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TITLE:
Microsoft Windows Active Directory LDAPS Authentication Bypass

SECUNIA ADVISORY ID:
SA46755

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46755/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46755

RELEASE DATE:
2011-11-08

DISCUSS ADVISORY:
http://secunia.com/advisories/46755/#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/46755/

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=46755

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 Microsoft Windows, which can be
exploited by malicious people to bypass certain security
restrictions.

The vulnerability is caused due to an error in Active Directory when
configured to use LDAP over SSL (not default setting) as it fails to
validate the revocation status of an SSL certificate against the CRL
(Certificate Revocation List) associated with the domain account.
This can be exploited to authenticate to the Active Directory domain
using a revoked certificate.

SOLUTION:
Apply patches.

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

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Xavier Lassoie and Sébastien Godard, Autosécurité.

ORIGINAL ADVISORY:
MS11-086 (KB2601626, KB2616310, KB2630837):
http://technet.microsoft.com/en-us/security/bulletin/ms11-086

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.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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