Fix bug #68942 (Use after free vulnerability in unserialize() with DateTimeZone)

Author: smalyshev

NEWS

@@ -39,6 +39,8 @@ PHP                                                                        NEWS
     (Danack at basereality dot com)
   . Fixed bug #68925 (Mitigation for CVE-2015-0235 – GHOST: glibc gethostbyname
     buffer overflow). (Stas)
+  . Fixed bug #68942 (Use after free vulnerability in unserialize() with
+    DateTimeZone). (Stas)
 
 - Date:
   . Fixed bug #45081 (strtotime incorrectly interprets SGT time zone). (Derick)

ext/date/php_date.c

@@ -2779,12 +2779,9 @@ static int php_date_initialize_from_hash(php_date_obj **dateobj, HashTable *myht
 	timelib_tzinfo   *tzi;
 	php_timezone_obj *tzobj;
 
-	if (zend_hash_find(myht, "date", 5, (void**) &z_date) == SUCCESS) {
-		convert_to_string(*z_date);
-		if (zend_hash_find(myht, "timezone_type", 14, (void**) &z_timezone_type) == SUCCESS) {
-			convert_to_long(*z_timezone_type);
-			if (zend_hash_find(myht, "timezone", 9, (void**) &z_timezone) == SUCCESS) {
-				convert_to_string(*z_timezone);
+	if (zend_hash_find(myht, "date", 5, (void**) &z_date) == SUCCESS && Z_TYPE_PP(z_date) == IS_STRING) {
+		if (zend_hash_find(myht, "timezone_type", 14, (void**) &z_timezone_type) == SUCCESS && Z_TYPE_PP(z_timezone_type) == IS_LONG) {
+			if (zend_hash_find(myht, "timezone", 9, (void**) &z_timezone) == SUCCESS && Z_TYPE_PP(z_timezone) == IS_STRING) {
 
 				switch (Z_LVAL_PP(z_timezone_type)) {
 					case TIMELIB_ZONETYPE_OFFSET:
@@ -2799,7 +2796,6 @@ static int php_date_initialize_from_hash(php_date_obj **dateobj, HashTable *myht
 
 					case TIMELIB_ZONETYPE_ID: {
 						int ret;
-						convert_to_string(*z_timezone);
 
 						tzi = php_date_parse_tzfile(Z_STRVAL_PP(z_timezone), DATE_TIMEZONEDB TSRMLS_CC);
 
@@ -3716,9 +3712,8 @@ static int php_date_timezone_initialize_from_hash(zval **return_value, php_timez
 	zval            **z_timezone = NULL;
 	zval            **z_timezone_type = NULL;
 
-	if (zend_hash_find(myht, "timezone_type", 14, (void**) &z_timezone_type) == SUCCESS) {
+	if (zend_hash_find(myht, "timezone_type", 14, (void**) &z_timezone_type) == SUCCESS && Z_TYPE_PP(z_timezone_type) == IS_LONG) {
 		if (zend_hash_find(myht, "timezone", 9, (void**) &z_timezone) == SUCCESS) {
-			convert_to_long(*z_timezone_type);
 			if (SUCCESS == timezone_initialize(*tzobj, Z_STRVAL_PP(z_timezone) TSRMLS_CC)) {
 				return SUCCESS;
 			}
@@ -3743,7 +3738,9 @@ PHP_METHOD(DateTimeZone, __set_state)
 
 	php_date_instantiate(date_ce_timezone, return_value TSRMLS_CC);
 	tzobj = (php_timezone_obj *) zend_object_store_get_object(return_value TSRMLS_CC);
-	php_date_timezone_initialize_from_hash(&return_value, &tzobj, myht TSRMLS_CC);
+	if(php_date_timezone_initialize_from_hash(&return_value, &tzobj, myht TSRMLS_CC) != SUCCESS) {
+		php_error_docref(NULL, E_ERROR, "Timezone initialization failed");
+	}
 }
 /* }}} */
 
@@ -3759,7 +3756,9 @@ PHP_METHOD(DateTimeZone, __wakeup)
 
 	myht = Z_OBJPROP_P(object);
 
-	php_date_timezone_initialize_from_hash(&return_value, &tzobj, myht TSRMLS_CC);
+	if(php_date_timezone_initialize_from_hash(&return_value, &tzobj, myht TSRMLS_CC) != SUCCESS) {
+		php_error_docref(NULL, E_ERROR, "Timezone initialization failed");
+	}
 }
 /* }}} */
 

ext/date/tests/bug68942.phpt

@@ -0,0 +1,9 @@
+--TEST--
+Bug #68942 (Use after free vulnerability in unserialize() with DateTimeZone).
+--FILE--
+<?php
+$data = unserialize('a:2:{i:0;O:12:"DateTimeZone":2:{s:13:"timezone_type";a:2:{i:0;i:1;i:1;i:2;}s:8:"timezone";s:1:"A";}i:1;R:4;}');
+var_dump($data);
+?>
+--EXPECTF--
+Fatal error: DateTimeZone::__wakeup(): Timezone initialization failed in %s/bug68942.php on line %d

ext/date/tests/bug68942_2.phpt

@@ -0,0 +1,9 @@
+--TEST--
+Bug #68942 (Use after free vulnerability in unserialize() with DateTime).
+--FILE--
+<?php
+$data = unserialize('a:2:{i:0;O:8:"DateTime":3:{s:4:"date";s:26:"2000-01-01 00:00:00.000000";s:13:"timezone_type";a:2:{i:0;i:1;i:1;i:2;}s:8:"timezone";s:1:"A";}i:1;R:5;}');
+var_dump($data);
+?>
+--EXPECTF--
+Fatal error: Invalid serialization data for DateTime object in %s/bug68942_2.php on line %d