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iis5x60.txt

iis5x60.txt
Posted Oct 13, 2004
Authored by Amit Klein, Ory Segal aka Watchfire

Microsoft IIS 5.x and 6.0 suffer from a denial of service vulnerability regarding the WebDAV XML parser. An attacker can craft a malicious WebDAV PROPFIND request, which uses XML attributes in a way that inflicts a denial of service condition on the target machine (IIS web server). The result of this attack is that the XML parser consumes all the CPU resources for a long period of time (from seconds to minutes, depending on the size of the payload).

tags | advisory, web, denial of service
SHA-256 | 86be4f9097197602acfd076c6401bace0c652dc337ac4d228bd232c9ba16c4cb

iis5x60.txt

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////////////////////////////////////////////////////////////////////
//====================>> Security Advisory <<=====================//
////////////////////////////////////////////////////////////////////

--------------------------------------------------------------------
-----[ IIS 5.x/6.0 WebDAV (XML parser) attribute blowup DoS
--------------------------------------------------------------------

--[ Author: Amit Klein

--[ Release Date: October 12, 2004

--[ Products:

Microsoft IIS/5.0 (Windows/2000)
Microsoft IIS/5.1 (Windows XP)
Microsoft IIS/6.0 (Windows/2003)

--[ Severity: High

--[ Description

An attacker can craft a malicious WebDAV PROPFIND request, which
uses XML attributes in a way that inflicts a denial of service
condition on the target machine (IIS web server).
The result of this attack is that the XML parser consumes all the
CPU resources for a long period of time (from seconds to minutes,
depending on the size of the payload). In our experiments, we were
able to send attacks (of few hunderd KBs) that caused the target
machines to consume 100% CPU for several minutes.

--[ Solution

Microsoft security bulletin MS04-030 (October 12th, 2004)
http://www.microsoft.com/technet/security/bulletin/MS04-030.mspx

--[ Acknowledgements
To Ory Segal (Watchfire), for the his help with applying this
attack to IIS.


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