Ubuntu 8.04 LTS / 10.04 LTS / 10.10 / 11.04 / 11.10 : pam vulnerabilities (USN-1237-1)

Ubuntu Security Notice (C) 2011-2016 Canonical, Inc. / NASL script (C) 2011-2016 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing a security-related patch.

Description :

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.

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

Solution :

Update the affected libpam-modules package.

Risk factor :

Medium / CVSS Base Score : 6.9
(CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.7
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 56629 ()

Bugtraq ID:

CVE ID: CVE-2011-3148
CVE-2011-3149
CVE-2011-3628

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