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LibreNMS Collectd Command Injection

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LibreNMS Collectd Command Injection

Disclosed
07/15/2019
Created
09/06/2019

Description

This module exploits a command injection vulnerability in the Collectd graphing functionality in LibreNMS. The `to` and `from` parameters used to define the range for a graph are sanitized using the `mysqli_escape_real_string()` function, which permits backticks. These parameters are used as part of a shell command that gets executed via the `passthru()` function, which can result in code execution.

Author(s)

  • Eldar Marcussen
  • Shelby Pace

Platform

Unix

Architectures

cmd

Development

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/linux/http/librenms_collectd_cmd_inject
msf exploit(librenms_collectd_cmd_inject) > show targets
    ...targets...
msf exploit(librenms_collectd_cmd_inject) > set TARGET < target-id >
msf exploit(librenms_collectd_cmd_inject) > show options
    ...show and set options...
msf exploit(librenms_collectd_cmd_inject) > exploit

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

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