Feeds

Microsoft IIS hole fells university server

Hackers find zero-day bug irresistible

Beginner's guide to SSL certificates

Updated This story was updated at 21st May 2009 05:01 GMT to include Microsoft comments refuting the university's claims that the IIS vulnerability was exploited in the attack. It was updated again at 21st May 2009 23:10 GMT to note that University officials have recanted their claims. Please see this updated story.

Hackers have wasted no time targeting a gaping hole in Microsoft's Internet Information Services webserver, according to administrators at Ball State University, who say servers that used the program were breached on Monday.

As of Wednesday morning California time, iWeb accounts at the Muncie, Indiana-based university remained inaccessible and service wasn't expected to be restored until Thursday or Friday, Patty Lucas, a senior help desk support admin for Ball State's Computing Services said. University administrators were working with Microsoft employees to investigate and fix the break in.

About seven hours after this story was first published, a Microsoft statement refuted the claims, which university officials first aired on Tuesday on its website.

"Microsoft has investigated a public report of a targeted attack on the Internet Information Services (IIS) vulnerability addressed in Security Advisory 971492," the statement read. "Our investigation revealed that the vulnerability was not exploited to accomplish this attack. Microsoft is still not aware of attacks that are trying to use this vulnerability or of customer impact at this time."

On Monday, Microsoft confirmed what it called an "elevation of privilege vulnerability" in versions 5 and 6 of IIS when it runs an extension known as WebDAV. Microsoft said at the time it was unaware of any in-the-wild exploits of the vulnerability. The assessment was at odds with this warning in which the US Computer Emergency Response Team said it was aware of "publicly available exploit code and active exploitation of this vulnerability."

The flaw is significant because it allows anyone with a web browser to list, access, and possibly upload files in a password-protected WebDAV folder on a vulnerable machine, according to Nikolaos Rangos, a security researcher who published his findings on Friday. The bug resides in the part of IIS that processes commands based on the WebDAV protocol.

By adding several unicode characters - specifically "%c0%af" - to a web address, attackers can trick the widely used webserver into accessing parts of the system that are supposed to be off limits to outsiders.

Microsoft's advisory correctly points out that several conditions make the vulnerability hard to exploit in some cases. For one, WebDAV is not enabled by default in IIS6, and for another, intruders would not be able to exceed the privileges of an anonymous user. By default, such accounts are not permitted to upload files to a server.

But based on Lucas's description, the Ball State hackers may have been able to do just that. Shortly after the attack, students checking their iWeb pages were greeted with a message that said they had been hacked. There are no indications any data was stolen or malicious files uploaded, she said. ®

Intelligent flash storage arrays

More from The Register

next story
Knock Knock tool makes a joke of Mac AV
Yes, we know Macs 'don't get viruses', but when they do this code'll spot 'em
Shellshock over SMTP attacks mean you can now ignore your email
'But boss, the Internet Storm Centre says it's dangerous for me to reply to you'
Why weasel words might not work for Whisper
CEO suspends editor but privacy questions remain
Feds seek potential 'second Snowden' gov doc leaker – report
Hang on, Ed wasn't here when we compiled THIS document
DEATH by PowerPoint: Microsoft warns of 0-day attack hidden in slides
Might put out patch in update, might chuck it out sooner
China is ALREADY spying on Apple iCloud users, claims watchdog
Attack harvests users' info at iPhone 6 launch
prev story

Whitepapers

Choosing cloud Backup services
Demystify how you can address your data protection needs in your small- to medium-sized business and select the best online backup service to meet your needs.
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.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
New hybrid storage solutions
Tackling data challenges through emerging hybrid storage solutions that enable optimum database performance whilst managing costs and increasingly large data stores.
Business security measures using SSL
Examines the major types of threats to information security that businesses face today and the techniques for mitigating those threats.