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    Ubuntu 4454-2: Samba vulnerability

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    Samba could be made to crash if it received specially crafted network traffic.
    ==========================================================================
    Ubuntu Security Notice USN-4454-2
    August 10, 2020
    
    samba vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Samba could be made to crash if it received specially crafted network
    traffic.
    
    Software Description:
    - samba: SMB/CIFS file, print, and login server for Unix
    
    Details:
    
    USN-4454-1 fixed a vulnerability in Samba. This update provides
    the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
    
    Original advisory details:
    
     Martin von Wittich and Wilko Meyer discovered that Samba incorrectly
     handled certain empty UDP packets when being used as a AD DC NBT server. A
     remote attacker could possibly use this issue to cause Samba to crash,
     resulting in a denial of service.
    
    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+esm8
    
    Ubuntu 12.04 ESM:
      samba                           2:3.6.25-0ubuntu0.12.04.21
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4454-2
      https://usn.ubuntu.com/4454-1
      CVE-2020-14303
    

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