Description
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.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Metasploit 1 module
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LibreNMS addhost Command Injection
exploit/linux/http/librenms_addhost_cmd_inject
Exploit-DB 2
- LibreNMS 1.46 - 'addhost' Remote Code Execution EDB-47044 · webapps · Jun 28, 2019 · verified
- LibreNMS - addhost Command Injection (Metasploit) EDB-46970 · remote · Jun 5, 2019 · verified
GitHub 1 repository
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mhaskar/CVE-2018-20434 ★ 9 · Apr 25, 2019
The official exploit code for LibreNMS v1.46 Remote Code Execution CVE-2018-20434
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | librenms/librenms | 1.46 | — | GHSA-62q7-qj6g-gvr7 |
References
- https://gist.github.com/mhaskar/516df57aafd8c6e3a1d70765075d372d
- https://drive.google.com/file/d/1LcGmOY8x-TG-wnNr-cM_f854kxk0etva/view?usp=sharing
- https://shells.systems/librenms-v1-46-remote-code-execution-cve-2018-20434/
- http://packetstormsecurity.com/files/153188/LibreNMS-addhost-Command-Injection.html
- http://packetstormsecurity.com/files/153448/LibreNMS-1.46-addhost-Remote-Code-Execution.html