From: Secunia Security Advisories (sec-advsecunia.com)
Date: Fri Apr 05 2013 - 15:20:02 CDT

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TITLE:
GSI-OpenSSH PAM_USER Bypass Security Issue

SECUNIA ADVISORY ID:
SA52890

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/52890/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=52890

RELEASE DATE:
2013-04-05

DISCUSS ADVISORY:
http://secunia.com/advisories/52890/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/52890/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=52890

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A security issue has been reported in GSI-OpenSSH, which can be
exploited by malicious users to bypass certain security
restrictions.

The security issue is caused due to a memory management error within
auth-pam.c and can be exploited to log in to a system as a different
user than specified by PAM_USER.

Successful exploitation requires that sshd_config contains
"PermitPAMUserChange yes" (not default) and /etc/pam.d/sshd (or
equivalent) is configured with a PAM module that modifies PAM_USER.

The security issue is reported in versions prior to 5.5 and GSI patch
for OpenSSH versions 20090831-20120903.

SOLUTION:
Update to version 5.6 or apply patch. Please see the vendor's
advisory for details.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Venkatesh Yekkirala.

ORIGINAL ADVISORY:
http://grid.ncsa.illinois.edu/ssh/pamuserchange-2013-01.adv

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
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clicking the link.
Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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