File 0107-Fix-LDAP-null-deref-on-empty-arg-CVE-2016-3119.patch of Package krb5.5972

From 08c642c09c38a9c6454ab43a9b53b2a89b9eef99 Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Mon, 14 Mar 2016 17:26:34 -0400
Subject: [PATCH] Fix LDAP null deref on empty arg [CVE-2016-3119]

In the LDAP KDB module's process_db_args(), strtok_r() may return NULL
if there is an empty string in the db_args array.  Check for this case
and avoid dereferencing a null pointer.

CVE-2016-3119:

In MIT krb5 1.6 and later, an authenticated attacker with permission
to modify a principal entry can cause kadmind to dereference a null
pointer by supplying an empty DB argument to the modify_principal
command, if kadmind is configured to use the LDAP KDB module.

    CVSSv2 Vector: AV:N/AC:H/Au:S/C:N/I:N/A:C/E:H/RL:OF/RC:ND

ticket: 8383 (new)
target_version: 1.14-next
target_version: 1.13-next
tags: pullup

Line numbers are slightly adjusted by Howard Guo <hguo@suse.com> to fit into this older version of Kerberos.

diff -rupN krb5-1.12.5/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c krb5-1.12.5-patched/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c
--- krb5-1.12.5/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c	2015-12-16 21:35:51.000000000 +0100
+++ krb5-1.12.5-patched/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c	2016-03-23 14:36:05.248372155 +0100
@@ -268,6 +268,7 @@ process_db_args(krb5_context context, ch
     if (db_args) {
         for (i=0; db_args[i]; ++i) {
             arg = strtok_r(db_args[i], "=", &arg_val);
+            arg = (arg != NULL) ? arg : "";
             if (strcmp(arg, TKTPOLICY_ARG) == 0) {
                 dptr = &xargs->tktpolicydn;
             } else {