Eggblog v3.1.0 XSS Vulnerability

Credit: mesut
Risk: Low
Local: No
Remote: Yes

CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

H - Security Labs Eggblog v3.1.0 Security Advisory ID : HSEC#20071111 General Information -------------------------- Name : EggBlog v.3.1.0 Vendor HomePage : 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 :<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 , Gebze Institue of Technology,Computer Engineering, References ----------------------- Original Advisory : Mesut TIMUR H - Security Labs Gvenlik Editr GYTE Bilgisayar Mhendisligi

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