Sunday, March 13, 2011

bbPress 1.0.2 <= Cross Site Scripting Vulnerability



1. OVERVIEW

bbPress 1.0.2 and lower versions were vulnerable to Cross Site Scripting.


2. APPLICATION DESCRIPTION

bbPress is plain and simple forum software, plain and simple with a twist from the creators of WordPress.
It is focused on web standards, ease of use, ease of integration, and speed.


3. VULNERABILITY DESCRIPTION

The "re" parameter was not properly sanitized upon submission to the /bb-login.php url, which allows attacker to conduct Cross Site Scripting attack.
This may allow an attacker to create a specially crafted URL that would execute arbitrary script code in a victim's browser.
If a user has already logged in to the application, an XSS attack will execute promptly.
If not, it will execute after the user's successful logging in.


4. VERSIONS AFFECTED

bbPress 1.0.2 and lower


5. PROOF-OF-CONCEPT/EXPLOIT

http://localhost/bb-login.php?re=data%3Atext%2Fhtml%3Bbase64%2CPHNjcmlwdD5hbGVydCgiWFNTXG4iK2RvY3VtZW50LmNvb2tpZSk8L3NjcmlwdD4%3D


6. SOLUTION

Upgrade to 1.0.3 or higher


7. VENDOR

bbPress Development Team
http://bbpress.org/


8. CREDIT

This vulnerability was discovered by Aung Khant, http://yehg.net, YGN Ethical Hacker Group, Myanmar.


9. DISCLOSURE TIME-LINE

2010-12-23: notified vendor
2011-02-24: vendor released fixed version
2011-03-13: vulnerability disclosed


10. REFERENCES

Original Advisory URL: http://yehg.net/lab/pr0js/advisories/[bbpress-1.0.2]_cross_site_scripting
About bbPress: http://bbpress.org/about/


#yehg [2011-03-13]