Ubuntu 4162-2: Linux kernel (Azure) vulnerabilities

    Date22 Oct 2019
    CategoryUbuntu
    964
    Posted ByLinuxSecurity Advisories
    Ubuntu Large
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4162-2
    October 23, 2019
    
    linux-azure vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-azure: Linux kernel for Microsoft Azure Cloud systems
    
    Details:
    
    USN-4162-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
    LTS. This update provides the corresponding updates for the Linux
    kernel for Microsoft Azure Cloud systems for Ubuntu 14.04 ESM.
    
    It was discovered that the RSI 91x Wi-Fi driver in the Linux kernel did not
    did not handle detach operations correctly, leading to a use-after-free
    vulnerability. A physically proximate attacker could use this to cause a
    denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2018-21008)
    
    Wen Huang discovered that the Marvell Wi-Fi device driver in the Linux
    kernel did not properly perform bounds checking, leading to a heap
    overflow. A local attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2019-14814,
    CVE-2019-14815, CVE-2019-14816)
    
    Matt Delco discovered that the KVM hypervisor implementation in the Linux
    kernel did not properly perform bounds checking when handling coalesced
    MMIO write operations. A local attacker with write access to /dev/kvm could
    use this to cause a denial of service (system crash). (CVE-2019-14821)
    
    Hui Peng and Mathias Payer discovered that the USB audio driver for the
    Linux kernel did not properly validate device meta data. A physically
    proximate attacker could use this to cause a denial of service (system
    crash). (CVE-2019-15117)
    
    Hui Peng and Mathias Payer discovered that the USB audio driver for the
    Linux kernel improperly performed recursion while handling device meta
    data. A physically proximate attacker could use this to cause a denial of
    service (system crash). (CVE-2019-15118)
    
    It was discovered that the Technisat DVB-S/S2 USB device driver in the
    Linux kernel contained a buffer overread. A physically proximate attacker
    could use this to cause a denial of service (system crash) or possibly
    expose sensitive information. (CVE-2019-15505)
    
    Brad Spengler discovered that a Spectre mitigation was improperly
    implemented in the ptrace susbsystem of the Linux kernel. A local attacker
    could possibly use this to expose sensitive information. (CVE-2019-15902)
    
    It was discovered that the SMB networking file system implementation in the
    Linux kernel contained a buffer overread. An attacker could use this to
    expose sensitive information (kernel memory). (CVE-2019-15918)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      linux-image-4.15.0-1061-azure   4.15.0-1061.66~14.04.1
      linux-image-azure               4.15.0.1061.47
    
    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/4162-2
      https://usn.ubuntu.com/4162-1
      CVE-2018-21008, CVE-2019-14814, CVE-2019-14815, CVE-2019-14816,
      CVE-2019-14821, CVE-2019-15117, CVE-2019-15118, CVE-2019-15505,
      CVE-2019-15902, CVE-2019-15918
    
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