From: charlesfol at hotmail dot fr
Operating system: nux/win
PHP version: 5.2.5
PHP Bug Type: *Regular Expressions
Bug description: Regex bypass using POISON NULL BYTE
Description:
------------
I discovered that in this PHP version, regex could be bypassed using \0
(%00) a.k.a. POISON NULL BYTE.
Reproduce code:
---------------
<?php
$var=$_GET['var'];
$is_alphanum_var = ereg("^[a-zA-Z0-9]+$",$var);
print "$is_alphanum_var\n$var";
?>
Expected result:
----------------
Normally if code contains ad chars such as %,", or _ it will be detected
by the regex.
Actual result:
--------------
But if we use this URL:
http://site.com/page.php?var=test%00_-
$is_alphanum_var RETURNS 1, BUT $var CONTAINS _-
Security HOLE.
Warmly, Charles "real" FOL.
--
Edit bug report at http://bugs.php.net/?id=44366&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=44366&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=44366&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=44366&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=44366&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=44366&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=44366&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=44366&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=44366&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=44366&r=support
Expected behavior: http://bugs.php.net/fix.php?id=44366&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=44366&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=44366&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=44366&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=44366&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=44366&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=44366&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=44366&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=44366&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=44366&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=44366&r=mysqlcfg
