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tinyServer1.1.txt

tinyServer1.1.txt
Posted Jan 26, 2004
Authored by Donato Ferrante | Site autistici.org

Tiny HTTP Server versions 1.1 and 1.0.5 are vulnerable to directory traversal, denial of service, and cross site scripting bugs. Examples provided.

tags | exploit, web, denial of service, xss
SHA-256 | 94d202695ed7e71eeb74c905557c9600d4fab98f445abaea4f073aba55c6bc8a

tinyServer1.1.txt

Change Mirror Download
                           Donato Ferrante


Application: Tiny Server
http://sourceforge.net/projects/tinyserver

Version: 1.1 (1.0.5)

Bugs: Multiple Vulnerabilities

Author: Donato Ferrante
e-mail: fdonato@autistici.org
web: www.autistici.org/fdonato


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1. Description
2. The bugs
3. The code
4. The fix


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----------------
1. Description:
----------------

Vendor's Description:

"This is a very basic http server. This server can accept multiple
requests at once. The server is only 56 kb. The server has been
configured to accept a maximum of 100 connections.
As of now Tiny Server supports only the GET request."



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-------------
2. The bugs:
-------------

[1] directory traversal bug: the program does't make a good check on
the user input string ( /../ ) so an attacker is able to see and
download all the files on the remote system simply using his
browser.

[2] denial of service bug: the program have no checks on the input
strings received, so an attacker is able to crash the server
simply sending a crafted string.

[3] cross site scripting bug: the program doesn't make a full check
on the strings sent by the client, in fact the input strings are
not filtered and they will appear in the returned page.



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-------------
3. The code:
-------------

The following are some examples to test the vulnerabilities:


[1]

http://[host]/../../windows/system.ini



[2]

GET /index.htm
( without specify HTTP/1.1 )

or simply:

index.htm
( without specify GET and HTTP/1.1 )

or:

GET /aaaaaa[ 260 of a ]aaa HTTP/1.1



[3]

http://[host]/<script>alert("Test")</script>



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------------
4. The fix:
------------

No fix.
The vendor has not answered to my signalations.



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