CENTUM series provided by Yokogawa Electric Corporation are vulnerable to cleartext storage of sensitive information. If an attacker who can login or access the computer where the affected product is installed tampers the password file stored in the computer, the user privilege which CENTUM managed may be escalated. As a result, the control system may be operated with the escalated user privilege. To exploit this vulnerability, the following prerequisites must be met: (1)An attacker has obtained user credentials where the affected product is installed, (2)CENTUM Authentication Mode is used for user authentication when CENTUM VP is used. The affected products and versions are as follows: CENTUM CS 1000, CENTUM CS 3000 (Including CENTUM CS 3000 Entry Class) R2.01.00 to R3.09.50, CENTUM VP (Including CENTUM VP Entry Class) R4.01.00 to R4.03.00, R5.01.00 to R5.04.20, and R6.01.00 and later, B/M9000 CS R5.04.01 to R5.05.01, and B/M9000 VP R6.01.01 to R7.04.51 and R8.01.01 and later
The product stores sensitive information in cleartext within a resource that might be accessible to another control sphere.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| B/m9000_vp | Yokogawa | r6.01.01 (including) | r7.04.51 (including) |
| B/m9000_vp | Yokogawa | r8.01.01 (including) | * |
| B/m9000cs | Yokogawa | r5.04.01 (including) | r5.05.01 (including) |
| Centum_cs_1000 | Yokogawa | r2.01.00 (including) | r3.09.50 (including) |
| Centum_cs_3000 | Yokogawa | r2.01.00 (including) | r3.09.50 (including) |
| Centum_cs_3000_entry_class | Yokogawa | r2.01.00 (including) | r3.09.50 (including) |
| Centum_vp | Yokogawa | r4.01.00 (including) | r4.03.00 (including) |
| Centum_vp | Yokogawa | r5.01.00 (including) | r5.04.20 (including) |
| Centum_vp | Yokogawa | r6.01.00 (including) | * |
| Centum_vp_entry_class | Yokogawa | r4.01.00 (including) | r4.02.00 (including) |
| Centum_vp_entry_class | Yokogawa | r5.01.00 (including) | r5.04.20 (including) |
| Centum_vp_entry_class | Yokogawa | r6.01.00 (including) | * |
| Exaopc | Yokogawa | r1.01.00 (including) | r1.20.00 (including) |
| Exaopc | Yokogawa | r2.01.00 (including) | r2.10.00 (including) |
| Exaopc | Yokogawa | r3.01.00 (including) | * |
Because the information is stored in cleartext (i.e., unencrypted), attackers could potentially read it. Even if the information is encoded in a way that is not human-readable, certain techniques could determine which encoding is being used, then decode the information. When organizations adopt cloud services, it can be easier for attackers to access the data from anywhere on the Internet. In some systems/environments such as cloud, the use of “double encryption” (at both the software and hardware layer) might be required, and the developer might be solely responsible for both layers, instead of shared responsibility with the administrator of the broader system/environment.