Linuxfabrik Monitoring Plugins: Arbitrary root file disclosure via unconfined --filename in logfile plugin (sudoers LPE)
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure, Privilege escalation
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-22, CWE-269 and the CVSS impact.
Summary
Linuxfabrik Monitoring Plugins provides monitoring plugins for Icinga, Nagios, and related systems. Prior to version 7.0.0, check-plugins/logfile/logfile accepted a free-form --filename path and opened it as root when invoked through the shipped nagios or icinga sudoers allowlist, without confining the resolved path to /var/log. An attacker who controls the monitoring account can select a root-readable file such as /etc/shadow and use --warning-regex . while leaving SUPPRESS_OUTPUT false, causing each nonempty line to be collected in warn_matches and returned through lib.base.oao(). The vulnerable flow passes the expanded scan_path directly to open(), and neither real-path containment nor an allowlist protects the sink. The same fix also confines mysql-logfile and openvpn-client-list paths, allows only documented log roots, and resolves symlinks and parent-directory traversal before checking containment. This issue is fixed in version 7.0.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linuxfabrik | monitoring-plugins | before 7.0.0 | 7.0.0 | Patch available | CNA |
- monitoring-plugins VendorLinuxfabrik Affected before 7.0.0 Fixed in 7.0.0 Patch available CNA
Remediation
- Fix · CNA monitoring-plugins (Linuxfabrik) Fixed in 7.0.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-73973
References
Other 4
- https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-f54c-p5vg-mr5c
- https://github.com/Linuxfabrik/monitoring-plugins/commit/a0ca1268d84e0caf10442b9c7477d699b52d1c92
- https://github.com/Linuxfabrik/monitoring-plugins/blob/ae486fc629e1ca9373e1b6dd5e395603ee453bbc/CHANGELOG.md#v700---2026-08-14
- https://github.com/Linuxfabrik/monitoring-plugins/releases/tag/v7.0.0
More Linuxfabrik vulnerabilities
- TI-2026-39994 linuxfabrik-lib: Local privilege escalation using embedded command CVSS 3.1HIGH 7.8
- TI-2026-37926 Linuxfabrik Monitoring Plugins Sudoers: /usr/bin/apt-get arguments allow privilege escalation CVSS 4.0HIGH 7.0
- TI-2026-51979 linuxfabrik-lib: Arbitrary root file read via live --test argument (lib.lftest) across sudoers-whitelisted plugins (LPE) CVSS 3.1MEDIUM 5.5
- TI-2026-38766 linuxfabrik-lib: Insecure creation of SQLite databases CVSS 4.0LOW 2.0
- TI-2026-47716 Linuxfabrik monitoring-plugins: SSRF and auth-token disclosure via unvalidated @odata.id link in redfish-* plugins CVSS 4.0HIGH 8.3
- TI-2026-47715 linuxfabrik-lib: fetch() forwards credential headers across a cross-origin redirect CVSS 4.0MEDIUM 6.0
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences