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TUCoPS :: Web :: PHP :: tb12430.htm

PHP <= 5.2.4 multiple Iconv functions denial of service



PHP <= 5.2.4 multiple Iconv functions denial of service
PHP <= 5.2.4 multiple Iconv functions denial of service



Application: PHP <=5.2.4
Web Site: http://php.net 
Platform: unix
Bug: denial of service
function: iconv(),iconv_strlen(),iconv_mime_decode(),iconv_mime_decode_headers()
special condition: default php-memory-limit 
-------------------------------------------------------
 
1) Introduction
2) Bug
3) Proof of concept
4) Greets
5) Credits
==========1) Introduction
==========
"PHP  is a widely-used general-purpose scripting language that
is especially suited for Web development and can be embedded into HTML."

=====2) Bug
=====
multiple Iconv funtions are vulnerable to a denial of service.

====3)Proof of concept
====/*
debian:~# php -v
PHP 5.2.4 (cli) (built: Aug 31 2007 16:39:15)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies 
*/


Proof of concept example :

1) iconv()



(gdb)run 1.php

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1217608000 (LWP 29444)]
0xb76ed3e5 in iconv_close () from /lib/tls/libc.so.6

2) iconv_mime_decode_headers()



(gdb) run 2.php

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1216760128 (LWP 29475)]
0xb78a69ef in _dl_open () from /lib/tls/libc.so.6

3)iconv_mime_decode()

(gdb) run 3.php



Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1217227072 (LWP 29518)]
0xb78349ef in _dl_open () from /lib/tls/libc.so.6

4)iconv_strlen()



(gdb) run 4.php

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1216637248 (LWP 29543)]
0xb77d9d1b in iconv_open () from /lib/tls/libc.so.6


 
=======4)Greets
=======Ivanlef0u,Deimos,Benji,Berga,Soh,and everyones from worldnet: #futurezone & #nibbles

====5)Credits
====
Laurent gaffie
contact : laurent.gaffie@gmail.com 
stay tuned, site comming soon ....


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