Ubuntu 4167-1: Samba vulnerabilities

    Date29 Oct 2019
    CategoryUbuntu
    254
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in Samba.
    ==========================================================================
    Ubuntu Security Notice USN-4167-1
    October 29, 2019
    
    samba vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 19.10
    - Ubuntu 19.04
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in Samba.
    
    Software Description:
    - samba: SMB/CIFS file, print, and login server for Unix
    
    Details:
    
    Michael Hanselmann discovered that the Samba client code incorrectly
    handled path separators. If a user were tricked into connecting to a
    malicious server, a remote attacker could use this issue to cause the
    client to access local pathnames instead of network pathnames.
    (CVE-2019-10218)
    
    Simon Fonteneau and Björn Baumbach discovered that Samba incorrectly
    handled the check password script. This issue could possibly bypass custom
    password complexity checks, contrary to expectations. This issue only
    affected Ubuntu 18.04 LTS, Ubuntu 19.04, and Ubuntu 19.10. (CVE-2019-14833)
    
    Adam Xu discovered that Samba incorrectly handled the dirsync LDAP control.
    A remote attacker with "get changes" permissions could possibly use this
    issue to cause Samba to crash, resulting in a denial of service.
    (CVE-2019-14847)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 19.10:
      libsmbclient                    2:4.10.7+dfsg-0ubuntu2.2
      samba                           2:4.10.7+dfsg-0ubuntu2.2
    
    Ubuntu 19.04:
      libsmbclient                    2:4.10.0+dfsg-0ubuntu2.6
      samba                           2:4.10.0+dfsg-0ubuntu2.6
    
    Ubuntu 18.04 LTS:
      libsmbclient                    2:4.7.6+dfsg~ubuntu-0ubuntu2.13
      samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.13
    
    Ubuntu 16.04 LTS:
      libsmbclient                    2:4.3.11+dfsg-0ubuntu0.16.04.23
      samba                           2:4.3.11+dfsg-0ubuntu0.16.04.23
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4167-1
      CVE-2019-10218, CVE-2019-14833, CVE-2019-14847
    
    Package Information:
      https://launchpad.net/ubuntu/+source/samba/2:4.10.7+dfsg-0ubuntu2.2
      https://launchpad.net/ubuntu/+source/samba/2:4.10.0+dfsg-0ubuntu2.6
      https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.13
      https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.23
    
    
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