yabook-xss.txt

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"YA Book 0.98-alpha - Persistent XSS Vulnerability"  
by Omni  
  
1) Infos  
---------  
Date : 2007-04-23  
Product : YA Book  
Version : 0.98-alpha - Prior version maybe also be affected  
Vendor : http://sourceforge.net/projects/yabook - http://www.phpee.com/  
Vendor Status : 2007-04-23 -> Not Informed!  
2007-04-24 -> Informed!  
  
Description : YaBook- Ya Book! ...or yet another guestbook. YaBook is a simple but powerful guestbook running on PHP  
5. It features easy installation and customization, multi-language support, and an administration  
interface. Various database systems are supported.  
  
Google Dork : Powered by YaBook 0.98-alpha - "Powered by YaBook 0.98-alpha"  
  
  
Source : omnipresent - omni  
E-mail : omnipresent[at]email[dot]it - omni[at]playhack[dot]net  
Team : Playhack.net Security  
  
2) Security Issues  
-------------------  
  
--- [ Remote Persistent XSS ] ---  
=================================  
  
YA Book is vulnerable to an XSS. A malicous user can put in the City Field HTML or JS code  
(in sigin module: http://host/path/index.php?mode=sign) as shown below:  
  
Eg script:  
  
<script>alert("XSS")</script>  
  
The vulnerability exist because the city field is not properly sanitized before being used!  
  
--- [ PoC ] ---  
===============  
  
A guest can posts a new message and after put the right captcha :D he can puts in the city field a code like:  
  
<script>location.href="http://host.com"</script>  
  
for a redirect with JS or.. he can injects other (eg: HTML, JS) codes..  
  
  
3) Patch  
--------  
  
Edit the source code to ensure that the input is properly sanitized before being used.  
  
  
  
  
  
  
  
  
  
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