Multiple vulnerabilities in git.kernel linux-pam

Published: 2012-07-22 | Updated: 2023-05-09

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2011-3148 CVE-2011-3149
CWE-ID	CWE-121 CWE-119
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	linux-pam Other software / Other software solutions
Vendor	git.kernel.org

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Stack-based buffer overflow

EUVDB-ID: #VU43802

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-3148

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the _assemble_line() function in modules/pam_env/pam_env.c when processing a long string of white spaces at the beginning of the ~/.pam_environment file. A local user can trigger a stack-based buffer overflow and execute arbitrary code on the target system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

linux-pam: 0.99.1.0 - 1.1.4

External links

http://git.fedorahosted.org/git/?p=linux-pam.git;a=commitdiff;h=caf5e7f61c8d9288daa49b4f61962e6b1239121d
http://secunia.com/advisories/46583
http://secunia.com/advisories/49711
http://security.gentoo.org/glsa/glsa-201206-31.xml
http://www.ubuntu.com/usn/USN-1237-1
http://bugs.launchpad.net/ubuntu/+source/pam/+bug/874469

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Buffer overflow

EUVDB-ID: #VU43803

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-3149

CWE-ID: CWE-119 - Memory corruption