SDS-3008 Series Industrial Ethernet Switch: Insufficient Resource Pool
CVE-2022-40224 is a high-severity insufficient resource pool vulnerability in SDS-3008 Series Industrial Ethernet Switch from Moxa, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected SDS-3008 Series Industrial Ethernet Switch versions: 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 64.7% chance of exploitation within 30 days, which is in the top 0.74% of all scored CVEs.
Exploitation in the next 30 days is more likely than not, according to EPSS.
What to do
- Check which version of SDS-3008 Series Industrial Ethernet Switch you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on moxa.com 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 |
|---|---|---|---|
| Moxa | SDS-3008 Series Industrial Ethernet Switch | 2.1 | Not stated |
| Moxa | Sds-3008 Firmware | 2.1 and earlier | Not stated |
| Moxa | Sds-3008-t Firmware | 2.1 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
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 3.0 | 5.3 | Medium | CNA (cisco.com) |
Official description
A denial of service vulnerability exists in the web server functionality of Moxa SDS-3008 Series Industrial Ethernet Switch 2.1. A specially-crafted HTTP message header can lead to denial of service. An attacker can send an HTTP request to trigger this vulnerability.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Insufficient Resource Pool
The product's resource pool is not large enough to handle peak demand.
How developers prevent this class of flaw
- Do not perform resource-intensive transactions for unauthenticated users and/or invalid requests.
- Consider implementing a velocity check mechanism which would detect abusive behavior.
- Consider load balancing as an option to handle heavy loads.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Technical write-ups (may include proof of concept)
- talosintelligence.com/vulnerability_reports/TALOS-2022-1618Exploit, Technical Description, Third Party Advisory
Other references
Other vulnerabilities in SDS-3008 Series Industrial Ethernet Switch
- 7.5 High severity
Recent Insufficient Resource Pool vulnerabilities
- 7.5 High severity
- 7.5 High severity
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