Ubuntu 3833-1: Linux kernel (AWS) vulnerabilities

    Date30 Nov 2018
    CategoryUbuntu
    2360
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3833-1
    November 30, 2018
    
    linux-aws vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    
    Details:
    
    Jann Horn discovered that the Linux kernel mishandles mapping UID or GID
    ranges inside nested user namespaces in some situations. A local attacker
    could use this to bypass access controls on resources outside the
    namespace. (CVE-2018-18955)
    
    Philipp Wendler discovered that the overlayfs implementation in the Linux
    kernel did not properly verify the directory contents permissions from
    within a unprivileged user namespace. A local attacker could use this to
    expose sensitive information (protected file names). (CVE-2018-6559)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-1029-aws     4.15.0-1029.30
      linux-image-aws                 4.15.0.1029.29
    
    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-3833-1
      CVE-2018-18955, CVE-2018-6559
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1029.30
    
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