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TITLE:
Kerberos KDC "process_tgs_req()" NULL Pointer Dereference Denial of
Service Vulnerability

SECUNIA ADVISORY ID:
SA47124

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47124/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47124

RELEASE DATE:
2011-12-07

DISCUSS ADVISORY:
http://secunia.com/advisories/47124/#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/47124/

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=47124

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 Kerberos, which can be exploited
by malicious users to cause a DoS (Denial of Service).

The vulnerability is caused due to a NULL pointer dereference error
within the "process_tgs_req()" function (src/kdc/do_tgs_req.c) and
can be exploited to crash the KDC daemon by sending specially crafted
TGS (Ticket Granting Service) requests.

The vulnerability is reported in the krb5-1.9 branch. Prior branches
are not affected.

SOLUTION:
Apply the patch.

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

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Simo Sorce.

ORIGINAL ADVISORY:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2011-007.txt

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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Definitions: (Criticality, Where etc.)
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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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