Threat Level: green Handler on Duty: Russ McRee

SANS ISC: InfoSec Handlers Diary Blog - Microsoft IIS File Parsing Extension Vulnerability InfoSec Handlers Diary Blog


Sign Up for Free!   Forgot Password?
Log In or Sign Up for Free!

Microsoft IIS File Parsing Extension Vulnerability

Published: 2009-12-24
Last Updated: 2009-12-24 22:28:10 UTC
by Guy Bruneau (Version: 1)
0 comment(s)

A vulnerability has been identified in Microsoft Internet Information Services (IIS) where the server in incorrectly handling files with multiple extensions separated by the ";" character such as "malicious.asp;.jpg" as an ASP file. This could allow attackers to upload malicious executables on a vulnerable web server, bypassing file extension protections and restrictions. This vulnerability does not work with ASP.Net.

Pending an IIS security patch, some workaround are available here.
 

-----------

Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot org

0 comment(s)
Diary Archives