Ubuntu 1238-1: Puppet vulnerability

    Date24 Oct 2011
    CategoryUbuntu
    72
    Posted ByLinuxSecurity Advisories
    The Puppet master server could be impersonated in certain configurations.
    ==========================================================================
    Ubuntu Security Notice USN-1238-1
    October 24, 2011
    
    puppet vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.10
    - Ubuntu 11.04
    - Ubuntu 10.10
    - Ubuntu 10.04 LTS
    
    Summary:
    
    The Puppet master server could be impersonated in certain configurations.
    
    Software Description:
    - puppet: Centralized configuration management
    
    Details:
    
    It was discovered that Puppet incorrectly handled the non-default
    "certdnsnames" option when generating certificates. If this setting was
    added to puppet.conf, the puppet master’s DNS alt names were added to the
    X.509 Subject Alternative Name field of all certificates, not just the
    puppet master’s certificate. An attacker that has an incorrect agent
    certificate in his possession can use it to impersonate the puppet master
    in a man-in-the-middle attack.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.10:
      puppet-common                   2.7.1-1ubuntu3.2
    
    Ubuntu 11.04:
      puppet-common                   2.6.4-2ubuntu2.5
    
    Ubuntu 10.10:
      puppet-common                   2.6.1-0ubuntu2.4
    
    Ubuntu 10.04 LTS:
      puppet-common                   0.25.4-2ubuntu6.5
    
    In general, a standard system update will make all the necessary changes.
    
    If your puppet master's puppet.conf file has ever contained the
    "certdnsnames" setting, you must reissue your site certificates, or apply
    another mitigation technique. Please see the upstream advisory for more
    information:
    
    http://puppetlabs.com/security/cve/cve-2011-3872/
    
    References:
      http://www.ubuntu.com/usn/usn-1238-1
      CVE-2011-3872
    
    Package Information:
      https://launchpad.net/ubuntu/+source/puppet/2.7.1-1ubuntu3.2
      https://launchpad.net/ubuntu/+source/puppet/2.6.4-2ubuntu2.5
      https://launchpad.net/ubuntu/+source/puppet/2.6.1-0ubuntu2.4
      https://launchpad.net/ubuntu/+source/puppet/0.25.4-2ubuntu6.5
    
    
    
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