Omron CJ1M unit v4.0 and prior has improper access controls on the memory region where the UM password is stored. If an adversary issues a PROGRAM AREA WRITE command to a specific memory region, they could overwrite the password. This may lead to disabling UM protections or setting a non-ASCII password (non-keyboard characters) and preventing an engineer from viewing or modifying the user program.

Advisories
Source ID Title
EUVD EUVD EUVD-2023-12816 Omron CJ1M unit v4.0 and prior has improper access controls on the memory region where the UM password is stored. If an adversary issues a PROGRAM AREA WRITE command to a specific memory region, they could overwrite the password. This may lead to disabling UM protections or setting a non-ASCII password (non-keyboard characters) and preventing an engineer from viewing or modifying the user program.
Fixes

Solution

No solution given by the vendor.


Workaround

OMRON has released the following countermeasures for users to implement: * Enable the hardware switch to prohibit writing UM (DIP switch on front panel of the CPU Unit) * Set UM read protection password and “Prohibit from overwriting to a protected program “option. If the countermeasures cannot be applied, OMRON recommends that customers take the following mitigation measures: Security measures to prevent unauthorized access: * If the following products and versions are used, the risk of attacks by an attacker via the network can be reduced by taking the following measures. * Enable the FINS write protection function. * Select the Protect by IP Address * Minimize connection of control systems and equipment to open networks, so that untrusted devices will be unable to access them.   * Implement firewalls (by shutting down unused communications ports, limiting communications hosts, limiting access to FINS port (9600)) and isolate them from the IT network. * Use a virtual private network (VPN) for remote access to control systems and equipment. * Use strong passwords and change them frequently. * Install physical controls so that only authorized personnel can access control systems and equipment. * Scan virus to ensure safety of any USB drives or similar devices before connecting them to systems and devices. * Enforce multifactor authentication to all devices with remote access to control systems and equipment whenever possible. * Anti-virus protection * Protect any PC with access to the control system against malware and ensure installation and maintenance of up-to-date commercial grade anti-virus software protection. * Data input and output protection * Validation processing such as backup and range check to cope with unintentional modification of input/output data to control systems and devices. * Data recovery * Periodical data backup and maintenance to prepare for data loss. For more information, see Omron’s Security Advisory https://www.ia.omron.com/product/vulnerability/OMSR-2023-001_en.pdf .

History

Thu, 16 Jan 2025 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: icscert

Published:

Updated: 2025-01-16T21:42:32.824Z

Reserved: 2023-02-13T15:41:55.590Z

Link: CVE-2023-0811

cve-icon Vulnrichment

Updated: 2024-08-02T05:24:34.505Z

cve-icon NVD

Status : Modified

Published: 2023-03-16T18:15:11.160

Modified: 2024-11-21T07:37:52.850

Link: CVE-2023-0811

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses