Ubuntu 1237-1: PAM vulnerabilities

    Date24 Oct 2011
    CategoryUbuntu
    140
    Posted ByLinuxSecurity Advisories
    PAM could be made to crash or run programs as an administrator.
    ==========================================================================
    Ubuntu Security Notice USN-1237-1
    October 24, 2011
    
    pam vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.10
    - Ubuntu 11.04
    - Ubuntu 10.10
    - Ubuntu 10.04 LTS
    - Ubuntu 8.04 LTS
    
    Summary:
    
    PAM could be made to crash or run programs as an administrator.
    
    Software Description:
    - pam: Pluggable Authentication Modules
    
    Details:
    
    Kees Cook discovered that the PAM pam_env module incorrectly handled
    certain malformed environment files. A local attacker could use this flaw
    to cause a denial of service, or possibly gain privileges. The default
    compiler options for affected releases should reduce the vulnerability to a
    denial of service. (CVE-2011-3148)
    
    Kees Cook discovered that the PAM pam_env module incorrectly handled
    variable expansion. A local attacker could use this flaw to cause a denial
    of service. (CVE-2011-3149)
    
    Stephane Chazelas discovered that the PAM pam_motd module incorrectly
    cleaned the environment during execution of the motd scripts. In certain
    environments, a local attacker could use this to execute arbitrary code
    as root, and gain privileges.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.10:
      libpam-modules                  1.1.3-2ubuntu2.1
    
    Ubuntu 11.04:
      libpam-modules                  1.1.2-2ubuntu8.4
    
    Ubuntu 10.10:
      libpam-modules                  1.1.1-4ubuntu2.4
    
    Ubuntu 10.04 LTS:
      libpam-modules                  1.1.1-2ubuntu5.4
    
    Ubuntu 8.04 LTS:
      libpam-modules                  0.99.7.1-5ubuntu6.5
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-1237-1
      CVE-2011-3148, CVE-2011-3149, CVE-2011-3628
    
    Package Information:
      https://launchpad.net/ubuntu/+source/pam/1.1.3-2ubuntu2.1
      https://launchpad.net/ubuntu/+source/pam/1.1.2-2ubuntu8.4
      https://launchpad.net/ubuntu/+source/pam/1.1.1-4ubuntu2.4
      https://launchpad.net/ubuntu/+source/pam/1.1.1-2ubuntu5.4
      https://launchpad.net/ubuntu/+source/pam/0.99.7.1-5ubuntu6.5
    
    
    
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