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Description:

Advanced Guestbook is a PHP-based guestbook script. It includes many useful features such as preview, templates, e-mail notification, picture upload, page spanning , html tags handling, smiles, advanced guestbook codes and language support. The admin script lets you modify, view, and delete messages. Requires PHP4 and MySQL.

This vulnerabilities can be exploited only when PHP register_globals is On.

External References:
Mitre CVE: CVE-2007-0605
NVD NIST: CVE-2007-0605
OSVDB: 33877
BUGTRAQ/BID: 23873


Summary:
Advanced Guestbook is a PHP-based guestbook with admin interface.
Security problems in the product allows attackers to conduct XSS attacks
Security problem in the product allows attackers to conduct XSS attacks.

Release Date:
May 07 2007

Severity:
Risk: Medium

CVSS Metrics:
Access Vector: Remote
Access Complexity: High
Authentication: not-required
Confidentiality Impact: Partial
Integrity Impact: Partial
Availability Impact: Partial
Impact Bias: Normal
CVSS Base Score: 5.6

Target Distribution on Internet: Low

Exploitability: Functional Exploit
Remediation Level: Workaround
Report Confidence: Uncorroborated

Vulnerability Impact: Attack
Host Impact: XSS Attack

SecureScout Testcase ID:
TC 17948

Vulnerable Systems:
Advanced Guestbook version 2.4.2

Vulnerability Type:
XSS (Cross-Site Scripting) to force a web-site to display malicious contents to the target, by sending a specially crafted request to the web-site. The vulnerable web-site is not the target of attack but is used as a tool for the hacker in the attack of the victim.

Vendor:
Chi Kien Uong

Vendor Status:
Contact with the Vendor was established but draft of the security advisory wasn't provided because the Vendor stopped responding to our emails on 9 March 2007. There is no official fix at the release of this Security Advisory

Workaround:
Set PHP register_globals to Off.

Example:

REQUEST:
http://[TARGET]/[guestbook-directory]/picture.php?size[0]=1&size[1]=1&img=1&picture=%22%3E%3Cscript%3Ealert(%22ok%22)%3C/script%3E%3Cimg%20src=%22

REPLY:
Will execute <script>alert(document.cookie)</script>



Credits:
Jesper Jurcenoks
Co-founder netVigilance, Inc
www.netvigilance.com