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Sourcefire Vulnerability Research Team Protects Users from Latest Microsoft Windows and Internet Explorer Vulnerabilities

Wokingham, UK – 17th June, 2008 – Open source innovator and SNORT® creator, Sourcefire, Inc. (Nasdaq: FIRE), a leader in Enterprise Threat Management, announced that the Sourcefire® Vulnerability Research Team (VRT) has delivered rules to protect Sourcefire customers and Snort users from six Microsoft vulnerabilities disclosed today. These vulnerabilities impact Microsoft Windows and Internet Explorer.

“In the first half of 2008, we saw a number of serious vulnerabilities that could create significant security issues for today’s dynamic businesses,” said Matt Watchinski, Director of the Sourcefire Vulnerability Research Team. “Detection and patching are essential to protecting against the latest identified vulnerabilities, but only a proactive approach to securing assets from unknown threats can truly safeguard an organization’s most critical assets. Sourcefire’s innovative solutions, backed by the VRT’s leading-edge discovery and response, provide customers and open source users with the tools to protect their networks, even when the threat has not yet been identified.”

Following Microsoft’s disclosure earlier today, the Sourcefire VRT created, tested and delivered Snort rules designed to detect attacks targeting the Microsoft vulnerabilities listed below. These new rules are included in the latest Sourcefire Security Enhancement Update (SEU) released today.

- Microsoft Security Bulletin MS08-031 -- Critical vulnerabilities could allow remote code execution or information disclosure if a user viewed a specially crafted Web page using Internet Explorer.

- Microsoft Security Bulletin MS08-032 – A moderate vulnerability in the Microsoft Speech API could allow remote code execution if a user viewed a specially crafted Web page using Internet Explorer and has the Speech Recognition feature in Windows enabled.

- Microsoft Security Bulletin MS08-033 -- Critical vulnerabilities in Microsoft DirectX could allow remote code execution if a user opens a specially crafted media file. An attacker who successfully exploited these vulnerabilities could take complete control of an affected system.

- Microsoft Security Bulletin MS08-034 -- An important vulnerability in the Windows Internet Name Service (WINS) could allow elevation of privilege. A local attacker who successfully exploited this vulnerability could take complete control of an affected system.

- Microsoft Security Bulletin MS08-035 -- An important vulnerability in implementations of Active Directory could be exploited to allow an attacker to cause a denial of service condition. An attacker who successfully exploited this vulnerability could cause the system to stop responding or automatically restart.

- Microsoft Security Bulletin MS08-036 -- Important vulnerabilities in the Pragmatic General Multicast (PGM) protocol could allow a denial of service if malformed PGM packets are received by an affected system. An attacker who successfully exploited this vulnerability could cause a user’s system to become non-responsive and require a restart to restore functionality.

About the Sourcefire VRT

The Sourcefire VRT is a group of leading edge intrusion detection and prevention experts working to proactively discover, assess and respond to the latest trends in hacking activities, intrusion attempts and vulnerabilities. This team is also supported by the vast resources of the open source Snort community, making it the largest group dedicated to advances in the network security industry.
About Sourcefire Sourcefire, Inc. (Nasdaq: FIRE), Snort creator and open source innovator, is a world leader in Enterprise Threat Management (ETM) solutions. Sourcefire is transforming the way Global 2000 organizations and government agencies manage and minimize network security risks with its 3D Approach – Discover, Determine, Defend – to securing real networks. This ETM approach equips customers with an efficient and effective layered security defense – protecting network assets before, during and after an attack. Through the years, Sourcefire has been consistently recognized for its innovation and industry leadership by customers, media and industry analysts alike – with more than 40 awards and accolades. Today, the names Sourcefire and founder Martin Roesch have grown synonymous with innovation and network security intelligence. For more information about Sourcefire, please visit http://www.sourcefire.com.

SOURCEFIRE®, SNORT®, the Sourcefire logo, the Snort and Pig logo, SECURITY FOR THE REAL WORLD™, SOURCEFIRE DEFENSE CENTER™, SOURCEFIRE 3D™, RNA™, DAEMONLOGGER™, CLAMAV™, SOURCEFIRE SOLUTIONS NETWORK™, and certain other trademarks and logos are trademarks or registered trademarks of Sourcefire, Inc. in the United States and other countries. Other company, product and service names may be trademarks or service marks of others.

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Media Contact:

Paula Elliott
Managing Director
C8 Consulting Ltd
+44 (0) 118 9001132 /+44 (0) 7894 339645
paula@c8consulting.co.uk

Investor Contact:

Tania Almond
Investor Relations Officer
Sourcefire, Inc
+ 1 410 423 1919
Tania.almond@sourfire.com

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