Eggblog v3.1.0 XSS Vulnerability Nov 11 2007 08:13PM
mesut h-labs org
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\">".$_SERVER['SERVER_NAME'].str_replace("/home/rs
s.php","",$_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/<script>alert(1)</script>

Solutions

-----------------------

Download the new release : EggBlog v3.1.1

Credits

-----------------------

The vulnerabilities found on 08 October 2007

by Mesut Timur <mesut (at) h-labs (dot) org [email concealed]>

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 Güvenlik Editörü

GYTE Bilgisayar Mühendisligi

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