Ubuntu 3653-1: Linux kernel vulnerabilities

    Date21 May 2018
    CategoryUbuntu
    2414
    Posted ByAnthony Pell
    Several security issues were addressed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3653-1
    May 22, 2018
    
    linux vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 17.10
    
    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)
    
    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)
    
    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 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 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)
    
    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 17.10:
      linux-image-4.13.0-43-generic   4.13.0-43.48
      linux-image-4.13.0-43-generic-lpae  4.13.0-43.48
      linux-image-4.13.0-43-lowlatency  4.13.0-43.48
      linux-image-generic             4.13.0.43.46
      linux-image-generic-lpae        4.13.0.43.46
      linux-image-lowlatency          4.13.0.43.46
    
    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-3653-1
      CVE-2017-17449, CVE-2017-17975, CVE-2017-18203, CVE-2017-18208,
      CVE-2018-3639, CVE-2018-8822,
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Variant4
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.13.0-43.48
    
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