ESB-2018.2114 - [Win][Appliance] AVEVA Products: Execute arbitrary code/commands - Remote/unauthenticated 2018-07-20

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2114
         Advisory (ICSA-18-200-01): AVEVA InduSoft Web Studio and
                          InTouch Machine Edition
                               20 July 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           AVEVA InduSoft Web Studio
                   AVEVA InTouch Machine Edition
Publisher:         ICS-CERT
Operating System:  Network Appliance
                   Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10620  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-200-01

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Advisory (ICSA-18-200-01)
AVEVA InduSoft Web Studio and InTouch Machine Edition
Original release date: July 19, 2018

Legal Notice

All information products included in http://ics-cert.us-cert.gov are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the
header. For more information about TLP, see http://www.us-cert.gov/tlp/.

1. EXECUTIVE SUMMARY

CVSS v3 9.8
ATTENTION: Exploitable remotely/low skill level to exploit.
Vendor: AVEVA Software, LLC (AVEVA)
Equipment: InduSoft Web Studio and InTouch Machine Edition
Vulnerabilities: Stack-based buffer overflow

2. RISK EVALUATION

The listed products are vulnerable only if the TCP/IP Server Task is
enabled. A remote attacker could send a carefully crafted packet during
a tag, alarm, or event related action such as read and write, which may
allow remote code execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of InduSoft Web Studio and InTouch Machine Edition,
an HMI, are affected:

InduSoft Web Studio v8.1 and v8.1SP1, and
InTouch Machine Edition v2017 8.1 and v2017 8.1 SP1

3.2 VULNERABILITY OVERVIEW

3.2.1    STACK-BASED BUFFER OVERFLOW CWE-121

A remote user could send a carefully crafted packet to exploit a stack-based
buffer overflow vulnerability during tag, alarm, or event related actions
such as read and write, with potential for code to be executed.

CVE-2018-10620 has been assigned to this vulnerability. A CVSS v3
base score of 9.8 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical
Manufacturing, Energy, Transportation Systems, and Water and Wastewater Systems
COUNTRIES/AREAS DEPLOYED: Worldwide
COMPANY HEADQUARTERS LOCATION: United Kingdom

3.4 RESEARCHER

Tenable Research reported this vulnerability to AVEVA and AVEVA reported
it to NCCIC.

4. MITIGATIONS

Users of InduSoft Web Studio v8.1 SP1 are affected and should apply InduSoft
Web Studio Hotfix 81.1.00.08 as soon as possible. Users of InduSoft Web
Studio v8.1 are also affected and should first upgrade to InduSoft Web
Studio v8.1 SP1 and then apply the hotfix.

Users of InTouch Machine Edition 2017 v8.1 SP1 are affected and should
apply InTouch Machine Edition Hotfix 81.1.00.08 as soon as possible. Users
of InTouch Machine Edition 2017 v8.1 are also affected and should first
upgrade to InTouch Machine Edition 2017 v8.1 SP1 and then apply the hotfix.

Software security updates:

http://www.indusoft.com/File-Management?Command=Core_Download&EntryId=2074

https://softwaresupportsp.schneider-electric.com/#/producthub/details?id=5063

To identify which version of InduSoft Web Studio or InTouch Machine Edition
you have installed:

Windows Desktop or Server operating system: Navigate to Windows Programs
and Features, locate the "InduSoft Web Studio" or "InTouch Machine
Edition" entries to review the displayed installed version.
On a Windows Embedded operating system: navigate to the Bin folder in the
installation location of InduSoft Web Studio or InTouch Machine Edition
and open the file "CEView.ini". The installed version can be observed
from the "version=*.*.*" attribute within the file.

AVEVA's security bulletin LFSEC00000128 is available at the following
location:

https://sw.aveva.com/hubfs/assets-2018/pdf/security-bulletin/SecurityBulletin_LFSec128(002).pdf

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies.

Additional mitigation guidance and recommended practices are publicly
available on the ICS-CERT website in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies.

Organizations observing any suspected malicious activity should follow
their established internal procedures and report their findings to NCCIC
for tracking and correlation against other incidents.

No known public exploits specifically target this vulnerability.

Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:
http://ics-cert.us-cert.gov
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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