Eggblog v3.1.0 XSS Vulnerability

H - Security Labs
Eggblog v3.1.0 Security Advisory
ID : HSEC#20071111
General Information

Name : EggBlog v.3.1.0
Vendor HomePage :http://sourceforge.net/projects/eggblog/
Platforms : PHP && MySQL
Vulnerability Type : Input Validation Error

Timeline

08 October 2007 – Vendor Contacted
30 October 2007 – Vendor Replied
11 November 2007 – New Release
11 November 2007 – Advisory Released

What is Eggblog

eggblog is a free PHP & MySQL blogging package. Features include an internal search engine,

photo albums, forums, plug-ins, guest comments to blog articles, automatic monthly archiving

of blog articles and RSS XML feeds for both the blog and forums.
I discovered the security holes when I was testing it for my personel web blog.

Vulnerability Overview

The script is vulnerable to XSS attacks.

Details About Vulnerability

XSS Vulnerability(home/rss.php)

At the rss.php line 6-7; there are unfiltered PHP_SELFs that can be used for XSS attacks.

<a

href=\"…/rss/blog.php\">".$_SERVER['SERVER_NAME'].str_replace("/home/rss.php","",$_SERVER['

PHP_SELF'])."/rss/blog.php</a></li>
<a

href=\"…/rss/topics.php\">".$_SERVER['SERVER_NAME'].str_replace("/home/rss.php","",$_SERVER

['PHP_SELF'])."/rss/topics.php</a></li>

The attacker can succesfully launch XSS attacks with loading payload on to the URL after the

home\rss.php. For example :
http://www.example.com/home/rss.php/&lt;script&gt;alert&#40;1&#41;&lt;/script&gt;

Solutions

Download the new release : EggBlog v3.1.1

Credits

The vulnerabilities found on 08 October 2007
by Mesut Timur <[email protected]>
H - Security Labs , http://www.h-labs.org
Gebze Institue of Technology,Computer Engineering,http://www.gyte.edu.tr

References

http://sourceforge.net/forum/forum.php?forum_id=753622
http://www.eggblog.net
http://sourceforge.net/projects/eggblog/
Original Advisory : http://www.h-labs.org/blog/2007/11/11/eggblog_v3_1_0_xss_issues.html

Mesut TIMUR
http://www.h-labs.org
H - Security Labs Gьvenlik Editцrь
GYTE Bilgisayar Mьhendisligi