Microsoft IIS servers vulnerable to FTP attack

Microsoft issues security warning but doesn't yet provide a patch to fix the vulnerability

A critical flaw in the FTP component of Microsoft Internet Information Service (IIS) can allow an attacker to execute malicious commands on a server, Microsoft warned in a new security advisory.

According to a Microsoft Security Research & Defense post, if a vulnerable IIS 5.0 (Windows 2000), 5.1 (XP) or 6.0 (Server 2003) FTP service attempts to list a "long, specially-crafted directory name," a stack overflow will occur that can allow for remote code execution. IIS 7.0 (Vista, Server 2008) is not vulnerable, according to the post.

To be hit, "an FTP server would need to grant untrusted users access to log into and create that long, specially-drafted directory."

There is not yet any patch available, and Microsoft says it has seen "detailed exploit code" available online, though it hasn't yet seen any active attacks. Microsoft's post lists workarounds for the time being, including how to prevent anonymous FTP users from being able to create directories.

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 Microsoftserversiis server

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

Erik Larkin

PC World (US online)
Show Comments

Brand Post

Bitdefender 2019

Taking cybersecurity to the highest level and order now for a special discount on the world’s most awarded and trusted cybersecurity. Be aware without a care!

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

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?