Ubuntu 4186-2: Linux kernel (Xenial HWE) vulnerabilities

    Date12 Nov 2019
    CategoryUbuntu
    107
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4186-2
    November 13, 2019
    
    linux-lts-xenial, linux-aws 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-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-4186-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
    14.04 ESM.
    
    Stephan van Schaik, Alyssa Milburn, Sebastian Österlund, Pietro Frigo,
    Kaveh Razavi, Herbert Bos, Cristiano Giuffrida, Giorgi Maisuradze, Moritz
    Lipp, Michael Schwarz, Daniel Gruss, and Jo Van Bulck discovered that Intel
    processors using Transactional Synchronization Extensions (TSX) could
    expose memory contents previously stored in microarchitectural buffers to a
    malicious process that is executing on the same CPU core. A local attacker
    could use this to expose sensitive information. (CVE-2019-11135)
    
    It was discovered that the Intel i915 graphics chipsets allowed userspace
    to modify page table entries via writes to MMIO from the Blitter Command
    Streamer and expose kernel memory information. A local attacker could use
    this to expose sensitive information or possibly elevate privileges.
    (CVE-2019-0155)
    
    Deepak Gupta discovered that on certain Intel processors, the Linux kernel
    did not properly perform invalidation on page table updates by virtual
    guest operating systems. A local attacker in a guest VM could use this to
    cause a denial of service (host system crash). (CVE-2018-12207)
    
    It was discovered that the Intel i915 graphics chipsets could cause a
    system hang when userspace performed a read from GT memory mapped input
    output (MMIO) when the product is in certain low power states. A local
    attacker could use this to cause a denial of service. (CVE-2019-0154)
    
    Hui Peng discovered that the Atheros AR6004 USB Wi-Fi device driver for the
    Linux kernel did not properly validate endpoint descriptors returned by the
    device. A physically proximate attacker could use this to cause a denial of
    service (system crash). (CVE-2019-15098)
    
    Ori Nimron discovered that the AX25 network protocol implementation in the
    Linux kernel did not properly perform permissions checks. A local attacker
    could use this to create a raw socket. (CVE-2019-17052)
    
    Ori Nimron discovered that the IEEE 802.15.4 Low-Rate Wireless network
    protocol implementation in the Linux kernel did not properly perform
    permissions checks. A local attacker could use this to create a raw socket.
    (CVE-2019-17053)
    
    Ori Nimron discovered that the Appletalk network protocol implementation in
    the Linux kernel did not properly perform permissions checks. A local
    attacker could use this to create a raw socket. (CVE-2019-17054)
    
    Ori Nimron discovered that the modular ISDN network protocol implementation
    in the Linux kernel did not properly perform permissions checks. A local
    attacker could use this to create a raw socket. (CVE-2019-17055)
    
    Ori Nimron discovered that the Near field Communication (NFC) network
    protocol implementation in the Linux kernel did not properly perform
    permissions checks. A local attacker could use this to create a raw socket.
    (CVE-2019-17056)
    
    Nico Waisman discovered that a buffer overflow existed in the Realtek Wi-Fi
    driver for the Linux kernel when handling Notice of Absence frames. A
    physically proximate attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2019-17666)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      linux-image-4.4.0-1058-aws      4.4.0-1058.62
      linux-image-4.4.0-168-generic   4.4.0-168.197~14.04.1
      linux-image-4.4.0-168-generic-lpae  4.4.0-168.197~14.04.1
      linux-image-4.4.0-168-lowlatency  4.4.0-168.197~14.04.1
      linux-image-4.4.0-168-powerpc-e500mc  4.4.0-168.197~14.04.1
      linux-image-4.4.0-168-powerpc-smp  4.4.0-168.197~14.04.1
      linux-image-4.4.0-168-powerpc64-emb  4.4.0-168.197~14.04.1
      linux-image-4.4.0-168-powerpc64-smp  4.4.0-168.197~14.04.1
      linux-image-aws                 4.4.0.1058.59
      linux-image-generic-lpae-lts-xenial  4.4.0.168.147
      linux-image-generic-lts-xenial  4.4.0.168.147
      linux-image-lowlatency-lts-xenial  4.4.0.168.147
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.168.147
      linux-image-powerpc-smp-lts-xenial  4.4.0.168.147
      linux-image-powerpc64-emb-lts-xenial  4.4.0.168.147
      linux-image-powerpc64-smp-lts-xenial  4.4.0.168.147
      linux-image-virtual-lts-xenial  4.4.0.168.147
    
    Please note that mitigating the TSX (CVE-2019-11135) and i915
    (CVE-2019-0154) issues requires corresponding microcode and graphics
    firmware updates respectively.
    
    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/4186-2
      https://usn.ubuntu.com/4186-1
      CVE-2018-12207, CVE-2019-0154, CVE-2019-0155, CVE-2019-11135,
      CVE-2019-15098, CVE-2019-17052, CVE-2019-17053, CVE-2019-17054,
      CVE-2019-17055, CVE-2019-17056, CVE-2019-17666,
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/TAA_MCEPSC_i915
    
    
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