Ubuntu 2753-3: LXC regression

    Date05 Oct 2015
    CategoryUbuntu
    65
    Posted ByLinuxSecurity Advisories
    USN-2753-1 introduced a regression in LXC.
    ==========================================================================
    Ubuntu Security Notice USN-2753-3
    October 05, 2015
    
    lxc regression
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 LTS
    
    Summary:
    
    USN-2753-1 introduced a regression in LXC.
    
    Software Description:
    - lxc: Linux Containers userspace tools
    
    Details:
    
    USN-2753-1 fixed a vulnerability in LXC. The update caused a regression
    that prevented some containers from starting. This regression only
    affected containers that had a path that contained a '/./' directory
    specified as a bind mount target in their configuration file. This
    update fixes the problem. We apologize for the inconvenience.
    
    Original advisory details:
    
     Roman Fiedler discovered a directory traversal flaw in lxc-start. A local
     attacker with access to an LXC container could exploit this flaw to run
     programs inside the container that are not confined by AppArmor or expose
     unintended files in the host to the container.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 LTS:
      liblxc1                         1.0.7-0ubuntu0.7
      lxc                             1.0.7-0ubuntu0.7
      lxc-dev                         1.0.7-0ubuntu0.7
      lxc-templates                   1.0.7-0ubuntu0.7
      lxc-tests                       1.0.7-0ubuntu0.7
      python3-lxc                     1.0.7-0ubuntu0.7
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2753-3
      http://www.ubuntu.com/usn/usn-2753-1
      https://launchpad.net/bugs/1501491
    
    Package Information:
      https://launchpad.net/ubuntu/+source/lxc/1.0.7-0ubuntu0.7
    
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