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Security Best Practice: Familiarize Yourself with the ASCII Only Response Headers Protection

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Check Point Reference: SBP-2008-21
Date Published:
Severity:
Last Updated:
Source: IPS Research Center
Protection Provided by: Security Gateway
  • R70
VPN-1
  • NGX R65
VSX
  • NGX R65
Who is Vulnerable?
Web Servers
Vulnerability Description
HTTP Protocol Inspection provides strict enforcement of the HTTP protocol, ensuring these sessions comply with RFC standards and common security practices.

Various attacks use binary and other non-ASCII characters to deliver worms and other malicious content to web servers.
Vulnerability Details
This protection allows you to force all HTTP headers in an HTTP response to be ASCII only. This will prevent some malicious content from passing in the HTTP protocol headers of an HTTP response.

Protection Overview
This protection detects and blocks header responses which contain non ASCII values.

To configure the defense, select your product from the list below and follow the related protection steps.

Security Gateway R70

How Can I Protect My Network?
1. In the IPS tab, click Protections > By Protocol > Web Intelligence > HTTP Protocol Inspection.
2. In the right pane, double-click the ASCII Only Response Headers protection.
3. In the Protection Details window, click on Edit. Choose the protection's Action (Override IPS Policy with: Prevent/Detect), and apply Additional Settings.
4. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: ASCII Only Response
Attack Information: Invalid character detected in request form input

VPN-1 NGX R65 & VPN-1 VSX NGX R65

How Can I Protect My Network?
1. In the SmartDefense tab, click Web Intelligence > HTTP Protocol Inspection > ASCII Only Response Headers.
2. In the configuration pane, under Settings > Mode, check Active.
3. Install policy on all modules.

How Do I Know if My Network is Under Attack?
SmartView Tracker will log the following entries:

Attack Name: ASCII Only Response
Attack Information: Invalid character detected in request form input