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Ubuntu 11.10 PAM Denial of Service: USN-1237-1 Critical Threat

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: https://ubuntu.com/security/notices/USN-1237-1 CVE-2011-3148, CVE-2011-3149, CVE-2011-3628 PackageInformation: 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 . PAM vulnerabilities in Ubuntu pose serious security threats across multiple releases, allowing unauthorized access through exploitation of the authentication process and privilege escalation.. PAM Issues, Privilege Risks, Ubuntu Security Updates. . Severity: Critical. LinuxSecurity.com Team

Oct 24, 2011 •Critical Ubuntu