Ubuntu 2710-1: OpenSSH vulnerabilities

    Date14 Aug 2015
    CategoryUbuntu
    378
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in OpenSSH.
    ==========================================================================
    Ubuntu Security Notice USN-2710-1
    August 14, 2015
    
    openssh vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 15.04
    - 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:
    
    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                  1:6.7p1-5ubuntu1.2
    
    Ubuntu 14.04 LTS:
      openssh-server                  1:6.6p1-2ubuntu2.2
    
    Ubuntu 12.04 LTS:
      openssh-server                  1:5.9p1-5ubuntu1.6
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2710-1
      CVE-2015-5352, CVE-2015-5600
    
    Package Information:
      https://launchpad.net/ubuntu/+source/openssh/1:6.7p1-5ubuntu1.2
      https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.2
      https://launchpad.net/ubuntu/+source/openssh/1:5.9p1-5ubuntu1.6
    
    
    
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