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Bug #33784 NUL allowed in file paths
Submitted: 2005-07-20 12:20 UTC Modified: 2005-07-20 12:24 UTC
From: pornel at despammed dot com Assigned:
Status: Not a bug Package: *Directory/Filesystem functions
PHP Version: 5CVS-2005-07-20 (dev) OS: All? Win32 tested
Private report: No CVE-ID: None
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From: pornel at despammed dot com
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 [2005-07-20 12:20 UTC] pornel at despammed dot com
Description:
------------
NUL character (C string terminator) is allowed in file paths passed to OS functions, which causes unexpected truncation of string.

This is a security risk for popular, sloppy code like:
 include($_GET['page'].'.i-feel-safe.php');
because ?page=/etc/passwd%00 circumvents such "protection".

IMHO PHP should throw an error if PHP string can't be safely converted to C string.


Reproduce code:
---------------
<?php
fopen(urldecode("test%00.html"),"r");

Expected result:
----------------
Error: illegal path

Actual result:
--------------
Warning: fopen(test) [function.fopen]: failed to open stream: No such file or directory in c:\www\test.php5 on line 2

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 [2005-07-20 12:24 UTC] tony2001@php.net
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

You should do all the required checks yourself.
 
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