[ python-Bugs-1100201 ] Cross-site scripting on BaseHTTPServer

Tue Jan 11 16:04:06 CET 2005

Bugs item #1100201, was opened at 2005-01-11 15:04
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
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Category: Extension Modules
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Paul Johnston (paj28)
Assigned to: Nobody/Anonymous (nobody)
Summary: Cross-site scripting on BaseHTTPServer

Initial Comment:
Hi,

There is a minor XSS flaw in BaseHTTPServer, in the
default error message, if you try connecting with a bad
method name, e.g.:

pugsley:/srv/www/htdocs # telnet risk 8000
Trying 192.168.3.52...
Connected to risk.
Escape character is '^]'.
<SCRIPT>alert('hello')</SCRIPT> / HTTP/1.0

HTTP/1.0 501 Unsupported method
("<SCRIPT>alert('hello')</SCRIPT>")
Server: SimpleHTTP/0.6 Python/2.3.4
Date: Tue, 11 Jan 2005 15:02:48 GMT
Content-Type: text/html
Connection: close

<head>
<title>Error response</title>
</head>
<body>
<h1>Error response</h1>
<p>Error code 501.
<p>Message: Unsupported method
("<SCRIPT>alert('hello')</SCRIPT>").
<p>Error code explanation: 501 = Server does not
support this operation.
</body>
Connection closed by foreign host.

This is not likely to be a major security risk, but
ideally it should be fixed. In addition it may be that
other error messages exhibit this flaw, I haven't done
a code audit.

Credit for discovery: Richard Moore

Best wishes,

Paul

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