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USN-1237-1: PAM vulnerabilities

24 October 2011

PAM could be made to crash or run programs as an administrator.

Releases

Packages

  • 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 8.04
Ubuntu 11.10
Ubuntu 11.04
Ubuntu 10.10
Ubuntu 10.04

In general, a standard system update will make all the necessary changes.