Home / Advisories / KLCERT advisories / KLCERT-20-025: Rockwell Automation ISaGRAF Runtime: Information Disclosure due to Hard-coded Cryptographic Key

KLCERT-20-025: Rockwell Automation ISaGRAF Runtime: Information Disclosure due to Hard-coded Cryptographic Key

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KLCERT-ID KLCERT-20-025
CVE CVE-2020-25180
CWE CWE-321: Use of Hard-coded Cryptographic Key
Publication date 2021-07-13
Researcher Alexander Nochvay
Description

ISaGRAF Runtime and ISaGRAF Workbench use Tiny Encryption Algorithm (TEA) algorithm with fixed keys to encrypt transmitted passwords over IXL protocol.

Impact

A remote attacker is able to decrypt passwords captured during Man-in-the-Middle attack.

Severity
CVSS v3 Base Score 5.3 (Medium)
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Exploitability ⚠ Remotely exploitable: network access to port 1131/TCP is required
Difficulty High skill level to exploit: an attacker must perform Man-in-the-Middle attack
Privilege required ⚠ No privileges required
User interaction User interaction required: a user must communicates over IXL protocol
Confidentiality ⚠ Confidentiality of the system may be seriously affected
Affected products
Affected products
  • AADvance Controller:
    • All firmware versions
  • Based on ISaGRAF Runtime 5 controllers:
    • All software versions
  • ISaGRAF Free Runtime:
    • All software versions
Mitigation
Rockwell Automation mitigation

To reduce risk, customers should ensure they are employing proper network segmentation and security controls. Specifically, network exposure for all control system devices should be minimized, and control systems should be behind firewalls and isolated from other networks when possible. Refer to the Converged Plantwide Ethernet (CPwE) Design and Implementation Guide for best practices deploying network segmentation and broader defense-in-depth strategies.

Customers should consider using proper network infrastructure controls, such as firewalls, UTM devices, VPN, or other security appliance.

For ISaGRAF, restrict or block traffic on TCP 1131 from outside of the industrial control system network zone. For more information on the TCP/UDP ports used by ISaGRAF refer to product documentation.

Since ISaGRAF 5 Runtime is provided to a customer as a development kit, implementing least-privilege may vary from implementation to implementation based on the hardware in use.

For AADvance controllers, customers are encouraged to restrict or block traffic on TCP 1132 from outside of the industrial control system network zone.1


  1. For more information on the TCP/UDP ports used by Rockwell Automation products, see BF7490.↩︎

Timeline 2020-02-21 – Vulnerability reported
2020-03-11 – Rockwell Automation confirmed the vulnerability
2021-06-08 – Rockwell Automation published the advisory
2021-06-17 – ICS CERT published the advisory