SkyBridge MB-A200 and SkyBridge BASIC MB-A130: Missing Authentication for Critical Functionality
CVE-2023-22441 is a high-severity missing authentication for critical functionality vulnerability in SkyBridge MB-A200 and SkyBridge BASIC MB-A130 from Seiko Solutions, with a CVSS 3.1 base score of 8.6 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 0.98% chance of exploitation within 30 days, higher than 63% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of SkyBridge MB-A200 and SkyBridge BASIC MB-A130 you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on seiko-sol.co.jp for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Seiko Solutions | SkyBridge MB-A200 and SkyBridge BASIC MB-A130 | Not specified in the record | Not stated |
| Seiko-sol | Skybridge Basic Mb-a130 Firmware | 1.4.1 and earlier | Not stated |
| Seiko-sol | Skybridge Mb-a200 Firmware | 01.00.05 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
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- LowSome restricted data can be read.
- Integrity
- LowLimited modification of data is possible.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.6 | High | NVD |
| CVSS 3.1 | 8.6 | High | CISA (ADP) |
Official description
Missing authentication for critical function exists in Seiko Solutions SkyBridge series, which may allow a remote attacker to obtain or alter the setting information of the product or execute some critical functions without authentication, e.g., rebooting the product. Affected products and versions are as follows: SkyBridge MB-A200 firmware Ver. 01.00.05 and earlier, and SkyBridge BASIC MB-A130 firmware Ver. 1.4.1 and earlier
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: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Third-party and government advisories
- jvn.jp/en/jp/JVN40604023/Third Party Advisory
Other references
Recent Missing Authentication for Critical Functionality vulnerabilities
- 7.5 High severity
- 9.8 Critical severity
- 9.1 Critical severity
- 9.8 Critical severity
- 7.5 High severity
- 9.8 Critical severity
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