Omron CJ1M unit v4.0 and prior has improper access controls on the memory region where the UM password is stored.

Summary

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.

Timeline

1. Mar 16, 2023, 5:41 PM UTCCVE published
2. Jan 16, 2025, 8:56 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Jan 16, 2025, 9:42 PM UTCRecord last updated

Affected versions

• CJ2H-CPU6 □ -EIP

  All versions

• CJ2H-CPU6 □

  All versions

• CJ2M-CPU □ □

  All versions

• CJ1G-CPU □ □ P

  All versions

• CS1H-CPU □ □ H

  All versions

• CS1G-CPU □ □ H

  All versions

• CS1D-CPU □ □ HA

  All versions

• CS1D-CPU □ □ H

  All versions

• CS1D-CPU □ □ SA

  All versions

• CS1D-CPU □ □ S

  All versions

• CS1D-CPU □ □ P

  All versions

• CP2E-E □ □ D □ - □

  All versions

• CP2E-S □ □ D □- □

  All versions

• CP2E-N □ □ D □ - □

  All versions

• CP1H-X40D □ - □

  All versions

• CP1H-XA40D □ - □

  All versions

• CP1H-Y20DT-D

  All versions

• CP1L-EL20D □ - □

  All versions

• CP1L-EM □ □ D □ - □

  All versions

• CP1L-L □ □ D □- □

  All versions

• CP1L-M □ □ D □ - □

  All versions

• CP1E-E □ □ D □ - □

  All versions

• CP1E-NA □ □ D □ - □

  All versions

References 2