Ubuntu 3968-2: Sudo vulnerability

    Date29 May 2019
    CategoryUbuntu
    22
    Posted ByLinuxSecurity Advisories
    Sudo could be made to overwrite files if it received a specially crafted input.
    ==========================================================================
    Ubuntu Security Notice USN-3968-2
    May 29, 2019
    
    sudo vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    
    Summary:
    
    Sudo could be made to overwrite files if it received a specially
    crafted input.
    
    Software Description:
    - sudo: Provide limited super user privileges to specific users
    
    Details:
    
    USN-3968-1 fixed a vulnerability in Sudo. This update provides
    the corresponding update for Ubuntu 14.04 ESM.
    
    Original advisory details:
    
     It was discovered that Sudo did not properly parse the contents of
     /proc/[pid]/stat when attempting to determine its controlling tty. A
     local attacker in some configurations could possibly use this to
     overwrite any file on the filesystem, bypassing intended permissions.
     (CVE-2017-1000368)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      sudo                            1.8.9p5-1ubuntu1.5+esm1
      sudo-ldap                       1.8.9p5-1ubuntu1.5+esm1
    
    In general, a standard system update will make all the necessary
    changes.
    
    References:
      https://usn.ubuntu.com/usn/usn-3968-2
      https://usn.ubuntu.com/usn/usn-3968-1
      CVE-2017-1000368
    
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