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TITLE:
Kerberos KDC Ticket Validation Double-Free Vulnerability

SECUNIA ADVISORY ID:
SA39420

VERIFY ADVISORY:
http://secunia.com/advisories/39420/

DESCRIPTION:
Joel Johnson has reported a vulnerability in Kerberos, which can be
exploited by malicious users to potentially compromise a vulnerable
system.

The vulnerability is caused due to an error in KDC within the
"process_tgs_req()" function in kdc/do_tgs_req.c when validating or
renewing tickets and can be exploited to trigger a double-free
condition.

Successful exploitation may allow execution of arbitrary code.

The vulnerability is reported in version krb5-1.7 and later.

SOLUTION:
Apply patch.
http://web.mit.edu/kerberos/advisories/2010-004-patch.txt

The vulnerability will also be fixed in upcoming releases of krb5-1.7
and krb5-1.8.2.

PROVIDED AND/OR DISCOVERED BY:
Joel Johnson

ORIGINAL ADVISORY:
MITKRB5-SA-2010-004:
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-004.txt

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About:
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vulnerabilities.

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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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