Lucene search

K
icsIndustrial Control Systems Cyber Emergency Response TeamICSA-22-335-02
HistoryDec 01, 2022 - 12:00 p.m.

Horner Automation Remote Compact Controller

2022-12-0112:00:00
Industrial Control Systems Cyber Emergency Response Team
www.cisa.gov
14

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

0.002 Low

EPSS

Percentile

53.2%

1. EXECUTIVE SUMMARY

  • CVSS v3 9.8 ***ATTENTION: **Exploitable remotely/low attack complexity
  • Vendor: Horner Automation
  • Equipment: Remote Compact Controller (RCC) 972
  • Vulnerabilities: Inadequate Encryption Strength, Use of Hard-coded Cryptographic Key, Excessive Reliance on Global Variables

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to obtain credentials to the affected device and obtain complete control.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following version of Remote Compact Controller (RCC) 972, an all-in-one I/O controller, is affected:

  • RCC 972: Firmware Version 15.40

3.2 VULNERABILITY OVERVIEW

3.2.1 INADEQUATE ENCRYPTION STRENGTH CWE-326

The Config-files of Horner Automation’s RCC 972 with firmware version 15.40 are encrypted with weak XOR encryption vulnerable to reverse engineering. This could allow an attacker to obtain credentials to run services such as File Transfer Protocol (FTP) and Hypertext Transfer Protocol (HTTP).

CVE-2022-2640 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

3.2.2 USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321

Horner Automation’s RCC 972 with firmware version 15.40 has a static encryption key on the device. This could allow an attacker to perform unauthorized changes to the device, remotely execute arbitrary code, or cause a denial-of-service condition.

CVE-2022-2641 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.2.3 EXCESSIVE RELIANCE ON GLOBAL VARIABLES CWE-1108

Horner Automation’s RCC 972 firmware version 15.40 contains global variables. This could allow an attacker to read out sensitive values and variable keys from the device.

CVE-2022-2642 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

3.3 BACKGROUND

  • **CRITICAL INFRASTRUCTURE SECTORS:**Critical Manufacturing
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

m1etz reported these vulnerabilities through the Computer Emergency Response Team, CERT-Bund, to CISA.

4. MITIGATIONS

Horner Automation recommends that users update RCC 972 to the latest firmware available to mitigate the risk of this vulnerability:

CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:

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

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

CISA also provides a section for control systems security recommended practices on the ICS webpage at cisa.gov/ics. Several CISA products detailing cyber defense best 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 webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

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

No known public exploits specifically target these vulnerabilities.

References

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

0.002 Low

EPSS

Percentile

53.2%

Related for ICSA-22-335-02