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From 08c642c09c38a9c6454ab43a9b53b2a89b9eef99 Mon Sep 17 00:00:00 2001
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From: Greg Hudson <ghudson@mit.edu>
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Date: Mon, 14 Mar 2016 17:26:34 -0400
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Subject: [PATCH] Fix LDAP null deref on empty arg [CVE-2016-3119]
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In the LDAP KDB module's process_db_args(), strtok_r() may return NULL
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if there is an empty string in the db_args array. Check for this case
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and avoid dereferencing a null pointer.
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CVE-2016-3119:
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In MIT krb5 1.6 and later, an authenticated attacker with permission
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to modify a principal entry can cause kadmind to dereference a null
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pointer by supplying an empty DB argument to the modify_principal
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command, if kadmind is configured to use the LDAP KDB module.
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CVSSv2 Vector: AV:N/AC:H/Au:S/C:N/I:N/A:C/E:H/RL:OF/RC:ND
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ticket: 8383 (new)
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target_version: 1.14-next
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target_version: 1.13-next
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tags: pullup
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---
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src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c b/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c
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index 6e591e1..79c4cf0 100644
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--- a/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c
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+++ b/src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c
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@@ -296,6 +296,7 @@ process_db_args(krb5_context context, char **db_args, xargs_t *xargs,
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if (db_args) {
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for (i=0; db_args[i]; ++i) {
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arg = strtok_r(db_args[i], "=", &arg_val);
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+ arg = (arg != NULL) ? arg : "";
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if (strcmp(arg, TKTPOLICY_ARG) == 0) {
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dptr = &xargs->tktpolicydn;
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} else {
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--
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2.8.1
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