Apache warns Web server admins of DoS attack tool

'Apache Killer' circulates in the wild, say project devs, who promise a patch in 48 hours

Developers of the Apache open-source project today warned users of the popular Web server software that a denial-of-service (DoS) tool is circulating that exploits a bug in the program.

The tool, called "Apache Killer," showed up last Friday in a post to the "Full Disclosure" security mailing list.

Today, the Apache project acknowledged the vulnerability that the attack tool exploits, and said it would release a fix for Apache 2.0 and 2.2 in the next 48 hours.

"A denial of service vulnerability has been found in the way the multiple overlapping ranges are handled by Apache," the group said in a security advisory. According to Apache, all versions in the 1.3 and 2.0 lines are vulnerable to attack.

The group no longer supports the older Apache 1.3.

"An attack tool is circulating in the wild. Active use of this tools has been observed," the advisory stated. "The attack can be done remotely and with a modest number of requests can cause very significant memory and CPU usage on the server."

In lieu of a fix, Apache offered steps administrators can take to defend their Web servers until a patch is available.

According to U.K.-based Netcraft, Apache is the most widely-used Web server software in the world, accounting for 65.2% of all such software currently in use.

Because Apple bundles Apache with Mac OS X -- and maintains the software via its operating system updates -- users running a Mac-based server will have to wait for Apple to deliver a fix.

"It will be interesting to see how Apple rates the bug and how quickly they patch," said Andrew Storms, director of security operations at nCircle, in an interview today via instant messaging.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer, on Google+ or subscribe to Gregg's RSS feed. His e-mail address is gkeizer@computerworld.com.

See more articles by Gregg Keizer.

Read more about security in Computerworld's Security Topic Center.

Join the newsletter!

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

Tags securityNetcraftMalware and Vulnerabilitiesinternet

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

Gregg Keizer

Computerworld (US)
Show Comments

Cool Tech

Breitling Superocean Heritage Chronographe 44

Learn more >

SanDisk MicroSDXC™ for Nintendo® Switch™

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

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

David Coyle

Brother PocketJet PJ-773 A4 Portable Thermal Printer

I rate the printer as a 5 out of 5 stars as it has been able to fit seamlessly into my busy and mobile lifestyle.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?