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Nodejs js-yaml load() Code Execution

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Nodejs js-yaml load() Code Execution

Disclosed
06/28/2013
Created
05/30/2018

Description

This module can be used to abuse node.js applications that parse user-supplied YAML input using the load() function from the 'js-yaml' package < 2.0.5, which doesn't properly handle the unsafe !!js/function tag, allowing to specify a self-executing function which results on execution of arbitrary javascript code.

Author(s)

  • Neal Poole
  • joev <joev@metasploit.com>

Platform

NodeJS

Architectures

nodejs

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/multi/fileformat/nodejs_js_yaml_load_code_exec
msf exploit(nodejs_js_yaml_load_code_exec) > show targets
    ...targets...
msf exploit(nodejs_js_yaml_load_code_exec) > set TARGET < target-id >
msf exploit(nodejs_js_yaml_load_code_exec) > show options
    ...show and set options...
msf exploit(nodejs_js_yaml_load_code_exec) > 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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