OSEC

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Subject: Doubledot bug in FrontPage FrontPage Personal Web Server.
From: Jan van de Rijt (rijtWISH.NET)
Date: Tue Feb 15 2000 - 17:15:51 CST


Description: Doubledot bug in FrontPage FrontPage Personal Web Server.
Compromise: Accessing drive trough browser.
Vulnerable Systems: Frontpage-PWS32/3.0.2.926 other versions not tested.
Details:
When FrontPage-PWS runs a site on your c:\ drive your drive could be accessed by any user accessing your page, simply by requesting any file in any directory except the files in the FrontPage dir. specially /_vti_pvt/.

How to exploit this bug?
Simply adding /..../ in the URL addressbar.

http://www.target.com/..../>/<any_file>

so by requesting http://www.target.com/..../Windows/Admin.pwl the webserver let us download the .pwl file from the target.

Files and dirs. with the hidden attribute set are vulnerable.

Solution:
The best solution is installing FrontPage on a drive that doesn't contain Private information.

Greetings,

Jan van de Rijt aka The Warlock.