Check Point Advisories

Blaster Attacks (CVE-2003-0352; CVE-2003-0353)

Vulnerability
Protection

Check Point Reference:	CPAI-2003-0024
Date Published:	7 Sep 2007
Severity:	Critical
Last Updated:	Friday 07 September, 2007
Source:
Industry Reference:	CVE-2003-0352 CVE-2003-0353
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70
Who is Vulnerable?
Vulnerability Description	Buffer overflow in a certain DCOM interface for RPC in Microsoft Windows NT 4.0, 2000, XP, and Server 2003 allows remote attackers to execute arbitrary code via a malformed message, as exploited by the Blaster, MSblast, LovSAN, Nachi, and Welchia worms.

Protection Overview

This protection blocks DCE-RPC requests for Opnums 4 or 0 that contain: 0x5c005c00 and do not contain 0x5c or 0x00000000, such that the distance between the first and last is bigger than 32 bytes. It also blocks DCE-RPC requests for Opnums 4 or 0 that contain: 0x5c005c00 and 0x43002400 at a distance of at least 58, and contain 0x0000 at a distance bigger than 35 bytes.

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

In the IPS tab, click Protections and find the Blaster Attacks 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: DCOM DCE-RPC Enforcement Violation.
Attack Information: phpFileManager cmd Parameter Command Execution