PT-2021-12: Authentication pypass by capture-replay in FX5U© CPU and FX5UJ CPU modules

FX5U© CPU and FX5UJ CPU modules

Severity level

Severity level: Medium
Impact: Authentication pypass by capture-replay in FX5U© CPU and FX5UJ CPU modules
Access Vector: Remote

CVSS v3.0
Base Score: 5,9
Vector: (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)

CVE-2022-25159

Vulnerability description:

The vulnerability of the FX5U© CPU and FX5UJ CPU modules of Mitsubishi Electric FA products is associated with the possibility of bypass authorization using capture-replay of intercepted parameters. Exploitation of the vulnerability may allow an attacker who has intercepted the parameters of the security key mechanism transmitted in the MELSOFT protocol in open form to authorize the PLC firmware.

Advisory status

15.12.2021 - Vendor gets vulnerability details
31.03.2022 - Security advisory publication date (https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-031_en.pdf )

Credits

The vulnerability was detected by Anton Dorfman (Positive Technologies)