ASP.Net glitch discovered

Microsoft is investigating a reported vulnerability in its ASP.NET that could allow an attacker to bypass security features on a Web server and view sensitive content, the company said Thursday.

The company published an advisory for Web site administrators on the vulnerability on Tuesday and provided instructions for mitigating the effects of the hole, which is in a component of ASP.NET called the "canonicalization routine." Attackers could create URLs (uniform resource locators) that are specially designed to exploit the flaw, enabling them to bypass authentication or Windows authorization on Web applications that use ASP.NET, Microsoft said.

ASP.NET is the latest version of Microsoft's Active Server Page (ASP) technology, which allows developers to create Web-based applications by embedding small programs, written in a variety of languages such as Visual Basic, Perl and C#, in Web pages, which are then transmitted to users.

The canonicalization routine is a process that interprets URL requests for content on a Web server and determines the proper way to respond for those requests. For example, there is more than one way to refer to the location of a file, such as homepage.html, on a Web server. The canonicalization routine interprets the information in a URL to determine what page the URL is asking for, according to information on the Microsoft Web page.

The vulnerability affects all versions of ASP.NET, including versions running on Windows 2000, Windows 2000 Server, XP Professional and Windows Server 2003, Microsoft said. (See: http://www.microsoft.com/security/incident/aspnet.mspx.)

On Thursday, Microsoft released a small software module called the Microsoft ASP.NET ValidatePath module (VPModule.msi) that can be applied to Internet Information Server 5.0, 5.1 or 6.0 Web servers and will prevent exploitation of the ASP.NET vulnerability. The company is also working on a security patch for the vulnerability, it said.

The company also recommended that Web site owners review its knowledge base for suggestions on ways to program checks for problems with URL canonicalization. (See: http://support.microsoft.com/?kbid=887459.)

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Paul Roberts

IDG News Service
Show Comments

Cool Tech

Bang and Olufsen Beosound Stage - Dolby Atmos Soundbar

Learn more >

Toys for Boys

Sony WF-1000XM3 Wireless Noise Cancelling Headphones

Learn more >

ASUS ROG, ACRONYM partner for Special Edition Zephyrus G14

Learn more >

Nakamichi Delta 100 3-Way Hi Fi Speaker System

Learn more >

Family Friendly

Mario Kart Live: Home Circuit for Nintendo Switch

Learn more >

Philips Sonicare Diamond Clean 9000 Toothbrush

Learn more >

Stocking Stuffer

Teac 7 inch Swivel Screen Portable DVD Player

Learn more >

SunnyBunny Snowflakes 20 LED Solar Powered Fairy String

Learn more >

Christmas Gift Guide

Click for more ›

Brand Post

Shining a light on creativity

MSI has long pushed the boundaries of invention with its ever-evolving range of laptops but it has now pulled off a world first with the new MSI Creative 17.

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?