krb5: null pointer dereference in GSS-API library leads to DoS (MITKRB5-SA-2010-005)

The kgacceptkrb5 function in krb5/acceptseccontext.c in the GSS-API library in MIT Kerberos 5 aka krb5 through 1.7.1 and 1.8 before 1.8.2, as used in kadmind and other applications, does not properly check for invalid GSS-API tokens, which allows remote authenticated users to cause a denial of...