Jenkins SSH2 Easy Plugin: Improper Preservation of Permissions
CVE-2023-41939 is a high-severity improper preservation of permissions vulnerability in Jenkins SSH2 Easy Plugin from Jenkins, 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 Jenkins SSH2 Easy Plugin versions: 1.4 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 0.66% 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 Jenkins SSH2 Easy Plugin you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on jenkins.io for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Jenkins Project | Jenkins SSH2 Easy Plugin | 1.4 and earlier | Not stated |
| Jenkins | Ssh2 Easy | 1.4 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 | 8.8 | High | NVD |
| CVSS 3.1 | 8.8 | High | CISA (ADP) |
Official description
Jenkins SSH2 Easy Plugin 1.4 and earlier does not verify that permissions configured to be granted are enabled, potentially allowing users formerly granted (typically optional permissions, like Overall/Manage) to access functionality they're no longer entitled to.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Preservation of Permissions
The product does not preserve permissions or incorrectly preserves permissions when copying, restoring, or sharing objects, which can cause them to have less restrictive permissions than intended.
More Improper Preservation of Permissions vulnerabilities (CWE-281)
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
Third-party and government advisories
- openwall.com/lists/oss-security/2023/09/06/9Mailing List, Third Party Advisory
Recent Improper Preservation of Permissions vulnerabilities
- 7.8 High severity
- 9.8 Critical severity
- 7.2 High severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
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