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Arrow  Topic :

Advanced Guestbook version 2.4.2 Multiple XSS Attack Vulnerabilities


Arrow  SecurityAlert : 2663
Arrow  CVE : CVE-2007-0605
Arrow  SecurityRisk : Low  Security Risk Low  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : No
Arrow  Exploit Available : Yes
Arrow  Credit : netvigilance
Arrow  Published : 12.05.2007

Arrow  Affected Software : Advanced Guestbook version 2.4.2



Arrow  Advisory Content :  

netVigilance Security Advisory #12
Advanced Guestbook version 2.4.2 Multiple XSS Attack Vulnerabilities
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.
External References:
Mitre CVE: CVE-2007-0605
NVD NIST: CVE-2007-0605
OSVDB: 33877
Summary:
Advanced Guestbook is a PHP-based guestbook with admin interface.
Security problems in the product allows attackers to conduct XSS attacks
This vulnerabilities can be exploited only when PHP register_globals is
On.
Advisory URL:
http://www.netvigilance.com/advisory0012
Release Date:
05/07/2007
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:
Vulnerable Systems:
Advanced Guestbook 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 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:
XSS Attack Vulnerability 1:
REQUEST:
http://[TARGET]/[guestbook-directory]/picture.php?size[0]=1&size[1]=1&im
g=1&picture=%22%3E%3Cscript%3Ealert(%22ok%22)%3C/script%3E%3Cimg%20src=%
22

REPLY:
Will execute <script>alert(document.cookie)</script>
XSS Attack Vulnerability 2:
The remote attacker can avoid the .htaccess file protection and run any
script or view the contents of the templates.
Set in the COOKIES variable lang = "../[name of the script without php
extension]" for example "../lib/admin.class"
REQUEST:
http://[TARGET]/[guestbook-directory]/index.php

REPLY:
The Server will execute the script

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





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