Nova 220 (EYK220F001) DDC with BACnet connection: Missing Authentication for Critical Functionality
CVE-2023-0052 is a high-severity missing authentication for critical functionality vulnerability in Nova 220 (EYK220F001) DDC with BACnet connection from Sauter-controls, 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 Nova 220 (EYK220F001) DDC with BACnet connection versions: Firmware all versions through 3.3-006; BACnetstac all versions through 4.2.1. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.74% chance of exploitation within 30 days, higher than 55% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Nova 220 (EYK220F001) DDC with BACnet connection you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| SAUTER Controls | Nova 220 (EYK220F001) DDC with BACnet connection | Firmware all versions through 3.3-006; BACnetstac all versions through 4.2.1 | Not stated |
| SAUTER Controls | Nova 230 (EYK230F001) DDC with BACnet connection | Firmware all versions through 3.3-006; BACnetstac all versions through 4.2.1 | Not stated |
| SAUTER Controls | Nova 106 (EYK300F001) BACnet communication card | Firmware all versions through 3.3-006; BACnetstac all versions through 4.2.1 | Not stated |
| SAUTER Controls | moduNet300 (EY-AM300F001, EY-AM300F002) | Firmware all versions through 3.3-006; BACnetstac all versions through 4.2.1 | Not stated |
| Sauter-controls | Nova 220 Eyk220f001 Firmware | 3.3-006 and earlier | Not stated |
| Sauter-controls | Nova 230 Eyk230f001 Firmware | 3.3-006 and earlier | Not stated |
| Sauter-controls | Nova 106 Eyk300f001 Firmware | 3.3-006 and earlier | Not stated |
| Sauter-controls | Modunet300 Ey-am300f001 Firmware | 3.3-006 and earlier | Not stated |
| Sauter-controls | Modunet300 Ey-am300f002 Firmware | 3.3-006 and earlier | Not stated |
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 | 9.8 | Critical | CNA (hq.dhs.gov) |
| CVSS 3.1 | 8.8 | High | NVD |
Official description
SAUTER Controls Nova 200–220 Series with firmware version 3.3-006 and prior and BACnetstac version 4.2.1 and prior allows the execution of commands without credentials. As Telnet and file transfer protocol (FTP) are the only protocols available for device management, an unauthorized user could access the system and modify the device configuration, which could result in the unauthorized user executing unrestricted malicious commands.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Missing Authentication for Critical Functionality
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
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. For example, consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator.
- When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to require strong authentication for users who should be allowed to access the data.
More Missing Authentication for Critical Functionality vulnerabilities (CWE-306)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- cisa.gov/uscert/ics/advisories/icsa-23-012-05Third Party Advisory, US Government Resource
Other vulnerabilities in Nova 220 (EYK220F001) DDC with BACnet connection
- 7.5 High severity
Recent Missing Authentication for Critical Functionality vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 9.8 Critical severity
- 8.2 High severity
- 8.2 High severity
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