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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:
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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