Ubuntu 3255-1: LightDM vulnerability

    Date04 Apr 2017
    CategoryUbuntu
    55
    Posted ByLinuxSecurity Advisories
    LightDM could be made to run programs as an administrator.
    ==========================================================================
    Ubuntu Security Notice USN-3255-1
    April 04, 2017
    
    lightdm vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.10
    - Ubuntu 16.04 LTS
    
    Summary:
    
    LightDM could be made to run programs as an administrator.
    
    Software Description:
    - lightdm: Display Manager
    
    Details:
    
    It was discovered that LightDM incorrectly handled home directory creation for
    guest users. A local attacker could use this issue to gain ownership of
    arbitrary directory paths and possibly gain administrative privileges.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.10:
      lightdm                         1.19.5-0ubuntu1.1
    
    Ubuntu 16.04 LTS:
      lightdm                         1.18.3-0ubuntu1.1
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-3255-1
      CVE-2017-7358
    
    Package Information:
      https://launchpad.net/ubuntu/+source/lightdm/1.19.5-0ubuntu1.1
      https://launchpad.net/ubuntu/+source/lightdm/1.18.3-0ubuntu1.1
    
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