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    Ubuntu 4510-1: Samba vulnerability

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    Samba would allow unintended access to files over the network.
    ==========================================================================
    Ubuntu Security Notice USN-4510-1
    September 17, 2020
    
    samba vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Samba would allow unintended access to files over the network.
    
    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.
    
    This update fixes the issue by changing the "server schannel" setting to
    default to "yes", instead of "auto", which will force a secure netlogon
    channel. This may result in compatibility issues with older devices. A
    future update may allow a finer-grained control over this setting.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.19
    
    Ubuntu 16.04 LTS:
      samba                           2:4.3.11+dfsg-0ubuntu0.16.04.30
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4510-1
      CVE-2020-1472
    
    Package Information:
      https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.19
      https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.30
    
    

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