Ubuntu 3158-1: Samba vulnerabilities

    Date19 Dec 2016
    CategoryUbuntu
    40
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in Samba.
    ==========================================================================
    Ubuntu Security Notice USN-3158-1
    December 19, 2016
    
    samba vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.10
    - Ubuntu 16.04 LTS
    - Ubuntu 14.04 LTS
    - Ubuntu 12.04 LTS
    
    Summary:
    
    Several security issues were fixed in Samba.
    
    Software Description:
    - samba: SMB/CIFS file, print, and login server for Unix
    
    Details:
    
    Frederic Besler and others discovered that the ndr_pull_dnsp_nam
    function in Samba contained an integer overflow. An authenticated
    attacker could use this to gain administrative privileges. This issue
    only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 16.10.
    (CVE-2016-2123)
    
    Simo Sorce discovered that that Samba clients always requested
    a forwardable ticket when using Kerberos authentication. An
    attacker could use this to impersonate an authenticated user or
    service. (CVE-2016-2125)
    
    Volker Lendecke discovered that Kerberos PAC validation implementation
    in Samba contained multiple vulnerabilities. An authenticated attacker
    could use this to cause a denial of service or gain administrative
    privileges. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04
    LTS, and Ubuntu 16.10. (CVE-2016-2126)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.10:
      libsmbclient                    2:4.4.5+dfsg-2ubuntu5.2
      samba                           2:4.4.5+dfsg-2ubuntu5.2
      winbind                         2:4.4.5+dfsg-2ubuntu5.2
    
    Ubuntu 16.04 LTS:
      libsmbclient                    2:4.3.11+dfsg-0ubuntu0.16.04.3
      samba                           2:4.3.11+dfsg-0ubuntu0.16.04.3
      winbind                         2:4.3.11+dfsg-0ubuntu0.16.04.3
    
    Ubuntu 14.04 LTS:
      libsmbclient                    2:4.3.11+dfsg-0ubuntu0.14.04.4
      samba                           2:4.3.11+dfsg-0ubuntu0.14.04.4
      winbind                         2:4.3.11+dfsg-0ubuntu0.14.04.4
    
    Ubuntu 12.04 LTS:
      libsmbclient                    2:3.6.25-0ubuntu0.12.04.5
      samba                           2:3.6.25-0ubuntu0.12.04.5
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-3158-1
      CVE-2016-2123, CVE-2016-2125, CVE-2016-2126
    
    Package Information:
      https://launchpad.net/ubuntu/+source/samba/2:4.4.5+dfsg-2ubuntu5.2
      https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.3
      https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.14.04.4
      https://launchpad.net/ubuntu/+source/samba/2:3.6.25-0ubuntu0.12.04.5
    
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