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
Computerworld - 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."
The bug was not new. Michal Zalewski, a security engineer who works for Google, pointed out that he had brought up the DOS exploitability of Apache more than four-and-a-half years ago.
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 email@example.com.
Read more about Security in Computerworld's Security Topic Center.
- Radicati: Cloud Business Email - Market Quadrant 2013 Google was named the top cloud business email provider in a recent report by research firm Radicati. Out of 14 key players, Google...
- Tablets in the Enterprise: A Checklist for Successful Deployment How can you enterprise manage and secure tablets in order to protect corporate data while providing access to the information and applications employees...
- Enterprise Mobility: A Checklist for Secure Containerization The advantages and disadvantages of the multiple approaches to containerization. Learn More>>
- Enterprise File Sync & Share Checklist File sync and share has changed the way people work and collaborate in today's tech-savvy world. Gone are the email roadblocks, clunky FTP...
- Live Webcast LIVE EVENT: 5/7, The End of Data Protection As We Know It. Introducing a Next Generation Data Protection Architecture. Traditional backup is going away, but where does this leave end-users?
- LIVE EVENT: 5/7, The End of Data Protection As We Know It. Introducing a Next Generation Data Protection Architecture. Traditional backup is going away, but where does this leave end-users?
- On-demand webinar: "Mobility Mayhem: Balancing BYOD with Enterprise Security" Check out this on-demand webinar to hear Sophos senior security expert John Shier deep dive into how BYOD impacts your enterprise security strategy... All Security White Papers | Webcasts