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Firefox chrome: URL Handling Directory Traversal

SUMMARY

Firefox doesn't properly handle escaped characters. It is possible to load
any JavaScript file on a victims machine. This attack is similar to
previously disclosed vulnerabilities but is not constrained to basic
Firefox files.

DETAILS

Vulnerable Systems:

• Firefox version 2.0.0.11

To exploit this the victim needs to have an extension installed that does
not store its contents in a jar archive (such as the Download Statusbar).
Gerry created a demo that will read the Mozilla Thunderbird preferences
file all.js (C:\Program Files\Mozilla Thunderbird\greprefs\all.js).

This looks very interesting and may have bigger potential, but for now,
its just another information disclosure.

Proof of concept:
<script>pref = function(x, y){document.write(x + ' -> ' + y +
'<br>');};</script>
<script
src='chrome://downbar/content/%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e
%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2f%2e%2e%2fProgram%20Files
%2fMozilla%20Thunderbird%2fgreprefs%2fall.js'></script>

ADDITIONAL INFORMATION

The information has been provided by Gerry Eisenhaur.
The original article can be found at:
<http://www.hiredhacker.com/2008/01/19/firefox-chrome-url-handling-directory-traversal/&gt;
http://www.hiredhacker.com/2008/01/19/firefox-chrome-url-handling-directory-traversal/

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