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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
---
src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c b/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c
index 6e591e1..79c4cf0 100644
--- a/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c
+++ b/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c
@@ -296,6 +296,7 @@ process_db_args(krb5_context context, char **db_args, xargs_t *xargs,
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 {
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