Microsoft to issue ASP.net patch out of cycle

Powered by SC Magazine
 

Attackers could steal data.

Microsoft plans to release an emergency patch to plug a major vulnerability in the ASP.net  framework, used by millions of developers to build web applications, the software giant announced.

Limited public exploits began shortly after Microsoft released an advisory last week that acknowledged the flaw.

The bug involves a weakness in the way the ASP.net technology implements encryption that could allow an attacker to tamper with and potentially steal sensitive data, Kevin Brown, a Microsoft engineer, wrote in a blog post. Attackers can send a flood of encrypted messages, known as cipher text, to a targeted server and analyse the error messages they receive to decrypt the rest of the data.

"An attacker who exploited this vulnerability could view data, such as the View State, which was encrypted by the target server, or read data from files on the target server, such as web.config," the Microsoft advisory said. "This would allow the attacker to tamper with the contents of the data. By sending back the altered contents to an affected server, the attacker could observe the error codes returned by the server." 

The vulnerability was disclosed the prior week by security researchers at a hacking conference in Buenos Aires. The researchers demonstrated the ability to exploit the flaw using a tool they released called a Padding Oracle Exploit Tool (POET).

Microsoft then updated a workaround for the issue. But the permanent, out-of-band patch, labeled "important", is coming due to active attacks and continued attempts to evade defences, according to Microsoft.

"The security update is fully tested and ready for release, but will be made available initially only on the Microsoft Download Center," Dave Forstrom, director of Trustworthy Computing at Microsoft, wrote in a blog post. "This enables us to get the update out as quickly as possible, allowing administrators with enterprise installations, or end-users who want to install this security update manually, the ability to test and update their systems immediately."

See original article on scmagazineus.com

Copyright © SC Magazine, US edition


Microsoft to issue ASP.net patch out of cycle
 
 
 
Top Stories
Content, cost & constant innovation: How Foxtel plans to take on Netflix
Nell Payne inhabits the “brave new world of blue strings and networking”. Just don't ask her to put a TV screen on your microwave.
 
Sending in the drones
Margins are getting tighter in the industrial services industry, so Transfield Services' Stephen Phillips looks offshore - and to the skies - for the solutions he needs to keep pace.
 
Westpac fires starting pistol on core banking upgrade
St George readies itself for move to Celeriti.
 
 
Sign up to receive iTnews email bulletins
   FOLLOW US...
Latest articles on BIT Latest Articles from BIT
Microsoft launches Office for Android preview
May 22, 2015
Microsoft has launched a preview of Office for Android smartphones. Pre-release versions of ...
Microsoft is working on an iOS email chat feature called Flow
May 22, 2015
Microsoft is working on a new chat app, but at the moment we know more about what we DON'T know, ...
Windows 10 free upgrade: Microsoft details who gets what
May 22, 2015
Microsoft was meant to be streamlining its OS with Windows 10, so why is upgrading so confusing? ...
Windows 10 has an edition to suit everyone's needs
May 15, 2015
Microsoft unveils a mind-melting six editions of Windows 10 ahead of its Winter 2015 launch. ...
Firefox 38 FINAL released, debuts new tab-based preferences
May 13, 2015
Mozilla has unveiled the latest version of Firefox 38.0 FINAL for desktop, with Firefox for ...
Latest Comments
Polls
Should Optus make a bid for iiNet?

   |   View results
Yes
  43%
 
No
  57%
TOTAL VOTES: 536

Vote