Feeds

MS emergency fix plugs ASP.Net web development hole

Yellow alert over severe server peril

The essential guide to IT transformation

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. ®

Next gen security for virtualised datacentres

More from The Register

next story
Ice cream headache as black hat hacks sack Dairy Queen
I scream, you scream, we all scream 'DATA BREACH'!
Goog says patch⁵⁰ your Chrome
64-bit browser loads cat vids FIFTEEN PERCENT faster!
NIST to sysadmins: clean up your SSH mess
Too many keys, too badly managed
Scratched PC-dispatch patch patched, hatched in batch rematch
Windows security update fixed after triggering blue screens (and screams) of death
Researchers camouflage haxxor traps with fake application traffic
Honeypots sweetened to resemble actual workloads, complete with 'secure' logins
Attack flogged through shiny-clicky social media buttons
66,000 users popped by malicious Flash fudging add-on
New Snowden leak: How NSA shared 850-billion-plus metadata records
'Federated search' spaffed info all over Five Eyes chums
Three quarters of South Korea popped in online gaming raids
Records used to plunder game items, sold off to low lifes
Oz fed police in PDF redaction SNAFU
Give us your metadata, we'll publish your data
prev story

Whitepapers

5 things you didn’t know about cloud backup
IT departments are embracing cloud backup, but there’s a lot you need to know before choosing a service provider. Learn all the critical things you need to know.
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.
Backing up Big Data
Solving backup challenges and “protect everything from everywhere,” as we move into the era of big data management and the adoption of BYOD.
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.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?