Free tools help protect users from IIS zero-day exploit

Tools will provide protection for users until Microsoft decides if it will release a formal patch

Security and patch management vendor Shavlik Technologies Tuesday recommended a pair of free tools from Microsoft to help users protect themselves from a zero-day exploit in Internet Information Server.

Eric Schultze, CTO of Shavlik, says the IIS Lockdown Tool and the URLScan Tool, both available for free from Microsoft, will provide protection for users until Microsoft decides if it will release a formal patch.

Microsoft has not promised a patch. The company's next Patch Tuesday release is slated for June 9.

URLScan v3.1 is an ISAPI filter that reads configuration from an Urlscan.ini file and restricts certain types of HTTP requests from being executed by IIS, according to Microsoft's Web site. The tool installs on IIS 5.1 and later.

The IIS Lockdown Tool can be used on IIS 5.0. The 6.0 and 7.0 versions of IIS have similar built-in security configuration tools and users don't need to run the Lockdown tool on Web servers running those IIS versions.

Schultze says the zero-day flaw appears to be more serious in IIS 5.0 on Windows 2000 because the vulnerable WebDAV services are running by default. He points out that IIS 6.0 on Windows Server 2003 doesn't enable WebDAV by default.

Schultze says it's unclear the level of access an attacker can gain via this exploit. Factors in the depth of the exploit include how the Web server has been configured and how the file system security has been applied to the data on the Web server.

"If the attacker is unable to write any files to the Web server, it's far less likely that the attacker can upload or execute any malicious code on the server or gain additional levels of access to the server," he says.

But he did note that the flaw could enable attackers to read code pages on the Web server, and code pages might include usernames or passwords for applications or databases controlled by the Web server.

Schultze recommends people running IIS 5.0 or 6.0 use the IIS Lockdown and URLScan tools. Both tools disable WebDAV and will protect systems from this latest vulnerability, he says.

Schultze points out that the zero-day flaw is only the third vulnerability in IIS since October of 2004. The other two were seen in July 2006 and February 2008.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags Microsoftmicrosoft patches

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

John Fontana

Network World
Show Comments

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Luke Hill

MSI GT75 TITAN

I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Emily Tyson

MSI GE63 Raider

If you’re looking to invest in your next work horse laptop for work or home use, you can’t go wrong with the MSI GE63.

Laura Johnston

MSI GS65 Stealth Thin

If you can afford the price tag, it is well worth the money. It out performs any other laptop I have tried for gaming, and the transportable design and incredible display also make it ideal for work.

Andrew Teoh

Brother MFC-L9570CDW Multifunction Printer

Touch screen visibility and operation was great and easy to navigate. Each menu and sub-menu was in an understandable order and category

Louise Coady

Brother MFC-L9570CDW Multifunction Printer

The printer was convenient, produced clear and vibrant images and was very easy to use

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

Featured Content

Product Launch Showcase

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?