Ubuntu 3777-3: Linux kernel (Azure) vulnerabilities

    Date23 Oct 2018
    CategoryUbuntu
    3813
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3777-3
    October 23, 2018
    
    linux-azure vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-azure: Linux kernel for Microsoft Azure Cloud systems
    
    Details:
    
    USN-3777-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
    %LTS. This update provides the corresponding updates for the
    Linux kernel for Azure Cloud systems.
    
    Jann Horn discovered that the vmacache subsystem did not properly handle
    sequence number overflows, leading to a use-after-free vulnerability. A
    local attacker could use this to cause a denial of service (system crash)
    or execute arbitrary code. (CVE-2018-17182)
    
    It was discovered that the paravirtualization implementation in the Linux
    kernel did not properly handle some indirect calls, reducing the
    effectiveness of Spectre v2 mitigations for paravirtual guests. A local
    attacker could use this to expose sensitive information. (CVE-2018-15594)
    
    It was discovered that microprocessors utilizing speculative execution and
    prediction of return addresses via Return Stack Buffer (RSB) may allow
    unauthorized memory reads via sidechannel attacks. An attacker could use
    this to expose sensitive information. (CVE-2018-15572)
    
    Jann Horn discovered that microprocessors utilizing speculative execution
    and branch prediction may allow unauthorized memory reads via sidechannel
    attacks. This flaw is known as Spectre. A local attacker could use this to
    expose sensitive information, including kernel memory. (CVE-2017-5715)
    
    It was discovered that a stack-based buffer overflow existed in the iSCSI
    target implementation of the Linux kernel. A remote attacker could use this
    to cause a denial of service (system crash). (CVE-2018-14633)
    
    Jann Horn and Ken Johnson discovered that microprocessors utilizing
    speculative execution of a memory read may allow unauthorized memory reads
    via a sidechannel attack. This flaw is known as Spectre Variant 4. A local
    attacker could use this to expose sensitive information, including kernel
    memory. (CVE-2018-3639)
    
    It was discovered that a memory leak existed in the IRDA subsystem of the
    Linux kernel. A local attacker could use this to cause a denial of service
    (kernel memory exhaustion). (CVE-2018-6554)
    
    It was discovered that a use-after-free vulnerability existed in the IRDA
    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-2018-6555)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-1025-azure   4.15.0-1025.26
      linux-image-azure               4.15.0.1025.25
    
    Ubuntu 16.04 LTS:
      linux-image-4.15.0-1025-azure   4.15.0-1025.26~16.04.1
      linux-image-azure               4.15.0.1025.31
    
    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-3777-3
      https://usn.ubuntu.com/usn/usn-3777-1
      CVE-2017-5715, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594,
      CVE-2018-17182, CVE-2018-3639, CVE-2018-6554, CVE-2018-6555
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1025.26
      https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1025.26~16.04.1
    
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