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TITLE:
OpenSSL Kerberos "kssk_keytab_is_available()" Denial of Service

SECUNIA ADVISORY ID:
SA38807

VERIFY ADVISORY:
http://secunia.com/advisories/38807/

DESCRIPTION:
A vulnerability has been reported in OpenSSL, which can be exploited
by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to the "kssk_keytab_is_available()"
function in ssl/kssl.c not checking the return value of a call to the
"krb5_sname_to_principal()" function, which can be exploited to cause
a NULL pointer dereference by e.g. sending certain cipher suites
within the client hello.

Successful exploitation requires that OpenSSL is compiled with
Kerberos support and may also depend on the Kerberos version and the
setup.

SOLUTION:
Fixed in the CVS repository.
http://cvs.openssl.org/chngview?cn=19374

PROVIDED AND/OR DISCOVERED BY:
Todd Rinaldo

ORIGINAL ADVISORY:
OpenSSL:
http://cvs.openssl.org/chngview?cn=19374

Red Hat:
https://bugzilla.redhat.com/show_bug.cgi?id=567711
https://bugzilla.redhat.com/show_bug.cgi?id=569774
http://www.openwall.com/lists/oss-security/2010/03/03/5

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