Ubuntu 3976-4: Samba vulnerability

    Date27 May 2019
    CategoryUbuntu
    21
    Posted ByLinuxSecurity Advisories
    USN-3976-1 introduced a regression in Samba.
    ==========================================================================
    Ubuntu Security Notice USN-3976-4
    May 27, 2019
    
    samba vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    
    Summary:
    
    USN-3976-1 introduced a regression in Samba.
    
    Software Description:
    - samba: SMB/CIFS file, print, and login server for Unix
    
    Details:
    
    USN-3976-1 fixed a vulnerability in Samba. The update introduced a
    regression causing Samba to occasionally crash. This update fixes the
    problem.
    
    Original advisory details:
    
     Isaac Boukris and Andrew Bartlett discovered that Samba incorrectly
     checked S4U2Self packets. In certain environments, a remote attacker
     could possibly use this issue to escalate privileges.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      samba                           2:4.3.11+dfsg-0ubuntu0.14.04.20+esm2
    
    In general, a standard system update will make all the necessary
    changes.
    
    References:
      https://usn.ubuntu.com/usn/usn-3976-4
      https://usn.ubuntu.com/usn/usn-3976-1
      https://launchpad.net/bugs/1827924
    
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