Check Point Advisories

MS-RPC over CIFS Fragmentation (CVE-2010-0102)

Vulnerability
Protection

Check Point Reference:	SBP-2010-35
Date Published:	15 Dec 2010
Severity:	N/A
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 DCE-RPC and CIFS protocols. Though IDS and IPS devices have signatures to detect attacks exploiting these vulnerabilities, these devices can be evaded by using fragmented traffic. Attackers may attempt to send fragmented DCE-RPC over CIFS requests as an IDS/IPS evasion technique. There are cases in which certain traffic, although not intended for malicious use, is very unsafe, since it may transfer shellcode which is undetectable by IPS.

Protection Overview

This protection will detect and block fragmented requests in DCE-RPC over CIFS.

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 MS-RPC over CIFS Fragmentation 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 over CIFS Enforcement Violation.
Attack Information: MS-RPC over CIFS fragmented request detected