ID: 44366
Updated by: [EMAIL PROTECTED]
Reported By: charlesfol at hotmail dot fr
-Status: Open
+Status: Bogus
Bug Type: *Regular Expressions
Operating System: nux/win
PHP Version: 5.2.5
New Comment:
As the reporter said ;-)
Previous Comments:
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[2008-03-08 11:02:32] charlesfol at hotmail dot fr
OK, in fact I found that this was a known problem.
I apologize about your wasted time =)
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[2008-03-08 03:12:53] charlesfol at hotmail dot fr
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.
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Edit this bug report at http://bugs.php.net/?id=44366&edit=1
