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TITLE:
Kerberos KDC Multiple Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA46494

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46494/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46494

RELEASE DATE:
2011-10-21

DISCUSS ADVISORY:
http://secunia.com/advisories/46494/#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/46494/

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=46494

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:
Multiple vulnerabilities have been reported in Kerberos, which can be
exploited by malicious people to cause a DoS (Denial of Service).

1) A NULL-pointer dereference error in the
"krb5_ldap_get_principal()" function can be exploited to crash the
KDC daemon.

Successful exploitation of this vulnerability requires KDC to be
configured to use a LDAP back end (not a default configuration).

This vulnerability is reported in krb5-1.9 and later only.

2) An assertion error in the "krb5_ldap_lockout_audit()" and
"krb5_db2_lockout_audit()" functions can be exploited to crash the
KDC daemon.

3) A NULL-pointer dereference error in the "lookup_lockout_policy()"
function can be exploited to crash the KDC daemon.

Vulnerabilities #2 and #3 are reported in krb5-1.8 and later.

SOLUTION:
Apply patches (fixes are scheduled for the upcoming release of
krb5-1.8.x and krb5-1.9.x).

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

PROVIDED AND/OR DISCOVERED BY:
1) The vendor credits Nalin Dahyabhai and Andrej Ota.
1) Independently reported by Kyle Moffett in a Debian bug report.
2) Reported by Mark Deneen in a Ubuntu bug report.
3) Reported by the vendor.

ORIGINAL ADVISORY:
MITKRB5-SA-2011-006:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2011-006.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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http://secunia.com/advisories/secunia_security_advisories/

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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