Ubuntu 2950-1: Samba vulnerabilities

    Date18 Apr 2016
    CategoryUbuntu
    38
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in Samba.
    ==========================================================================
    Ubuntu Security Notice USN-2950-1
    April 18, 2016
    
    samba vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 15.10
    - 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:
    
    Jouni Knuutinen discovered that Samba contained multiple flaws in the
    DCE/RPC implementation. A remote attacker could use this issue to perform
    a denial of service, downgrade secure connections by performing a man in
    the middle attack, or possibly execute arbitrary code. (CVE-2015-5370)
    
    Stefan Metzmacher discovered that Samba contained multiple flaws in the
    NTLMSSP authentication implementation. A remote attacker could use this
    issue to downgrade connections to plain text by performing a man in the
    middle attack. (CVE-2016-2110)
    
    Alberto Solino discovered that a Samba domain controller would establish a
    secure connection to a server with a spoofed computer name. A remote
    attacker could use this issue to obtain sensitive information.
    (CVE-2016-2111)
    
    Stefan Metzmacher discovered that the Samba LDAP implementation did not
    enforce integrity protection. A remote attacker could use this issue to
    hijack LDAP connections by performing a man in the middle attack.
    (CVE-2016-2112)
    
    Stefan Metzmacher discovered that Samba did not validate TLS certificates.
    A remote attacker could use this issue to spoof a Samba server.
    (CVE-2016-2113)
    
    Stefan Metzmacher discovered that Samba did not enforce SMB signing even if
    configured to. A remote attacker could use this issue to perform a man in
    the middle attack. (CVE-2016-2114)
    
    Stefan Metzmacher discovered that Samba did not enable integrity protection
    for IPC traffic. A remote attacker could use this issue to perform a man in
    the middle attack. (CVE-2016-2115)
    
    Stefan Metzmacher discovered that Samba incorrectly handled the MS-SAMR and
    MS-LSAD protocols. A remote attacker could use this flaw with a man in the
    middle attack to impersonate users and obtain sensitive information from
    the Security Account Manager database. This flaw is known as Badlock.
    (CVE-2016-2118)
    
    Samba has been updated to 4.3.8 in Ubuntu 14.04 LTS and Ubuntu 15.10.
    Ubuntu 12.04 LTS has been updated to 3.6.25 with backported security fixes.
    
    In addition to security fixes, the updated packages contain bug fixes,
    new features, and possibly incompatible changes. Configuration changes may
    be required in certain environments.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 15.10:
      samba                           2:4.3.8+dfsg-0ubuntu0.15.10.2
    
    Ubuntu 14.04 LTS:
      samba                           2:4.3.8+dfsg-0ubuntu0.14.04.2
    
    Ubuntu 12.04 LTS:
      samba                           2:3.6.25-0ubuntu0.12.04.2
    
    This update uses a new upstream release, which includes additional bug
    fixes. In general, a standard system update will make all the necessary
    changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2950-1
      CVE-2015-5370, CVE-2016-2110, CVE-2016-2111, CVE-2016-2112,
      CVE-2016-2113, CVE-2016-2114, CVE-2016-2115, CVE-2016-2118
    
    Package Information:
      https://launchpad.net/ubuntu/+source/samba/2:4.3.8+dfsg-0ubuntu0.15.10.2
      https://launchpad.net/ubuntu/+source/samba/2:4.3.8+dfsg-0ubuntu0.14.04.2
      https://launchpad.net/ubuntu/+source/samba/2:3.6.25-0ubuntu0.12.04.2
    
    
    
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