attacker could possibly use
    this to expose sensitive information (kernel memory). (CVE-2017-13305)
    
    It was discovered that the netlink subsystem in the Linux kernel did not
    properly restrict observations of netlink messages to the appropriate net
    namespace. A local attacker could use this to expose sensitive information
    (kernel netlink traffic). (CVE-2017-17449)
    
    It was discovered that a race condition existed in the i8042 serial device
    driver implementation in the Linux kernel. A physically proximate attacker
    could use this to cause a denial of service (system crash) or possibly
    execute arbitrary code. (CVE-2017-18079)
    
    It was discovered that a race condition existed in the Device Mapper
    component of the Linux kernel. A local attacker could use this to cause a
    denial of service (system crash). (CVE-2017-18203)
    
    It was discovered that a race condition existed in the OCFS2 file system
    implementation in the Linux kernel. A local attacker could use this to
    cause a denial of service (kernel deadlock). (CVE-2017-18204)
    
    It was discovered that an infinite loop could occur in the madvise(2)
    implementation in the Linux kernel in certain circumstances. A local
    attacker could use this to cause a denial of service (system hang).
    (CVE-2017-18208)
    
    Kefeng Wang discovered that a race condition existed in the memory locking
    implementation in the Linux kernel. A local attacker could use this to
    cause a denial of service. (CVE-2017-18221)
    
    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-3.13.0-149-generic  3.13.0-149.199
      linux-image-3.13.0-149-generic-lpae  3.13.0-149.199
      linux-image-3.13.0-149-lowlatency  3.13.0-149.199
      linux-image-3.13.0-149-powerpc-e500  3.13.0-149.199
      linux-image-3.13.0-149-powerpc-e500mc  3.13.0-149.199
      linux-image-3.13.0-149-powerpc-smp  3.13.0-149.199
      linux-image-3.13.0-149-powerpc64-emb  3.13.0-149.199
      linux-image-3.13.0-149-powerpc64-smp  3.13.0-149.199
      linux-image-generic             3.13.0.149.159
      linux-image-generic-lpae        3.13.0.149.159
      linux-image-lowlatency          3.13.0.149.159
      linux-image-powerpc-e500        3.13.0.149.159
      linux-image-powerpc-e500mc      3.13.0.149.159
      linux-image-powerpc-smp         3.13.0.149.159
      linux-image-powerpc64-emb       3.13.0.149.159
      linux-image-powerpc64-smp       3.13.0.149.159
    
    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-3655-1
      CVE-2017-12134, CVE-2017-13220, CVE-2017-13305, CVE-2017-17449,
      CVE-2017-18079, CVE-2017-18203, CVE-2017-18204, CVE-2017-18208,
      CVE-2017-18221, CVE-2018-3639, CVE-2018-8822,
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Variant4
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.13.0-149.199
    
    
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