Feeds

DoS bug bites Microsoft's first security product

It was only a question of time

  • alert
  • submit to reddit

Using blade systems to cut costs and sharpen efficiencies

A flaw with Microsoft's first security product leaves it vulnerable to denial of service attacks.

The problem arises because Microsoft's Internet Security and Acceleration (ISA) Server's Web Proxy service doesn't handle particular requests if they exceed a certain length, causing the program to crash if its Web Publishing features are enabled.

In a security notice, Microsoft admitted: "Processing such a [malformed] request would result in an access violation, which would cause the Web Proxy service to fail. This would disrupt all ingoing and outgoing Web proxy requests until the service was restarted."

Although this means that a hacker might be able to mount a denial of service attack, it would not allow an attacker to take control of the firewall or access the systems it is meant to protect.

Still, the flaw is embarrassing for Microsoft, which has heavily promoted ISA Server as an enterprise firewall and Web cache, and now finds itself (ironically) dealing with a security problem with its own security product.

Microsoft has made a patch available to address the vulnerability and advised administrators using Web Publishing to apply it immediately. The fix will also be included in the first service pack of ISA Server.

Web Publishing allows external users to access internal Web sites without exposing the actual address of the sites, and is likely to be widely used. This bug was discovered by security researchers at FSC Internet and SecureXpert Labs. ®

Related Link

Microsoft's security bulletin

Boost IT visibility and business value

More from The Register

next story
Secure microkernel that uses maths to be 'bug free' goes open source
Hacker-repelling, drone-protecting code will soon be yours to tweak as you see fit
How long is too long to wait for a security fix?
Synology finally patches OpenSSL bugs in Trevor's NAS
Roll out the welcome mat to hackers and crackers
Security chap pens guide to bug bounty programs that won't fail like Yahoo!'s
HIDDEN packet sniffer spy tech in MILLIONS of iPhones, iPads – expert
Don't panic though – Apple's backdoor is not wide open to all, guru tells us
Researcher sat on critical IE bugs for THREE YEARS
VUPEN waited for Pwn2Own cash while IE's sandbox leaked
Four fake Google haxbots hit YOUR WEBSITE every day
Goog the perfect ruse to slip into SEO orfice
Putin: Crack Tor for me and I'll make you a MILLIONAIRE
Russian Interior Ministry offers big pile o' roubles for busting pro-privacy browser
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Securing Web Applications Made Simple and Scalable
Learn how automated security testing can provide a simple and scalable way to protect your web applications.