CENTUM CS 3000: Improper Limitation of a Pathname to a Restricted Directory
CVE-2022-21808 is a high-severity improper limitation of a pathname to a restricted directory vulnerability in CENTUM CS 3000 from Yokogawa Electric, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected CENTUM CS 3000 versions: versions from R3.08.10 to R3.09.00. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 1.06% chance of exploitation within 30 days, higher than 65% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Centum Vp Firmware to r6.09.00 or a later version.
- Update Centum Vp Entry Firmware to r6.09.00 or a later version.
- Read the advisory on web-material3.yokogawa.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Yokogawa Electric | CENTUM CS 3000 | versions from R3.08.10 to R3.09.00 | Not stated |
| Yokogawa Electric | CENTUM VP | versions from R4.01.00 to R4.03.00; versions from R5.01.00 to R5.04.20; versions from R6.01.00 to R6.08.00 | Not stated |
| Yokogawa Electric | Exaopc | versions from R3.72.00 to R3.79.00 | Not stated |
| Yokogawa | Centum Cs 3000 Firmware | r3.08.10 through r3.09.00 | Not stated |
| Yokogawa | Centum Cs 3000 Entry Firmware | r3.08.10 through r3.09.00 | Not stated |
| Yokogawa | Centum Vp Firmware | r4.01.00 through r4.03.00; r5.01.00 through r5.04.20; r6.01.00 up to, but not including, r6.09.00 | r6.09.00 |
| Yokogawa | Centum Vp Entry Firmware | r4.01.00 through r4.03.00; r5.01.00 through r5.04.20; r6.01.00 up to, but not including, r6.09.00 | r6.09.00 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.8 | High | NVD |
| CVSS 2.0 | 6.0 | Medium | NVD |
Official description
Path traversal vulnerability exists in CAMS for HIS Server contained in the following Yokogawa Electric products: CENTUM CS 3000 versions from R3.08.10 to R3.09.00, CENTUM VP versions from R4.01.00 to R4.03.00, from R5.01.00 to R5.04.20, and from R6.01.00 to R6.08.00, Exaopc versions from R3.72.00 to R3.79.00.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Limitation of a Pathname to a Restricted Directory
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
How developers prevent this class of flaw
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth.
More Improper Limitation of a Pathname to a Restricted Directory vulnerabilities (CWE-22)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in CENTUM CS 3000
- 8.5 High severity
- 7.8 High severity
- 8.8 High severity
- 8.1 High severity
- 7.8 High severity
- 8.1 High severity
Recent Improper Limitation of a Pathname to a Restricted Directory vulnerabilities
- 7.5 High severity
- 8.1 High severity
- 7.5 High severity
- 8.8 High severity
- 8.1 High severity
- 7.5 High severity
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