Check Point Advisories

Xerver HTTP CRLF Injection Response Splitting (CVE-2009-4086)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-318
Date Published:	28 Jun 2011
Severity:	High
Last Updated:	Tuesday 16 September, 2014
Source:
Industry Reference:	CVE-2009-4086
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	This is a CRLF injection vulnerability in Xerver HTTP Server. Remote attackers could use this vulnerability to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via certain byte sequences at the end of a URL

Protection Overview

This protection will detect and block CLRF encoded characters in HTTP request

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 Xerver HTTP CRLF Injection Response Splitting 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: Xerver HTTP CRLF injection response splitting