MyBB 1.6 <= Cross Site Scripting Vulnerability
MyBB was vulnerable to Cross Site Scripting Vulnerability.
2. APPLICATION DESCRIPTION
MyBB is a free bulletin board system software package developed by the MyBB Group.
It's supposed to be developed from XMB and DevBB bulletin board applications.
3. VULNERABILITY DESCRIPTION
Two XSS vulnerabilities were found. One is user-driven XSS on "url" parameter.
User will get xssed upon successful log-in.
The other is a reflected XSS on "posthash" parameter where the valid tid (topic id) is required for successful attack.
The anti-CSRF check against "my_post_key" parameter was not done in thread/post preview mode and thus there came a way for XSS to be successful.
4. VERSIONS AFFECTED
MyBB 1.6 and lower
Upgrade to 1.6.1
MyBB Development Team
This vulnerability was discovered by Aung Khant, http://yehg.net, YGN Ethical Hacker Group, Myanmar.
9. DISCLOSURE TIME-LINE
2010-12-09: notified vendor
2010-12-15: vendor released fixed version
2010-12-20: vulnerability disclosed
Original Advisory URL: http://yehg.net/lab/pr0js/advisories/[mybb1.6]_cross_site_scripting
Vendor ChangeLog: http://blog.mybb.com/2010/12/15/mybb-1-6-1-release-1-4-14-update/
About MyBB: http://www.mybb.com/about/mybb
#last updated at 2010-12-23