CVE-2022-29958
The logic that is downloaded to the PLC is not cryptographically authenticated, allowing an attacker to execute arbitrary machine code on the PLC's CPU module in the context of the runtime.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.56%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
JTEKT TOYOPUC PLCs through 2022-04-29 do not ensure data integrity. They utilize the unauthenticated CMPLink/TCP protocol for engineering purposes, including downloading projects and control logic to the PLC. Control logic is downloaded to the PLC on a block-by-block basis with a given memory address and a blob of machine code. The logic that is downloaded to the PLC is not cryptographically authenticated, allowing an attacker to execute arbitrary machine code on the PLC's CPU module in the context of the runtime. In the case of the PC10G-CPU, and likely for other CPU modules of the TOYOPUC family, a processor without MPU or MMU is used and this no memory protection or privilege-separation capabilities are available, giving an attacker full control over the CPU.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.56% probability · 45th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-345
- Affected
- jtekt/pc10g-cpu tcc-6353 firmware · jtekt/pc10ge tcc-6464 firmware · jtekt/pc10p tcc-6372 firmware · jtekt/pc10p-dp tcc-6726 firmware · jtekt/pc10p-dp-io tcc-6752 firmware · jtekt/pc10b-p tcc-6373 firmware · jtekt/pc10b tcc-1021 firmware · jtekt/pc10e tcc-4737 firmware · jtekt/pc10el tcc-4747 firmware · jtekt/plus cpu tcc-6740 firmware · jtekt/pc3jx tcc-6901 firmware · jtekt/pc3jx-d tcc-6902 firmware · jtekt/pc10pe tcc-1101 firmware · jtekt/pc10pe-1616p tcc-1102 firmware · jtekt/pcdl tkc-6688 firmware · jtekt/nano 10gx tuc-1157 firmware · jtekt/nano cpu tuc-6941 firmware
- Source
- cve@mitre.org
References
- https://www.cisa.gov/uscert/ics/advisories/icsa-22-172-02Third Party Advisory, US Government Resource
- https://www.forescout.com/blog/Third Party Advisory
- https://www.cisa.gov/uscert/ics/advisories/icsa-22-172-02Third Party Advisory, US Government Resource
- https://www.forescout.com/blog/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.