ftls.org Guestbook 1.1 Script Injection Vulnerabilities Discovered By BrainRawt (brainrawt (at) hotmail (dot) com [email concealed]) About MyGuestbook: ------------------ Your basic guestbook that can be downloaded at http://www.ftls.org/en/examples/cgi/Guestbook.shtml#s1. Vulnerable (tested) Versions: -------------------- guestbook v 1.1 Vendor Contact: ---------------- 9-27-02 - Emailed webmaster (at) ftls (dot) org [email concealed] 12-15-02 - Emailed tyndiuk (at) ftls (dot) org [email concealed] Vulnerability: ---------------- guestbook.cgi inproperly filters user input making the guestbook vulnerable to script injection. Exploit (POC): ---------------- When filling in ones name use: <script>alert('your_name_field_vuln_to_injection')</script> When filling in the Title use: <script>alert('title_field_vuln_to_injection')</script> When filling in the Comment use: <script>alert('comments_field_vuln')</script> --------------------------------------------------------------------- Which looks better? Blackhat or White? You Decide! - BrainRawt _________________________________________________________________ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963