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Vigil@nce - MIT krb5: NULL pointer dereference via GSSAPI

August 2014 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can force a NULL pointer to be dereferenced in the
server process Kerberos, in order to trigger a denial of service.

Impacted products: Fedora, openSUSE, Ubuntu

Severity: 2/4

Creation date: 11/08/2014

DESCRIPTION OF THE VULNERABILITY

During an authentication with Kerberos, in the protocol step named
SPNEGO, the client send a packet with his identity, typically a
username.

However, the Kerberos server does not check whether this username
field is valid. If it is empty, the server process try to follow a
NULL pointer.

An attacker can therefore force a NULL pointer to be dereferenced
in the server process Kerberos, in order to trigger a denial of
service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/MIT-krb5-NULL-pointer-dereference-via-GSSAPI-15145


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