Public Date:
746620: CVE-2011-3149 pam (pam_env): Infinite loop by expanding certain arguments

The MITRE CVE dictionary describes this issue as:

The _expand_arg function in the pam_env module (modules/pam_env/pam_env.c) in Linux-PAM (aka pam) before 1.1.5 does not properly handle when environment variable expansion can overflow, which allows local users to cause a denial of service (CPU consumption).

Find out more about CVE-2011-3149 from the MITRE CVE dictionary dictionary and NIST NVD.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 1.2
Base Metrics AV:L/AC:H/Au:N/C:N/I:N/A:P
Access Vector Local
Access Complexity High
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux version 6 (pam) RHSA-2013:0521 2013-02-20

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 4 pam Not affected
Red Hat Enterprise Linux 5 pam Not affected


Red Hat would like to thank Kees Cook of Google ChromeOS Team for reporting this issue.