CVE-2023-38744 Denial of service in CJ2H CPU Unit
Remote unauthenticated attackers can cause denial of service in OMRON CJ/CS series PLCs by sending specially crafted packets to the EtherNet/IP port.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-38744?
CVE-2023-38744 is a high-severity denial of service vulnerability in OMRON Corporation CJ2H CPU Unit, published on 3 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Denial-of-service (DoS) vulnerability due to improper validation of specified type of input issue exists in the built-in EtherNet/IP port of the CJ Series CJ2 CPU unit and the communication function of the CS/CJ Series EtherNet/IP unit. If an affected product receives a packet which is specially crafted by a remote unauthenticated attacker, the unit of the affected product may fall into a denial-of-service (DoS) condition. Affected products/versions are as follows: CJ2M CPU Unit CJ2M-CPU3[] Unit version of the built-in EtherNet/IP section Ver. 2.18 and earlier, CJ2H CPU Unit CJ2H-CPU6[]-EIP Unit version of the built-in EtherNet/IP section Ver. 3.04 and earlier, CS/CJ Series EtherNet/IP Unit CS1W-EIP21 V3.04 and earlier, and CS/CJ Series EtherNet/IP Unit CJ1W-EIP21 V3.04 and earlier.
Weakness: CWE-1284
Which versions are affected by CVE-2023-38744?
It affects 12 products.
Products include Omron Cj1w-Eip21 Firmware, Omron Cj2h-Cpu64-Eip Firmware, Omron Cj2h-Cpu65-Eip Firmware, Omron Cj2h-Cpu66-Eip Firmware, Omron Cj2h-Cpu67-Eip Firmware, Omron Cj2h-Cpu68-Eip Firmware and 6 more.
How do I fix CVE-2023-38744?
No fix has been published for CVE-2023-38744 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-38744 being exploited?
There is no known exploitation of CVE-2023-38744 in the wild and no public exploit code.
Sources
Also known as GHSA-8262-vqgw-h22m.