Check Point Advisories

Microsoft Exchange Server iCal Properties Denial of Service (MS07-026; CVE-2007-0039)

Vulnerability
Protection

Check Point Reference:	CPAI-2007-081
Date Published:	17 May 2007
Severity:	High
Last Updated:	Thursday 17 May, 2007
Source:
Industry Reference:	CVE-2007-0039
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description	Simple Mail Transfer Protocol (SMTP) is a core Internet protocol used for transferring e-mail across the Internet. The Microsoft Exchange Server is a collaborative software server from Microsoft capable of handling numerous Internet protocols, including the Simple Mail Transfer Protocol (SMTP). It is widespread in large corporations using Microsoft infrastructure solutions. iCal is the Internet Calendaring and Scheduling Core Object, used for the purpose of exchanging calendaring and scheduling information. By sending crafted iCal messages, an attacker can cause the Microsoft Exchange server to terminate, resulting in a denial of service.

Protection Overview

This protection will detect and block iCal messages exhibiting this vulnerability.The detect mode makes it possible to track unauthorized traffic without blocking it.

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 Microsoft Exchange Server iCal Properties Denial of Service (MS07-026) 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: SMTP Protection Violation.
Attack Information: Microsoft Exchange Server iCal properties denial of service (MS07-026)