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Date: Fri, 1 Sep 2017 05:07:55 +0530
From: Karn Ganeshen <karnganeshen@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] [ICS] Moxa SoftNVR-IA Live Viewer – Insecure Library Loading Allows Code Execution

Vendor: Moxa
Equipment: SoftNVR-IA Live Viewer
Vulnerability: Uncontrolled Search Path Element

Advisory URL:
https://ipositivesecurity.com/2017/09/01/ics-moxa-softnvr-ia-live-viewer-insecure-library-loading-allows-code-execution/

ICS-CERT Advisory
https://ics-cert.us-cert.gov/advisories/ICSA-17-220-02

------------------------
AFFECTED PRODUCTS
------------------------
The following versions of SoftNVR-IA Live Viewer, a video surveillance
software designed for industrial automation systems, are affected:

SoftNVR-IA Live Viewer, Version 3.30.3122 and prior versions.

------------------------
BACKGROUND
------------------------
Critical Infrastructure Sector(s): Critical Manufacturing, Energy, and
Transportation Systems.
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Taiwan

------------------------
IMPACT
------------------------
Successful exploitation of this vulnerability may allow an attacker to
execute code from a malicious DLL on the affected system with the same
privileges as the user running the program.

------------------------
VULNERABILITY OVERVIEW
------------------------

UNCONTROLLED SEARCH PATH ELEMENT CWE-427
An uncontrolled search path element vulnerability has been identified,
which may execute malicious DLL files that have been placed within the
search path.

By placing specific DLL file(s), an attacker is able to force the process
to load an arbitrary DLL. This allows an attacker to execute arbitrary code
in the context of the process when it is run.

CVE-2017-5170 has been assigned to this vulnerability. A CVSS v3 base score
of 7.2 has been assigned; the CVSS vector string is
(AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H).

------------------------
Missing Libraries
------------------------
msjet48.dll
msjet47.dll
msjet46.dll
msjet45.dll
msjet44.dll
msjet43.dll
msjet42.dll
msjet41.dll
msjter49.dll
msjter48.dll
msjter47.dll
msjter46.dll
msjter45.dll
msjter44.dll
msjter43.dll
msjter42.dll
msjter41.dll

------------------------
Application Executables (that look for missing DLL)
------------------------
SoftNVRIA.exe

------------------------
Steps to reproduce
------------------------
1. Generate a dll payload
msfvenom –p windows/exec cmd=calc.exe –f dll –o msjter41.dll

2. Place this dll in any directory defined in the PATH environment variable
C:\app-folder-RW\

3. Run SoftNVRIA.exe, and Exit

Note: Few DLLs are loaded when the application starts, while few are loaded
when the application is exited. Thus, code execution can happen at the
start or at exit time of the application run.

+++++
Best Regards,
Karn Ganeshen

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