Ubuntu 2935-1: PAM vulnerabilities

    Date16 Mar 2016
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in PAM.
    Ubuntu Security Notice USN-2935-1
    March 16, 2016
    pam vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 15.10
    - Ubuntu 14.04 LTS
    - Ubuntu 12.04 LTS
    Several security issues were fixed in PAM.
    Software Description:
    - pam: Pluggable Authentication Modules
    It was discovered that the PAM pam_userdb module incorrectly used a
    case-insensitive method when comparing hashed passwords. A local attacker
    could possibly use this issue to make brute force attacks easier. This
    issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2013-7041)
    Sebastian Krahmer discovered that the PAM pam_timestamp module incorrectly
    performed filtering. A local attacker could use this issue to create
    arbitrary files, or possibly bypass authentication. This issue only
    affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-2583)
    Sebastien Macke discovered that the PAM pam_unix module incorrectly handled
    large passwords. A local attacker could possibly use this issue in certain
    environments to enumerate usernames or cause a denial of service.
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 15.10:
      libpam-modules                  1.1.8-3.1ubuntu3.1
    Ubuntu 14.04 LTS:
      libpam-modules                  1.1.8-1ubuntu2.1
    Ubuntu 12.04 LTS:
      libpam-modules                  1.1.3-7ubuntu2.1
    In general, a standard system update will make all the necessary changes.
      CVE-2013-7041, CVE-2014-2583, CVE-2015-3238
    Package Information:

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