Ubuntu 2966-1: OpenSSH vulnerabilities

    Date09 May 2016
    CategoryUbuntu
    43
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in OpenSSH.
    ==========================================================================
    Ubuntu Security Notice USN-2966-1
    May 09, 2016
    
    openssh 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 OpenSSH.
    
    Software Description:
    - openssh: secure shell (SSH) for secure access to remote machines
    
    Details:
    
    Shayan Sadigh discovered that OpenSSH incorrectly handled environment files
    when the UseLogin feature is enabled. A local attacker could use this issue
    to gain privileges. (CVE-2015-8325)
    
    Ben Hawkes discovered that OpenSSH incorrectly handled certain network
    traffic. A remote attacker could possibly use this issue to cause OpenSSH
    to crash, resulting in a denial of service. This issue only applied to
    Ubuntu 15.10. (CVE-2016-1907)
    
    Thomas Hoger discovered that OpenSSH incorrectly handled untrusted X11
    forwarding when the SECURITY extension is disabled. A connection configured
    as being untrusted could get switched to trusted in certain scenarios,
    contrary to expectations. (CVE-2016-1908)
    
    It was discovered that OpenSSH incorrectly handled certain X11 forwarding
    data. A remote authenticated attacker could possibly use this issue to
    bypass certain intended command restrictions. (CVE-2016-3115)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 15.10:
      openssh-server                  1:6.9p1-2ubuntu0.2
    
    Ubuntu 14.04 LTS:
      openssh-server                  1:6.6p1-2ubuntu2.7
    
    Ubuntu 12.04 LTS:
      openssh-server                  1:5.9p1-5ubuntu1.9
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2966-1
      CVE-2015-8325, CVE-2016-1907, CVE-2016-1908, CVE-2016-3115
    
    Package Information:
      https://launchpad.net/ubuntu/+source/openssh/1:6.9p1-2ubuntu0.2
      https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.7
      https://launchpad.net/ubuntu/+source/openssh/1:5.9p1-5ubuntu1.9
    
    
    
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