Feeds

Yet another IIS exploit reported

Pretty nasty, too

  • alert
  • submit to reddit

5 things you didn’t know about cloud backup

It's been a rough two weeks for IIS security. On 1 May it was our solemn duty to report the IIS .printer ISAPI vulnerability; on 8 May we reported the sadmind/IIS worm; and today we have to inform you of a brand new stuff-up affecting IIS 4.0 and 5.0, handily exploited with a simple Unicode trick.

An easily malformed file name can be used to load an executable CGI program through a double-decoding glitch in IIS.

When an obfuscated file name passes the first decoding -- which, among other things, searches for .com and .exe extensions -- a second, superfluous decoding restores the name and grants access to the executable file, handily enabling an attacker to carry out a directory traversal and run arbitrary code outside the Web directory.

The vulnerability enables the execution of arbitrary code, denial of service attacks, and data disclosure -- which is a total drag if you have a file full of credit card details somewhere on your server.

The hole was originally discovered by nsfocus on 27 March. After several delays requested by Microsoft, the announcement was finally made on 15 May.

It's similar to the hole exploited by the sadmind/IIS worm, but potentially more malicious. Lord knows it won't be long before we see this one similarly automated.

Best get those patches in place straight away. ®

Related Links

IIS 4.0 patch
IIS 5.0 patch

Build a business case: developing custom apps

More from The Register

next story
The Return of BSOD: Does ANYONE trust Microsoft patches?
Sysadmins, you're either fighting fires or seen as incompetents now
Linux turns 23 and Linus Torvalds celebrates as only he can
No, not with swearing, but by controlling the release cycle
China hopes home-grown OS will oust Microsoft
Doesn't much like Apple or Google, either
Sin COS to tan Windows? Chinese operating system to debut in autumn – report
Development alliance working on desktop, mobe software
Eat up Martha! Microsoft slings handwriting recog into OneNote on Android
Freehand input on non-Windows kit for the first time
Linux kernel devs made to finger their dongles before contributing code
Two-factor auth enabled for Kernel.org repositories
This is how I set about making a fortune with my own startup
Would you leave your well-paid job to chase your dream?
prev story

Whitepapers

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.
Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Scale data protection with your virtual environment
To scale at the rate of virtualization growth, data protection solutions need to adopt new capabilities and simplify current features.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
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?