Check Point Advisories

Microsoft Windows srvsvc Memory Allocation Denial of Service (CVE-2005-3644)

Vulnerability
Protection

Check Point Reference:	CPAI-2005-334
Date Published:	15 Aug 2010
Severity:	Critical
Last Updated:	Sunday 15 August, 2010
Source:
Industry Reference:	CVE-2005-3644
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	There exists a denial of service vulnerability in the Microsoft Windows Server service (srvsvc). A remote attacker can trigger this flaw by sending crafted RPC requests to the problematic service. This may potentially result in the affected service allocating extensive amounts of memory and processor resources, leading to a denial of service condition. Upon receiving the malicious RPC requests, the vulnerable target system will consume all available virtual memory. The CPU resources and memory usage will reach full utilization for a limited amount of time. The target system will experience severe performance degradation for this period of time.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability.

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

In the IPS tab, click Protections and find the Microsoft Windows srvsvc Memory Allocation Denial of Service 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: Windows SMB Protection Violation.
Attack Information: Microsoft Windows srvsvc memory allocation denial of service