Ubuntu 4287-2: Linux kernel (Azure) vulnerabilities

    Date 18 Feb 2020
    892
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4287-2
    February 18, 2020
    
    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-4287-1 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 Linux kernel did not properly clear data
    structures on context switches for certain Intel graphics processors. A
    local attacker could use this to expose sensitive information.
    (CVE-2019-14615)
    
    It was discovered that the Atheros 802.11ac wireless USB device driver in
    the Linux kernel did not properly validate device metadata. A physically
    proximate attacker could use this to cause a denial of service (system
    crash). (CVE-2019-15099)
    
    It was discovered that the HSA Linux kernel driver for AMD GPU devices did
    not properly check for errors in certain situations, leading to a NULL
    pointer dereference. A local attacker could possibly use this to cause a
    denial of service. (CVE-2019-16229)
    
    It was discovered that the Marvell 8xxx Libertas WLAN device driver in the
    Linux kernel did not properly check for errors in certain situations,
    leading to a NULL pointer dereference. A local attacker could possibly use
    this to cause a denial of service. (CVE-2019-16232)
    
    It was discovered that a race condition existed in the Virtual Video Test
    Driver in the Linux kernel. An attacker with write access to /dev/video0 on
    a system with the vivid module loaded could possibly use this to gain
    administrative privileges. (CVE-2019-18683)
    
    It was discovered that the Renesas Digital Radio Interface (DRIF) driver in
    the Linux kernel did not properly initialize data. A local attacker could
    possibly use this to expose sensitive information (kernel memory).
    (CVE-2019-18786)
    
    It was discovered that the Afatech AF9005 DVB-T USB device driver in the
    Linux kernel did not properly deallocate memory in certain error
    conditions. A local attacker could possibly use this to cause a denial of
    service (kernel memory exhaustion). (CVE-2019-18809)
    
    It was discovered that the btrfs file system in the Linux kernel did not
    properly validate metadata, leading to a NULL pointer dereference. An
    attacker could use this to specially craft a file system image that, when
    mounted, could cause a denial of service (system crash). (CVE-2019-18885)
    
    It was discovered that multiple memory leaks existed in the Marvell WiFi-Ex
    Driver for the Linux kernel. A local attacker could possibly use this to
    cause a denial of service (kernel memory exhaustion). (CVE-2019-19057)
    
    It was discovered that the crypto subsystem in the Linux kernel did not
    properly deallocate memory in certain error conditions. A local attacker
    could use this to cause a denial of service (kernel memory exhaustion).
    (CVE-2019-19062)
    
    It was discovered that the Realtek rtlwifi USB device driver in the Linux
    kernel did not properly deallocate memory in certain error conditions. A
    local attacker could possibly use this to cause a denial of service (kernel
    memory exhaustion). (CVE-2019-19063)
    
    It was discovered that the RSI 91x WLAN device driver in the Linux kernel
    did not properly deallocate memory in certain error conditions. A local
    attacker could use this to cause a denial of service (kernel memory
    exhaustion). (CVE-2019-19071)
    
    It was discovered that the Atheros 802.11ac wireless USB device driver in
    the Linux kernel did not properly deallocate memory in certain error
    conditions. A local attacker could possibly use this to cause a denial of
    service (kernel memory exhaustion). (CVE-2019-19078)
    
    It was discovered that the AMD GPU device drivers in the Linux kernel did
    not properly deallocate memory in certain error conditions. A local
    attacker could use this to possibly cause a denial of service (kernel
    memory exhaustion). (CVE-2019-19082)
    
    Dan Carpenter discovered that the AppleTalk networking subsystem of the
    Linux kernel did not properly handle certain error conditions, leading to a
    NULL pointer dereference. A local attacker could use this to cause a denial
    of service (system crash). (CVE-2019-19227)
    
    It was discovered that the KVM hypervisor implementation in the Linux
    kernel did not properly handle ioctl requests to get emulated CPUID
    features. An attacker with access to /dev/kvm could use this to cause a
    denial of service (system crash). (CVE-2019-19332)
    
    It was discovered that the ext4 file system implementation in the Linux
    kernel did not properly handle certain conditions. An attacker could use
    this to specially craft an ext4 file system that, when mounted, could cause
    a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2019-19767)
    
    Gao Chuan discovered that the SAS Class driver in the Linux kernel
    contained a race condition that could lead to a NULL pointer dereference. A
    local attacker could possibly use this to cause a denial of service (system
    crash). (CVE-2019-19965)
    
    It was discovered that the Datagram Congestion Control Protocol (DCCP)
    implementation in the Linux kernel did not properly deallocate memory in
    certain error conditions. An attacker could possibly use this to cause a
    denial of service (kernel memory exhaustion). (CVE-2019-20096)
    
    Mitchell Frank discovered that the Wi-Fi implementation in the Linux kernel
    when used as an access point would send IAPP location updates for stations
    before client authentication had completed. A physically proximate attacker
    could use this to cause a denial of service. (CVE-2019-5108)
    
    It was discovered that a race condition can lead to a use-after-free while
    destroying GEM contexts in the i915 driver for the Linux kernel. A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2020-7053)
    
    It was discovered that the B2C2 FlexCop USB device driver in the Linux
    kernel did not properly validate device metadata. A physically proximate
    attacker could use this to cause a denial of service (system crash).
    (CVE-2019-15291)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      linux-image-4.15.0-1069-azure   4.15.0-1069.74~14.04.1
      linux-image-azure               4.15.0.1069.55
    
    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/4287-2
      https://usn.ubuntu.com/4287-1
      CVE-2019-14615, CVE-2019-15099, CVE-2019-15291, CVE-2019-16229,
      CVE-2019-16232, CVE-2019-18683, CVE-2019-18786, CVE-2019-18809,
      CVE-2019-18885, CVE-2019-19057, CVE-2019-19062, CVE-2019-19063,
      CVE-2019-19071, CVE-2019-19078, CVE-2019-19082, CVE-2019-19227,
      CVE-2019-19332, CVE-2019-19767, CVE-2019-19965, CVE-2019-20096,
      CVE-2019-5108, CVE-2020-7053
    

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