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TITLE:
Kerberos Multiple Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA43260

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43260/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43260

RELEASE DATE:
2011-02-10

DISCUSS ADVISORY:
http://secunia.com/advisories/43260/#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/43260/

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=43260

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

1) The KDC database propagation daemon (kpropd) listening process
does not properly handle the abnormal termination of worker
processes, which can be exploited to terminate the daemon by sending
specially crafted data.

Successful exploitation requires that kpropd runs in standalone mode
("-S" option).

The vulnerability is reported in krb5-1.7, krb5-1.8, and krb5-1.9.

2) An error when processing certain Kerberos principal names in the
KDC LDAP database back end can lead to file descriptor leaks, which
can be exploited to cause KDC to hang by sending specially crafted
requests.

The vulnerability is reported in krb5-1.6 and later.

3) A NULL pointer dereference error when processing certain Kerberos
principal names exists in the KDC LDAP back end, which can be
exploited to cause a crash by sending specially crafted requests.

The vulnerability is reported in krb5-1.6 and later.

4) A NULL pointer dereference error within the KDC network code can
be exploited to cause a crash by sending specially crafted requests
packets.

The vulnerability is reported in krb5-1.9.

SOLUTION:
Apply patches.

PROVIDED AND/OR DISCOVERED BY:
3) Reported by the vendor.

The vendor credits:
1) Keiichi Mori, Red Hat
2) Kevin Longfellow, Oracle
4) Zbysek Mraz, Red Hat

ORIGINAL ADVISORY:
MIT krb5 Security Advisory 2011-001:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2011-001.txt

MIT krb5 Security Advisory 2011-002:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2011-002.txt

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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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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