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    Ubuntu 4559-1: Samba update

    Date
    121
    Posted By
    Several security improvements were added to Samba.
    ==========================================================================
    Ubuntu Security Notice USN-4559-1
    September 30, 2020
    
    samba update
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 20.04 LTS
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security improvements were added to Samba.
    
    Software Description:
    - samba: SMB/CIFS file, print, and login server for Unix
    
    Details:
    
    Tom Tervoort discovered that the Netlogon protocol implemented by Samba
    incorrectly handled the authentication scheme. A remote attacker could use
    this issue to forge an authentication token and steal the credentials of
    the domain admin.
    
    While a previous security update fixed the issue by changing the "server
    schannel" setting to default to "yes", instead of "auto", which forced a
    secure netlogon channel, this update provides additional improvements.
    
    For compatibility reasons with older devices, Samba now allows specifying
    an insecure netlogon configuration per machine. See the following link for
    examples: https://www.samba.org/samba/security/CVE-2020-1472.html
    
    In addition, this update adds additional server checks for the protocol
    attack in the client-specified challenge to provide some protection when
    'server schannel = no/auto' and avoid the false-positive results when
    running the proof-of-concept exploit.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 20.04 LTS:
      samba                           2:4.11.6+dfsg-0ubuntu1.5
    
    Ubuntu 18.04 LTS:
      samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.20
    
    Ubuntu 16.04 LTS:
      samba                           2:4.3.11+dfsg-0ubuntu0.16.04.31
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4559-1
      CVE-2020-1472
    
    Package Information:
      https://launchpad.net/ubuntu/+source/samba/2:4.11.6+dfsg-0ubuntu1.5
      https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.20
      https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.31
    
    

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