Check Point Advisories

Lighttpd mod_fastcgi Extension CGI Variable Overwriting (CVE-2007-4727)

Vulnerability
Protection

Check Point Reference:	CPAI-2007-319
Date Published:	31 Jan 2010
Severity:	High
Last Updated:	Sunday 31 January, 2010
Source:
Industry Reference:	CVE-2007-4727
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Lighttpd is an open source HTTP server project. Lighttpd focus on smaller memory footprint and higher runtime efficiency. The server supports an advanced feature set, including FastCGI. A variable overwriting vulnerability exists in Lighttpd FastCGI extension. A remote unauthenticated attacker can exploit this vulnerability by sending an HTTP request containing crafted header data to the target server, potentially causing information disclosure or execution of malicious scripts in the security context of web server. An attack case where code execution is not successful, will result in information disclosure. In such a case the target host might not exhibit any behavioral difference. If code execution is successful, the behavior of the target will depend on the intention of the attacker. Any injected code will be executed within the security context of the FastCGI application.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

In the IPS tab, click Protections and find the Lighttpd mod_fastcgi Extension CGI Variable Overwriting protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Web Server Enforcement Violation.
Attack Information: Lighttpd mod_fastcgi extension CGI variable overwriting