Ubuntu 4387-1: Linux kernel vulnerabilities

    Date 09 Jun 2020
    121
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4387-1
    June 09, 2020
    
    linux, linux-aws, linux-aws-5.3, linux-azure, linux-azure-5.3, linux-gcp,
    linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-kvm, linux-oracle,
    linux-oracle-5.3 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 19.10
    - Ubuntu 18.04 LTS
    
    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-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-oracle: Linux kernel for Oracle Cloud systems
    - linux-aws-5.3: Linux kernel for Amazon Web Services (AWS) systems
    - linux-azure-5.3: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp-5.3: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-gke-5.3: Linux kernel for Google Container Engine (GKE) systems
    - linux-hwe: Linux hardware enablement (HWE) kernel
    - linux-oracle-5.3: Linux kernel for Oracle Cloud systems
    
    Details:
    
    It was discovered that the F2FS file system implementation in the Linux
    kernel did not properly perform bounds checking on xattrs in some
    situations. A local attacker could possibly use this to expose sensitive
    information (kernel memory). (CVE-2020-0067)
    
    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)
    
    Bui Quang Minh discovered that the XDP socket implementation in the Linux
    kernel did not properly validate meta-data passed from user space, leading
    to an out-of-bounds write vulnerability. A local attacker with the
    CAP_NET_ADMIN capability could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2020-12659)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 19.10:
      linux-image-5.3.0-1023-aws      5.3.0-1023.25
      linux-image-5.3.0-1023-kvm      5.3.0-1023.25
      linux-image-5.3.0-1024-oracle   5.3.0-1024.26
      linux-image-5.3.0-1026-gcp      5.3.0-1026.28
      linux-image-5.3.0-1028-azure    5.3.0-1028.29
      linux-image-5.3.0-59-generic    5.3.0-59.53
      linux-image-5.3.0-59-generic-lpae  5.3.0-59.53
      linux-image-5.3.0-59-lowlatency  5.3.0-59.53
      linux-image-5.3.0-59-snapdragon  5.3.0-59.53
      linux-image-aws                 5.3.0.1023.34
      linux-image-azure               5.3.0.1028.47
      linux-image-gcp                 5.3.0.1026.37
      linux-image-generic             5.3.0.59.49
      linux-image-generic-lpae        5.3.0.59.49
      linux-image-gke                 5.3.0.1026.37
      linux-image-kvm                 5.3.0.1023.21
      linux-image-lowlatency          5.3.0.59.49
      linux-image-oracle              5.3.0.1024.40
      linux-image-snapdragon          5.3.0.59.49
      linux-image-virtual             5.3.0.59.49
    
    Ubuntu 18.04 LTS:
      linux-image-5.3.0-1023-aws      5.3.0-1023.25~18.04.1
      linux-image-5.3.0-1024-oracle   5.3.0-1024.26~18.04.1
      linux-image-5.3.0-1026-gcp      5.3.0-1026.28~18.04.1
      linux-image-5.3.0-1026-gke      5.3.0-1026.28~18.04.1
      linux-image-5.3.0-1028-azure    5.3.0-1028.29~18.04.1
      linux-image-5.3.0-59-generic    5.3.0-59.53~18.04.1
      linux-image-5.3.0-59-generic-lpae  5.3.0-59.53~18.04.1
      linux-image-5.3.0-59-lowlatency  5.3.0-59.53~18.04.1
      linux-image-aws                 5.3.0.1023.23
      linux-image-azure               5.3.0.1028.25
      linux-image-gcp                 5.3.0.1026.21
      linux-image-generic-hwe-18.04   5.3.0.59.113
      linux-image-generic-lpae-hwe-18.04  5.3.0.59.113
      linux-image-gke-5.3             5.3.0.1026.13
      linux-image-gkeop-5.3           5.3.0.59.113
      linux-image-lowlatency-hwe-18.04  5.3.0.59.113
      linux-image-oracle              5.3.0.1024.22
      linux-image-snapdragon-hwe-18.04  5.3.0.59.113
      linux-image-virtual-hwe-18.04   5.3.0.59.113
    
    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/4387-1
      CVE-2020-0067, CVE-2020-0543, CVE-2020-12114, CVE-2020-12464,
      CVE-2020-12659, https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SRBDS
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/5.3.0-59.53
      https://launchpad.net/ubuntu/+source/linux-aws/5.3.0-1023.25
      https://launchpad.net/ubuntu/+source/linux-azure/5.3.0-1028.29
      https://launchpad.net/ubuntu/+source/linux-gcp/5.3.0-1026.28
      https://launchpad.net/ubuntu/+source/linux-kvm/5.3.0-1023.25
      https://launchpad.net/ubuntu/+source/linux-oracle/5.3.0-1024.26
      https://launchpad.net/ubuntu/+source/linux-aws-5.3/5.3.0-1023.25~18.04.1
      https://launchpad.net/ubuntu/+source/linux-azure-5.3/5.3.0-1028.29~18.04.1
      https://launchpad.net/ubuntu/+source/linux-gcp-5.3/5.3.0-1026.28~18.04.1
      https://launchpad.net/ubuntu/+source/linux-gke-5.3/5.3.0-1026.28~18.04.1
      https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-59.53~18.04.1
      https://launchpad.net/ubuntu/+source/linux-oracle-5.3/5.3.0-1024.26~18.04.1
    

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