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!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection

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

Cool Tech

SanDisk MicroSDXC™ for Nintendo® Switch™

Learn more >

Breitling Superocean Heritage Chronographe 44

Learn more >

Toys for Boys

Family Friendly

Panasonic 4K UHD Blu-Ray Player and Full HD Recorder with Netflix - UBT1GL-K

Learn more >

Stocking Stuffer

Razer DeathAdder Expert Ergonomic Gaming Mouse

Learn more >

Christmas Gift Guide

Click for more ›

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

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.

Walid Mikhael

Brother QL-820NWB Professional Label Printer

It’s easy to set up, it’s compact and quiet when printing and to top if off, the print quality is excellent. This is hands down the best printer I’ve used for printing labels.

Ben Ramsden

Sharp PN-40TC1 Huddle Board

Brainstorming, innovation, problem solving, and negotiation have all become much more productive and valuable if people can easily collaborate in real time with minimal friction.

Sarah Ieroianni

Brother QL-820NWB Professional Label Printer

The print quality also does not disappoint, it’s clear, bold, doesn’t smudge and the text is perfectly sized.

Ratchada Dunn

Sharp PN-40TC1 Huddle Board

The Huddle Board’s built in program; Sharp Touch Viewing software allows us to easily manipulate and edit our documents (jpegs and PDFs) all at the same time on the dashboard.

George Khoury

Sharp PN-40TC1 Huddle Board

The biggest perks for me would be that it comes with easy to use and comprehensive programs that make the collaboration process a whole lot more intuitive and organic

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?