Industrial Control Systems Network Protocol…: Out-of-bounds Read
CVE-2023-7242 is a high-severity out-of-bounds read vulnerability in Industrial Control Systems Network Protocol Parsers (ICSNPP) - Ethercat Plugin for Zeek from CISA, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Industrial Control Systems Network Protocol Parsers (ICSNPP) - Ethercat Plugin for Zeek versions: d78dda6 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.48% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update icsnpp-ethercat to d78dda6 or a later version.
- Read the advisory on cisa.gov 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 |
|---|---|---|---|
| CISA | Industrial Control Systems Network Protocol Parsers (ICSNPP) - Ethercat Plugin for Zeek | d78dda6 and earlier | Not stated |
| Cisa | icsnpp-ethercat | before d78dda6 | d78dda6 |
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
- 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:L/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.2 | High | CNA (hq.dhs.gov) |
| CVSS 3.1 | 8.2 | High | NVD |
Official description
Industrial Control Systems Network Protocol Parsers (ICSNPP) - Ethercat Zeek Plugin versions d78dda6 and prior are vulnerable to out-of-bounds read during the process of analyzing a specific Ethercat packet. This could allow an attacker to crash the Zeek process and leak some information in memory.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
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
- cisa.gov/news-events/ics-advisories/icsa-24-051-02US Government Resource
Other vulnerabilities in Industrial Control Systems Network Protocol Parsers (ICSNPP) - Ethercat Plugin for Zeek
- 9.8 Critical severity
- 9.8 Critical severity
Recent Out-of-bounds Read vulnerabilities
- 7.5 High severity
- 7.8 High severity
- 9.1 Critical severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
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