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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

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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