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Date: Fri, 21 Nov 2003 00:17:16 -0800
From: "Tri Huynh" <>
To: <>, <>
Cc: <>, <>
Subject: Xitami Denial of Service in Handling malformed request

Xitami Denial of Service in Handling malformed request



LiteServe is a very powerful, full-featured, open-sourced Web server.
and the flagship of iMatix. This is a great free product.


Xitami has a logical error in the way it handles POST request that can be
used to perform a Denial-of-service attack. An Request like this will
make the server won't response to any other requests although it is
still listen to port 80
POST /forum/index.php HTTP/1.1
Referer: Sentryunion
Accept-Encoding: None
User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)
Content-Length: 10
(long string here)
0x0D 0x0A
(another long string here)
Xitami is a very good server. However the code to handle parsing the HTTP
header doesn't have a good logic:

while(header && *header && *header != '\r')
header_name = header
if((header_value=strchr(header_name, ":")) != NULL)
{ ... header++;}
So if inside the request HTTP header there is no ":" charater. It will make
while loop runs forever = Denial of Service.

Use URL filter to filter all the bad request. Vendor doesn't response
after 2 weeks !


Discovered by Tri Huynh from Sentry Union


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