ESB-2019.0636 - [Appliance] PSI Telecontrol Gateway, PSI Smart Telecontrol Unit family and PSI IEC104 Security Proxy: Cross-site scripting - Existing account 2019-03-01

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0636
           Advisory (ICSA-19-059-01) PSI GridConnect Telecontrol
                               1 March 2019

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

Product:           PSI Telecontrol Gateway
                   PSI Smart Telecontrol Unit family
                   PSI IEC104 Security Proxy
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Cross-site Scripting -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6528  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-059-01

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Advisory (ICSA-19-059-01)

PSI GridConnect Telecontrol

Original release date: February 28, 2019

Legal Notice

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For more information about TLP, see http://www.us-cert.gov/tlp/ .

1. EXECUTIVE SUMMARY

  o CVSS v3 8.5
  o ATTENTION: Remotely exploitable/low skill level to exploit
  o Vendor: PSI GridConnect GmbH (formerly known as PSI Nentec GmbH)
  o Equipment: Telecontrol Gateway and Smart Telecontrol Unit family, IEC104
    Security Proxy
  o Vulnerability: Cross-site Scripting

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an attacker to
execute dynamic scripts in the context of the application, which could allow
cross-site scripting attacks.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following products are affected:

  o Telecontrol Gateway 3G Versions 4.2.21, 5.0.27, 5.1.19, 6.0.16 and prior;
  o Telecontrol Gateway XS-MU Versions 4.2.21, 5.0.27, 5.1.19, 6.0.16 and
    prior;
  o Telecontrol Gateway VM Versions 4.2.21, 5.0.27, 5.1.19, 6.0.16 and prior;
  o Smart Telecontrol Unit TCG Versions 5.0.27, 5.1.19, 6.0.16 and prior; and
  o IEC104 Security Proxy Version 2.2.10 and prior.

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79

The web application browser interprets input as active HTML, JavaScript, or
VBScript, which could allow an attacker to execute arbitrary code.

CVE-2019-6528 has been assigned to this vulnerability. A CVSS v3 base score of
8.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/
C:H/I:L/A:N ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Energy
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

M. Can Kurnaz reported this vulnerability to NCCIC. NCCICcoordinated with BSI
Germany.

4. MITIGATIONS

PSI recommends users of affected devices update their devices to a version
where this vulnerability is patched.

To obtain the update, contact PSI GridConnect via email at:
support@psigridconnect.com . A fix for the vulnerability is available in the
following software releases:

  o 5.1.20,
  o 6.0.17, and
  o IEC104 Security Proxy Version 2.2.11

The following software releases are no longer supported:

  o 4.2.x, and
  o 5.0.x

PSI recommends deactivating the webserver via CLI since the web interface is
not essential to the configuration of the device.

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

  o Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet .
  o Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  o 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.

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