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Ubuntu Security Notice USN-1237-1

Ubuntu Security Notice USN-1237-1
Posted Oct 25, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1237-1 - 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. 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. Various other issues were also addressed.

tags | advisory, denial of service, local
systems | linux, ubuntu
advisories | CVE-2011-3148, CVE-2011-3149, CVE-2011-3628
MD5 | 835e5fb3e9b17839c10166ea59e4b3b1

Ubuntu Security Notice USN-1237-1

Change Mirror Download
==========================================================================
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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