Ubuntu 4391-1: Linux kernel vulnerabilities

    Date 09 Jun 2020
    150
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4391-1
    June 10, 2020
    
    linux, linux-aws, linux-kvm vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    - Ubuntu 14.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    It was discovered that the ext4 file system implementation in the Linux
    kernel did not properly handle setxattr operations in some situations. A
    local attacker could use this to cause a denial of service (system crash)
    or possibly execute arbitrary code. (CVE-2019-19319)
    
    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)
    
    It was discovered that the USB susbsystem's scatter-gather implementation
    in the Linux kernel did not properly take data references in some
    situations, leading to a use-after-free. A physically proximate attacker
    could use this to cause a denial of service (system crash) or possibly
    execute arbitrary code. (CVE-2020-12464)
    
    It was discovered that the DesignWare SPI controller driver in the Linux
    kernel contained a race condition. A local attacker could possibly use this
    to cause a denial of service (system crash). (CVE-2020-12769)
    
    It was discovered that the exit signaling implementation in the Linux
    kernel contained an integer overflow. A local attacker could use this to
    cause a denial of service (arbitrary application crash). (CVE-2020-12826)
    
    Xiumei Mu discovered that the IPSec implementation in the Linux kernel did
    not properly encrypt IPv6 traffic in some situations. An attacker could use
    this to expose sensitive information. (CVE-2020-1749)
    
    Dmitry Vyukov discovered that the SELinux netlink security hook in the
    Linux kernel did not validate messages in some situations. A privileged
    attacker could use this to bypass SELinux netlink restrictions.
    (CVE-2020-10751)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1075-kvm      4.4.0-1075.82
      linux-image-4.4.0-1109-aws      4.4.0-1109.120
      linux-image-4.4.0-184-generic   4.4.0-184.214
      linux-image-4.4.0-184-generic-lpae  4.4.0-184.214
      linux-image-4.4.0-184-lowlatency  4.4.0-184.214
      linux-image-4.4.0-184-powerpc-e500mc  4.4.0-184.214
      linux-image-4.4.0-184-powerpc-smp  4.4.0-184.214
      linux-image-4.4.0-184-powerpc64-emb  4.4.0-184.214
      linux-image-4.4.0-184-powerpc64-smp  4.4.0-184.214
      linux-image-aws                 4.4.0.1109.113
      linux-image-generic             4.4.0.184.190
      linux-image-generic-lpae        4.4.0.184.190
      linux-image-kvm                 4.4.0.1075.73
      linux-image-lowlatency          4.4.0.184.190
      linux-image-powerpc-e500mc      4.4.0.184.190
      linux-image-powerpc-smp         4.4.0.184.190
      linux-image-powerpc64-emb       4.4.0.184.190
      linux-image-powerpc64-smp       4.4.0.184.190
      linux-image-virtual             4.4.0.184.190
    
    Ubuntu 14.04 ESM:
      linux-image-4.4.0-1073-aws      4.4.0-1073.77
      linux-image-4.4.0-184-generic   4.4.0-184.214~14.04.1
      linux-image-4.4.0-184-generic-lpae  4.4.0-184.214~14.04.1
      linux-image-4.4.0-184-lowlatency  4.4.0-184.214~14.04.1
      linux-image-4.4.0-184-powerpc-e500mc  4.4.0-184.214~14.04.1
      linux-image-4.4.0-184-powerpc-smp  4.4.0-184.214~14.04.1
      linux-image-4.4.0-184-powerpc64-emb  4.4.0-184.214~14.04.1
      linux-image-4.4.0-184-powerpc64-smp  4.4.0-184.214~14.04.1
      linux-image-aws                 4.4.0.1073.70
      linux-image-generic-lpae-lts-xenial  4.4.0.184.161
      linux-image-generic-lts-xenial  4.4.0.184.161
      linux-image-lowlatency-lts-xenial  4.4.0.184.161
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.184.161
      linux-image-powerpc-smp-lts-xenial  4.4.0.184.161
      linux-image-powerpc64-emb-lts-xenial  4.4.0.184.161
      linux-image-powerpc64-smp-lts-xenial  4.4.0.184.161
      linux-image-virtual-lts-xenial  4.4.0.184.161
    
    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/4391-1
      CVE-2019-19319, CVE-2020-0543, CVE-2020-10751, CVE-2020-12114,
      CVE-2020-12464, CVE-2020-12769, CVE-2020-12826, CVE-2020-1749,
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SRBDS
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-184.214
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1109.120
      https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1075.82
    

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