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Kereval Security Advisory [KSA-001]

Multiple vulnerabilities in Tutos
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PROGRAM: Tutos
HOMEPAGE: http://www.tutos.org
VULNERABLE VERSIONS: 1.1
RISK: Medium/High
IMPACT: Cross Site Scripting
RELEASE DATE: 2003-06-20

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TABLE OF CONTENTS
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1..........................................................DESCRIPTION
2..............................................................DETAILS
3.............................................................EXPLOITS
4............................................................SOLUTIONS
5...........................................................WORKAROUND
6........................................................VENDOR STATUS
7..............................................................CREDITS
8...........................................................DISCLAIMER
9...........................................................REFERENCES
10............................................................FEEDBACK

1. DESCRIPTION
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"TUTOS is a tool to manage the the organizational needs of small
groups, teams, departments ...
To do this it provides some web-based tools"

(direct quote from http://www.tutos.org)


2. DETAILS
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¤ Cross Site Scripting :

Many exploitable bugs was found in Tutos which cause script
execution on client's computer by following a crafted url.

This kind of attack known as "Cross-Site Scripting Vulnerability"
is present in many section of the web site, an attacker can input
specially crafted links and/or other malicious scripts.

An attacker can upload a file and execute it on the client's computer.
The browser IE can execute a HTML page without extension.


3. EXPLOITS
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¤ Cross Site Scripting :

http://[target]/tutos/file/file_select.php?msg=<hostile code>

All url with attribute msg...

The hostile code could be :

[script]alert("Cookie="+document.cookie)[/script]

(open a window with the cookie of the visitor.)

(replace [] by <>)

¤ Upload a file with a malicious script

We can upload via http://[target]/tutos/file/file_new.php?link_id=1065

The path is http://[target]/tutos/repository/[project number]/[file
number]/FILE


4. SOLUTIONS
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The Problem is solved for all new releases where the given <hostile
code> is strictly interpreted as NON-HTML code by TUTOS. And most
messages are stored in the sessiondata and no longer in URLs (there was
also a problem with too long URLs)

The version that implements this is available via CVS as BRANCH-1-1
How to get CVS is described on <https://sourceforge.net/cvs/?group_id=8047>


5. WORKAROUND
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¤ Cross Site Scripting :

Use the function php eregi_replace to filter the input data.


6. VENDOR STATUS
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2003-06-20 The vendor has reportedly been notified.
2003-06-23 Response from the vendor with solution.


7. CREDITS
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Discovered by François SORIN <francois.sorin@security-corporation.com>


8. DISLAIMER
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The information within this paper may change without notice. Use of
this information constitutes acceptance for use in an AS IS condition.
There are NO warranties with regard to this information. In no event
shall the author be liable for any damages whatsoever arising out of
or in connection with the use or spread of this information. Any use
of this information is at the user's own risk.


9. REFERENCES
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http://www.security-corporation.com


10. FEEDBACK
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Please send suggestions, updates, and comments to:

Kereval
Immeuble Le Gallium
80, avenue des Buttes de Coesmes
35700 RENNES - FRANCE
info@kereval.com