Aspupload installs exploitable scripts

From: brett@softwarecreations.co.nz
Date: 11/30/01 

Date: 30 Nov 2001 04:52:41 -0000
Message-ID: <20011130045241.6739.qmail@mail.securityfocus.com>
From: <brett@softwarecreations.co.nz>
To: bugtraq@securityfocus.com
Subject: Aspupload installs exploitable scripts
('binary' encoding is not supported, stored as-is)

Title: ASPUPLOAD Installs Exploitable Scripts By
Default
        http://www.aspupload.com/

Author: Brett Moore
        brett@softwarecreations.co.nz

Systems Affected:
        Version 2.1 On Windows
        Version 3.0 Was Not Available For Testing

Release Date: 30/11/2001
Vendor Contacted: 31/10/2001
Vendor Responded:31/10/2001

The problem:
        Sample scripts are installed by default upon
an installation of Aspupload.
        The sample folder is then shared for web
access.
        One of these scripts demonstrates the
capabilities to upload and rename a file.
        The form used in this demonstration has a
hidden field that holds the name of the
        the new uploaded file.
        The script is hard coded to upload to
c:\upload but because there is no checking
        for ../ in the file save code we can traverse
outside this folder and place the
        file anywhere on the drive.
        This is limited to folders on c:\ in the case
of this sample file.
        Another script allows directory browsing
and file downloading.

Risk:
        Attackers can easily browse and download
any file on the system with the rights
        of the web server.
        Attackers can upload files to the server and
run them from executable web folders.
       
Details:
        Download:
        http://www.aspupload.com
        Samples Installed To: C:\Program
Files\Persits Software\AspUpload\Samples

        Vulnerable Script: UploadScript11.asp
        Vulnerable Form: Test11.asp

        Vulnerable Code:
                Path = "c:\upload\" & Upload.Form
("Filename")
                File.SaveAs Path

        Vulnerable Script: DirectoryListing.asp

Vendor Replied:
        "Most potentially dangerous features can be
disabled by the system admin via
        registry settings. It is described in the
manual."


Quick Fix:
        Sample scripts should never be installed on
a live server. Unfortunately there is
        no option when installing aspupload. The
sample files should be removed.

Recommendation:
        In the help file it does indeed have registry
settings for restricting uploads.
        I tested these and it may depend on the
individual setup as to wether this is
        still exploitable.
        If using aspupload in scripts on your server
then we recommend reviewing these
        registry settings and testing for this bug.
        You should ensure that the scripts have
adequate checking for exploits of this type.

Disclaimer:
        It wasn't me