|Check Point Reference:||CPAI-0000-000|
|Date Published:||7 Sep 2007|
|Last Updated:||29 Apr 2015|
|Protection Provided by:||
|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.|
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
Protection tab and select the version of your choice.
SmartView Tracker will log the following entries:
Attack Name: DCE-RPC Enforcement Violation.
Attack Information: Blaster attack blocked