Check Point Advisories

DCE-RPC Invalid NDR Value Evasion Technique (CVE-2010-0102)

Vulnerability
Protection

Check Point Reference:	SBP-2010-33
Date Published:	15 Dec 2010
Severity:	Critical
Last Updated:	Wednesday 15 December, 2010
Source:
Industry Reference:	CVE-2010-0102
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description	DCE/RPC stands for Distributed Computing Environment / Remote Procedure Calls. It is a Remote Procedure Call system that allows software to work across multiple computers, as if it were all working on the same computer. This system allows programmers to write distributed software without having to worry about the underlying network code. There are many known vulnerabilities in applications based on the DCE-RPC protocol. Though IDS and IPS devices have signatures to detect attacks exploiting these vulnerabilities, these devices can be evaded by using an invalid value in the NDR field. Attackers may use this as an IDS/IPS evasion technique.

Protection Overview

This protection will detect and block DCE-RPC requests containing an invalid NDR value.

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 / R71 / R70 / R65

In the IPS tab, click Protections and find the DCE-RPC Invalid NDR Value Evasion Technique 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: MS-RPC Enforcement Violation.
Attack Information: DCE-RPC invalid NDR value detected