MSE6-C2M-5000-FB36-D-M-RG-BAR-M12L4-AGD: Inclusion of Undocumented Features or Chicken Bits
CVE-2023-3634 is a high-severity inclusion of undocumented features or chicken bits vulnerability in MSE6-C2M-5000-FB36-D-M-RG-BAR-M12L4-AGD from Festo, 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. There is no confirmed exploitation so far. EPSS estimates a 0.67% chance of exploitation within 30 days, higher than 52% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of MSE6-C2M-5000-FB36-D-M-RG-BAR-M12L4-AGD you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Festo | MSE6-C2M-5000-FB36-D-M-RG-BAR-M12L4-AGD | Not specified in the record | Not stated |
| Festo | MSE6-C2M-5000-FB36-D-M-RG-BAR-M12L5-AGD | Not specified in the record | Not stated |
| Festo | MSE6-C2M-5000-FB43-D-M-RG-BAR-M12L4-MQ1-AGD | Not specified in the record | Not stated |
| Festo | MSE6-C2M-5000-FB43-D-M-RG-BAR-M12L5-MQ1-AGD | Not specified in the record | Not stated |
| Festo | MSE6-C2M-5000-FB44-D-M-RG-BAR-AMI-AGD | Not specified in the record | Not stated |
| Festo | MSE6-C2M-5000-FB44-D-RG-BAR-AMI-AGD | Not specified in the record | Not stated |
| Festo | MSE6-D2M-5000-CBUS-S-RG-BAR-VCB-AGD | Not specified in the record | Not stated |
| Festo | MSE6-E2M-5000-FB13-AGD | Not specified in the record | Not stated |
| Festo | MSE6-E2M-5000-FB36-AGD | Not specified in the record | Not stated |
| Festo | MSE6-E2M-5000-FB37-AGD | Not specified in the record | Not stated |
| Festo | MSE6-E2M-5000-FB43-AGD | Not specified in the record | Not stated |
| Festo | MSE6-E2M-5000-FB44-AGD | Not specified in the record | 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 CNA (cert.vde.com).
Official description
In products of the MSE6 product-family by Festo a remote authenticated, low privileged attacker could use functions of undocumented test mode which could lead to a complete loss of confidentiality, integrity and availability.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Inclusion of Undocumented Features or Chicken Bits
The device includes chicken bits or undocumented features that can create entry points for unauthorized actors.
How developers prevent this class of flaw
- The implementation of chicken bits in a released product is highly discouraged. If implemented at all, ensure that they are disabled in production devices. All interfaces to a device should be documented.
More Inclusion of Undocumented Features or Chicken Bits vulnerabilities (CWE-1242)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other references
Recent Inclusion of Undocumented Features or Chicken Bits vulnerabilities
- 8.1 High severity
- 9.8 Critical severity
- 7.5 High severity
- 7.2 High severity
- 7.5 High severity
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