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TITLE:
FreeRADIUS OCSP Authentication Bypass Vulnerability

SECUNIA ADVISORY ID:
SA45425

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/45425/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=45425

RELEASE DATE:
2011-07-26

DISCUSS ADVISORY:
http://secunia.com/advisories/45425/#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/45425/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
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https://ca.secunia.com/?page=viewadvisory&vuln_id=45425

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 FreeRADIUS, which can be
exploited by malicious people to bypass certain security features.

The vulnerability is caused due to the OCSP implementation not
properly validating certificates, which can be exploited to
successfully authenticate using revoked certificates.

Successful exploitation requires that FreeRADIUS is configured to use
EAP-TLS with OCSP certificate validation (not default).

The vulnerability is reported in version 2.1.11.

SOLUTION:
Do not use the OCSP feature.

PROVIDED AND/OR DISCOVERED BY:
DFN-CERT

ORIGINAL ADVISORY:
https://www.dfn-cert.de/informationen/Sicherheitsbulletins/dsb-2011-01.html

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:
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