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.
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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 .
Tracking
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| Source | ID | Title |
|---|---|---|
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. |
Thu, 16 Jan 2025 22:15:00 +0000
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Subscriptions
Status: PUBLISHED
Assigner: icscert
Published:
Updated: 2025-01-16T21:42:32.824Z
Reserved: 2023-02-13T15:41:55.590Z
Link: CVE-2023-0811
Updated: 2024-08-02T05:24:34.505Z
Status : Modified
Published: 2023-03-16T18:15:11.160
Modified: 2024-11-21T07:37:52.850
Link: CVE-2023-0811
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OpenCVE Enrichment
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EUVD