Feeds

MS emergency fix plugs ASP.Net web development hole

Yellow alert over severe server peril

Internet Security Threat Report 2014

Microsoft has released an out-of-cycle patch designed to address a serious flaw in its ASP.Net web application development toolkit.

The vulnerability, which has been under active attack for several weeks, creates a mechanism for attackers to read any file on a web application server. Microsoft rates the flaw as only "important", while independent security watchers such the the SANS Institute's Internet Storm Centre say that rating underestimates the risk posed by the flaw to online shops built using Microsoft's developer tools. The ISC has raised the InfoCon status of the flaw from green to yellow.

Microsoft's advisory provides more detail on the "information disclosure" flaw. It explains that "in Microsoft .NET Framework 3.5 Service Pack 1 and above, this vulnerability can be used by an attacker to retrieve the contents of any file within the ASP.NET application, including web.config"  and that "this vulnerability can also be used for data tampering, which, if successfully exploited, could be used to decrypt and tamper with the data encrypted by the server".

Redmond decided the problem was too severe to wait for the next scheduled Patch Tuesday, 12 October, meriting an unusual but not unprecedented decision to release an out-of-cycle patch (MS10-070) instead.

The vulnerability stems from a cryptographic weakness, specifically involving improper error handling during encryption padding verification.

Attacks based on this weakness could allow a hacker to decrypt sniffed cookies or forge authentication tickets, among other attacks. Researchers Thai Duong and Juliano Rizzo discovered the flaw and presented a Padding Oracle Exploit Tool that illustrated the risk during a presentation at the Ekoparty conference in Argentina last month. ®

Internet Security Threat Report 2014

More from The Register

next story
George Clooney, WikiLeaks' lawyer wife hand out burner phones to wedding guests
Day 4: 'News'-papers STILL rammed with Clooney nuptials
Shellshock: 'Larger scale attack' on its way, warn securo-bods
Not just web servers under threat - though TENS of THOUSANDS have been hit
Apple's new iPhone 6 vulnerable to last year's TouchID fingerprint hack
But unsophisticated thieves need not attempt this trick
PEAK IPV4? Global IPv6 traffic is growing, DDoS dying, says Akamai
First time the cache network has seen drop in use of 32-bit-wide IP addresses
Oracle SHELLSHOCKER - data titan lists unpatchables
Database kingpin lists 32 products that can't be patched (yet) as GNU fixes second vuln
Researchers tell black hats: 'YOU'RE SOOO PREDICTABLE'
Want to register that domain? We're way ahead of you.
Stunned by Shellshock Bash bug? Patch all you can – or be punished
UK data watchdog rolls up its sleeves, polishes truncheon
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
The next step in data security
With recent increased privacy concerns and computers becoming more powerful, the chance of hackers being able to crack smaller-sized RSA keys increases.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.