Ubuntu 3930-1: Linux kernel vulnerabilities

    Date02 Apr 2019
    CategoryUbuntu
    594
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3930-1
    April 02, 2019
    
    linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-raspi2
    vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.10
    
    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-raspi2: Linux kernel for Raspberry Pi 2
    
    Details:
    
    Mathias Payer and Hui Peng discovered a use-after-free vulnerability in the
    Advanced Linux Sound Architecture (ALSA) subsystem. A physically proximate
    attacker could use this to cause a denial of service (system crash).
    (CVE-2018-19824)
    
    Shlomi Oberman, Yuli Shapiro, and Ran Menscher discovered an information
    leak in the Bluetooth implementation of the Linux kernel. An attacker
    within Bluetooth range could use this to expose sensitive information
    (kernel memory). (CVE-2019-3459, CVE-2019-3460)
    
    Jann Horn discovered that the KVM implementation in the Linux kernel
    contained a use-after-free vulnerability. An attacker in a guest VM with
    access to /dev/kvm could use this to cause a denial of service (guest VM
    crash). (CVE-2019-6974)
    
    Jim Mattson and Felix Wilhelm discovered a use-after-free vulnerability in
    the KVM subsystem of the Linux kernel, when using nested virtual machines.
    A local attacker in a guest VM could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code in the host system.
    (CVE-2019-7221)
    
    Felix Wilhelm discovered that an information leak vulnerability existed in
    the KVM subsystem of the Linux kernel, when nested virtualization is used.
    A local attacker could use this to expose sensitive information (host
    system memory to a guest VM). (CVE-2019-7222)
    
    Jann Horn discovered that the eBPF implementation in the Linux kernel was
    insufficiently hardened against Spectre V1 attacks. A local attacker could
    use this to expose sensitive information. (CVE-2019-7308)
    
    It was discovered that a use-after-free vulnerability existed in the user-
    space API for crypto (af_alg) implementation in the Linux kernel. A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2019-8912)
    
    Jakub Jirasek discovered a use-after-free vulnerability in the SCTP
    implementation in the Linux kernel. A local attacker could use this to
    cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2019-8956)
    
    It was discovered that the Linux kernel did not properly deallocate memory
    when handling certain errors while reading files. A local attacker could
    use this to cause a denial of service (excessive memory consumption).
    (CVE-2019-8980)
    
    It was discovered that a use-after-free vulnerability existed in the IPMI
    implementation in the Linux kernel. A local attacker with access to the
    IPMI character device files could use this to cause a denial of service
    (system crash). (CVE-2019-9003)
    
    Jann Horn discovered that the SNMP NAT implementation in the Linux kernel
    performed insufficient ASN.1 length checks. An attacker could use this to
    cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2019-9162)
    
    Jann Horn discovered that the mmap implementation in the Linux kernel did
    not properly check for the mmap minimum address in some situations. A local
    attacker could use this to assist exploiting a kernel NULL pointer
    dereference vulnerability. (CVE-2019-9213)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.10:
      linux-image-4.18.0-1008-gcp     4.18.0-1008.9
      linux-image-4.18.0-1009-kvm     4.18.0-1009.9
      linux-image-4.18.0-1011-raspi2  4.18.0-1011.13
      linux-image-4.18.0-1012-aws     4.18.0-1012.14
      linux-image-4.18.0-1014-azure   4.18.0-1014.14
      linux-image-4.18.0-17-generic   4.18.0-17.18
      linux-image-4.18.0-17-generic-lpae  4.18.0-17.18
      linux-image-4.18.0-17-lowlatency  4.18.0-17.18
      linux-image-4.18.0-17-snapdragon  4.18.0-17.18
      linux-image-aws                 4.18.0.1012.12
      linux-image-azure               4.18.0.1014.15
      linux-image-gcp                 4.18.0.1008.8
      linux-image-generic             4.18.0.17.18
      linux-image-generic-lpae        4.18.0.17.18
      linux-image-gke                 4.18.0.1008.8
      linux-image-kvm                 4.18.0.1009.9
      linux-image-lowlatency          4.18.0.17.18
      linux-image-raspi2              4.18.0.1011.8
      linux-image-snapdragon          4.18.0.17.18
      linux-image-virtual             4.18.0.17.18
    
    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/usn/usn-3930-1
      CVE-2018-19824, CVE-2019-3459, CVE-2019-3460, CVE-2019-6974,
      CVE-2019-7221, CVE-2019-7222, CVE-2019-7308, CVE-2019-8912,
      CVE-2019-8956, CVE-2019-8980, CVE-2019-9003, CVE-2019-9162,
      CVE-2019-9213
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.18.0-17.18
      https://launchpad.net/ubuntu/+source/linux-aws/4.18.0-1012.14
      https://launchpad.net/ubuntu/+source/linux-azure/4.18.0-1014.14
      https://launchpad.net/ubuntu/+source/linux-gcp/4.18.0-1008.9
      https://launchpad.net/ubuntu/+source/linux-kvm/4.18.0-1009.9
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.18.0-1011.13
    
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