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TITLE:
Kerberos GSS-API NULL Pointer Dereference Vulnerability

SECUNIA ADVISORY ID:
SA39762

VERIFY ADVISORY:
http://secunia.com/advisories/39762/

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
when processing certain Kerberos AP-REQ authenticators, which can be
exploited to cause a crash in e.g. kadmind or other applications
linked against the GSS-API library by sending an AP-REQ authenticator
with a missing checksum field.

The vulnerability is reported in all releases including krb5-1.8.1.

SOLUTION:
Apply patches. Reportedly, the vulnerability will be fixed in the
upcoming krb5-1.8.2 release and an upcoming krb5-1.7 series release.

Patch for krb5-1.6:
http://web.mit.edu/kerberos/advisories/2010-005-patch_r16.txt.asc

Patch for krb5-1.7 and krb5-1.8.1:
http://web.mit.edu/kerberos/advisories/2010-005-patch.txt.asc

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Shawn Emery, Oracle.

ORIGINAL ADVISORY:
MITKRB5-SA-2010-005:
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-005.txt

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About:
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