CVE-2018-20434 — LibreNMS 1
LibreNMS 1.46 allows remote attackers to execute arbitrary OS commands by using the $_POST['community'] parameter to html/pages/addhost.inc.php during creation of a new device, and then making a /ajax_output.php?id=capture&format=text&type=snmpwalk&hostname=
Published
2019-04-24T20:05:43.000Z
Last modified
2024-08-05T11:58:19.369Z
01What is this vulnerability?
LibreNMS 1.46 allows remote attackers to execute arbitrary OS commands by using the $_POST['community'] parameter to html/pages/addhost.inc.php during creation of a new device, and then making a /ajax_output.php?id=capture&format=text&type=snmpwalk&hostname=localhost request that triggers html/includes/output/capture.inc.php command mishandling.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / n/a | n/a |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2019-04-24T20:05:43.000Z
- Last modified: 2024-08-05T11:58:19.369Z
09References
- gist.github.com — https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372d
- drive.google.com — https://drive.google.com/file/d/1LcGmOY8x-TG-wnNr-cM_f854kxk0etva/view?usp=shari…
- shells.systems — https://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/
- packetstormsecurity.com — http://packetstormsecurity.com/files/153188/LibreNMS-addhost-Command-Injection.h…
- packetstormsecurity.com — http://packetstormsecurity.com/files/153448/LibreNMS-1.46-addhost-Remote-Code-Ex…
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