Checkmk: Externally Controlled Reference to a Resource in Another Sphere
CVE-2024-28826 is a high-severity externally controlled reference to a resource in another sphere vulnerability in Checkmk, with a CVSS 3.1 base score of 8.1 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. The record lists versions 2.3.0p4, 2.2.0p27, 2.1.0p44 as the first without the flaw, so updating Checkmk to one of those releases or later removes the exposure. 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 Checkmk to 2.3.0p4 or 2.2.0p27 or 2.1.0p44 or 2.0.0p39, whichever matches your release line, or a later version.
- Read the advisory on checkmk.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Checkmk | Checkmk | 2.3.0 up to, but not including, 2.3.0p4; 2.2.0 up to, but not including, 2.2.0p27; 2.1.0 up to, but not including, 2.1.0p44; 2.0.0 through 2.0.0p39; 2.0.0 up to, but not including, 2.0.0p39 | 2.3.0p4, 2.2.0p27, 2.1.0p44, 2.0.0p39 |
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
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.8 | High | CNA (checkmk.com) |
| CVSS 3.1 | 8.1 | High | NVD |
Official description
Improper restriction of local upload and download paths in check_sftp in Checkmk before 2.3.0p4, 2.2.0p27, 2.1.0p44, and in Checkmk 2.0.0 (EOL) allows attackers with sufficient permissions to configure the check to read and write local files on the Checkmk site server.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Externally Controlled Reference to a Resource in Another Sphere
The product uses an externally controlled name or reference that resolves to a resource that is outside of the intended control sphere.
More Externally Controlled Reference to a Resource in Another Sphere vulnerabilities (CWE-610)
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
Advisories
Other vulnerabilities in Checkmk
- 9.4 Critical severity
- 9.4 Critical severity
- 9.4 Critical severity
- 7.1 High severity
- 8.6 High severity
- 7.8 High severity
Recent Externally Controlled Reference to a Resource in Another Sphere vulnerabilities
- 9.1 Critical severity
- 7.8 High severity
- 9.8 Critical severity
- 7.5 High severity
- 7.3 High severity
- 9.8 Critical severity
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