Attack code published for serious ASP.NET DoS vulnerability

Exploit code for a denial-of-service vulnerability in ASP.NET was published on GitHub

Exploit code for a recently patched denial-of-service (DoS) vulnerability that affects Microsoft's ASP.NET Web development platform has been published online, therefore increasing the risk of potential attacks.

The vulnerability, identified as CVE-2011-3414, was disclosed in December at the Chaos Communication Congress, Europe's largest and oldest hacker conference. Shortly afterward Microsoft published a security advisory and released an out-of-band patch for the flaw.

The type of attack facilitated by this vulnerability affects other Web application platforms as well and each of them has its own mitigation instructions. "This vulnerability could allow an anonymous attacker to efficiently consume all CPU resources on a web server, or even on a cluster of web servers," explained Suha Can and Jonathan Ness, two Microsoft Security Response Center (MSRC) engineers, in a blog post back in December.

"For ASP.NET in particular, a single specially crafted ~100kb HTTP request can consume 100% of one CPU core for between 90 -- 110 seconds. An attacker could potentially repeatedly issue such requests, causing performance to degrade significantly enough to cause a denial of service condition for even multi-core servers or clusters of servers," they said.

On Friday, a user who calls himself HybrisDisaster, published a proof-of-concept (PoC) exploit for the ASP.NET vulnerability on GitHub, a platform that hosts open source development projects.

In the notes accompanying the exploit code, HybrisDisaster encourages people to download it, use it how they see fit and spread it. He also signs off with "We are Legion. Expect us," a slogan commonly associated with the Anonymous hacktivist collective.

HybrisDisaster did not immediately return a request for comment about his affiliation with Anonymous. However, over the years, the well-known hacktivist group regularly used DoS attacks to support of its operations, it's members considering the activity a legitimate form of online protesting.

The high likelihood of someone releasing attack code for this vulnerability played an important part in Microsoft's decision to release an out-of-band patch. "We anticipate the imminent public release of exploit code," Can and Ness said shortly after the vulnerability was disclosed.

Webmasters who maintain ASP.NET Web applications should immediately deploy the patches in Microsoft's MS11-100 security bulletin, which also address other ASP.NET vulnerabilities as well.

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Lucian Constantin

IDG News Service
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

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

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?