Ubuntu 4392-1: Linux kernel vulnerabilities

    Date 09 Jun 2020
    154
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4392-1
    June 10, 2020
    
    linux, linux-lts-trusty vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM
    
    Details:
    
    It was discovered that the Marvell WiFi-Ex Driver in the Linux kernel did
    not properly validate status lengths in messages received from an access
    point, leading to a buffer overflow. A physically proximate attacker
    controlling an access point could use this to construct messages that could
    possibly result in arbitrary code execution. (CVE-2020-12654)
    
    It was discovered that memory contents previously stored in
    microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY
    read operations on Intel client and Xeon E3 processors may be briefly
    exposed to processes on the same or different processor cores. A local
    attacker could use this to expose sensitive information. (CVE-2020-0543)
    
    Piotr Krysiuk discovered that race conditions existed in the file system
    implementation in the Linux kernel. A local attacker could use this to
    cause a denial of service (system crash). (CVE-2020-12114)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      linux-image-3.13.0-180-generic  3.13.0-180.231
      linux-image-3.13.0-180-generic-lpae  3.13.0-180.231
      linux-image-3.13.0-180-lowlatency  3.13.0-180.231
      linux-image-3.13.0-180-powerpc-e500  3.13.0-180.231
      linux-image-3.13.0-180-powerpc-e500mc  3.13.0-180.231
      linux-image-3.13.0-180-powerpc-smp  3.13.0-180.231
      linux-image-3.13.0-180-powerpc64-emb  3.13.0-180.231
      linux-image-3.13.0-180-powerpc64-smp  3.13.0-180.231
      linux-image-generic             3.13.0.180.189
      linux-image-generic-lpae        3.13.0.180.189
      linux-image-highbank            3.13.0.180.189
      linux-image-lowlatency          3.13.0.180.189
      linux-image-omap                3.13.0.180.189
      linux-image-powerpc-e500        3.13.0.180.189
      linux-image-powerpc-e500mc      3.13.0.180.189
      linux-image-powerpc-smp         3.13.0.180.189
      linux-image-powerpc64-emb       3.13.0.180.189
      linux-image-powerpc64-smp       3.13.0.180.189
      linux-image-server              3.13.0.180.189
      linux-image-virtual             3.13.0.180.189
    
    Ubuntu 12.04 ESM:
      linux-image-3.13.0-180-generic  3.13.0-180.231~12.04.1
      linux-image-3.13.0-180-generic-lpae  3.13.0-180.231~12.04.1
      linux-image-3.13.0-180-lowlatency  3.13.0-180.231~12.04.1
      linux-image-generic-lpae-lts-trusty  3.13.0.180.166
      linux-image-generic-lts-trusty  3.13.0.180.166
    
    Please note that the mitigation for CVE-2020-0543 requires a processor
    microcode update to be applied, either from your system manufacturer
    or via the intel-microcode package. The kernel update for this issue
    provides the ability to disable the mitigation and to report
    vulnerability status.
    
    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/4392-1
      CVE-2020-0543, CVE-2020-12114, CVE-2020-12654,
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SRBDS
    

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