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Bug #28456 upload php vulnerability
Submitted: 2004-05-20 17:03 UTC Modified: 2004-09-22 07:20 UTC
From: overflow at neuf dot fr Assigned:
Status: Closed Package: Unknown/Other Function
PHP Version: 4.3.4 OS:
Private report: No CVE-ID: None
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From: overflow at neuf dot fr
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 [2004-05-20 17:03 UTC] overflow at neuf dot fr 
Description:
------------
upload php vulnerability for $_FILES['userfile']['name'] can contain string "../" if the name start with a "." with a fake raw http :
Content-Disposition: form-data; name="userfile"; filename="../../../test.html"



Reproduce code:
---------------
http://slythers.tcpteam.org/uploadphpvuln.txt

Expected result:
----------------
security vulnerability in upload script

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 [2004-05-20 17:49 UTC] mail at young dot org dot ua 
Oh, yes.
I have try to analyze this question, and got following result:

If Post data looks like this:
Content-Disposition: form-data; name="userfile"; filename="../test.html"

Variable $_FILES['userfile']['name'] initializes with value "../test.html"

And one more example code taken from PHP manual:
--------
$uploaddir = '/var/www/uploads/';
$uploadfile = $uploaddir . $_FILES['userfile']['name'];

if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile)) {
--------

Trying to copy file into '/var/www/uploads/../test.html

And in opinien this situation potential dangerous.
 [2004-05-20 18:30 UTC] overflow at neuf dot fr 
$_FILES['userfile']['type'] can be fake by the client with raw http : Content-Type: text/plain
 [2004-05-21 10:25 UTC] tony2001@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.
 [2004-09-21 09:06 UTC] NetVicious at gmail dot com 
Hi! toni2001 do could post the changes to the source code for manual patching ?
 [2004-09-22 07:20 UTC] tony2001@php.net 
http://cvs.php.net/diff.php/php-src/main/rfc1867.c?r1=1.122.2.18&r2=1.122.2.19&ty=u
http://cvs.php.net/diff.php/php-src/main/rfc1867.c?r1=1.155&r2=1.156&ty=u
 
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