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TITLE:
Kerberos "spnego_gss_accept_sec_context()" Denial of Service

SECUNIA ADVISORY ID:
SA34347

VERIFY ADVISORY:
http://secunia.com/advisories/34347/

DESCRIPTION:
A vulnerability has been reported in Kerberos 5, 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
in the "spnego_gss_accept_sec_context()" function in
"src/lib/gssapi/spnego/spnego_mech.c". This can be exploited to e.g.
crash the daemon by sending a "NegTokenInit" token with specially
crafted ContextFlags.

The vulnerability is reported in version 1.6.3. Other versions may
also be affected.

SOLUTION:
Fixed in the SVN repository.
http://src.mit.edu/fisheye/browse/krb5/trunk/src/lib/gssapi/spnego/spnego_mech.c?r1=21875&r2=22084

PROVIDED AND/OR DISCOVERED BY:
Richard Evans

ORIGINAL ADVISORY:
http://krbdev.mit.edu/rt/Ticket/Display.html?user=guest&pass=guest&id=6402

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