Ubuntu 2710-2: OpenSSH regression

    Date18 Aug 2015
    CategoryUbuntu
    329
    Posted ByLinuxSecurity Advisories
    USN-2710-1 introduced a regression in OpenSSH.
    ==========================================================================
    Ubuntu Security Notice USN-2710-2
    August 18, 2015
    
    openssh regression
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 15.04
    - Ubuntu 14.04 LTS
    - Ubuntu 12.04 LTS
    
    Summary:
    
    USN-2710-1 introduced a regression in OpenSSH.
    
    Software Description:
    - openssh: secure shell (SSH) for secure access to remote machines
    
    Details:
    
    USN-2710-1 fixed vulnerabilities in OpenSSH. The upstream fix for
    CVE-2015-5600 caused a regression resulting in random authentication
    failures in non-default configurations. This update fixes the problem.
    
    Original advisory details:
    
     Moritz Jodeit discovered that OpenSSH incorrectly handled usernames when
     using PAM authentication. If an additional vulnerability were discovered in
     the OpenSSH unprivileged child process, this issue could allow a remote
     attacker to perform user impersonation. (CVE number pending)
      Moritz Jodeit discovered that OpenSSH incorrectly handled context memory
     when using PAM authentication. If an additional vulnerability were
     discovered in the OpenSSH unprivileged child process, this issue could
     allow a remote attacker to bypass authentication or possibly execute
     arbitrary code. (CVE number pending)
      Jann Horn discovered that OpenSSH incorrectly handled time windows for
     X connections. A remote attacker could use this issue to bypass certain
     access restrictions. (CVE-2015-5352)
      It was discovered that OpenSSH incorrectly handled keyboard-interactive
     authentication. In a non-default configuration, a remote attacker could
     possibly use this issue to perform a brute-force password attack.
     (CVE-2015-5600)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 15.04:
      openssh-server                  1:6.7p1-5ubuntu1.3
    
    Ubuntu 14.04 LTS:
      openssh-server                  1:6.6p1-2ubuntu2.3
    
    Ubuntu 12.04 LTS:
      openssh-server                  1:5.9p1-5ubuntu1.7
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2710-2
      http://www.ubuntu.com/usn/usn-2710-1
      https://launchpad.net/bugs/1485719
    
    Package Information:
      https://launchpad.net/ubuntu/+source/openssh/1:6.7p1-5ubuntu1.3
      https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.3
      https://launchpad.net/ubuntu/+source/openssh/1:5.9p1-5ubuntu1.7
    
    
    
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