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    Ubuntu 4559-1: Samba update

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    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
    Several security improvements were added to Samba.
    Software Description:
    - samba: SMB/CIFS file, print, and login server for Unix
    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
    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.
    Package Information:

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