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TITLE:
Yubico PAM Module NULL Password Authentication Bypass Vulnerability

SECUNIA ADVISORY ID:
SA46689

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46689/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46689

RELEASE DATE:
2011-11-07

DISCUSS ADVISORY:
http://secunia.com/advisories/46689/#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/46689/

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=46689

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 vulnerability has been reported in the Yubico PAM Module, which can
be exploited by malicious people to bypass certain security features.

The vulnerability is caused due to an error within the
"pam_sm_authenticate()" function in pam_yubico.c, which can be
exploited to bypass the authentication mechanism by providing a NULL
password.

Successful exploitation may require that the module is configured as
"sufficient" in the PAM configuration and the "use_first_pass" option
is not used.

The vulnerability is reported in versions prior to versions 2.4
through 2.7.

SOLUTION:
Update to version 2.8.

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

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Nanakos Chrysostomos.

ORIGINAL ADVISORY:
http://groups.google.com/group/yubico-devel/browse_thread/thread/3f179ec0e6845deb

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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