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elFinder Archive Command Injection

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elFinder Archive Command Injection

Disclosed
06/13/2021
Created
09/20/2021

Description

elFinder versions below 2.1.59 are vulnerable to a command injection vulnerability via its archive functionality. When creating a new zip archive, the `name` parameter is sanitized with the `escapeshellarg()` php function and then passed to the `zip` utility. Despite the sanitization, supplying the `-TmTT` argument as part of the `name` parameter is still permitted and enables the execution of arbitrary commands as the `www-data` user.

Author(s)

  • Thomas Chauchefoin
  • Shelby Pace

Platform

Linux

Architectures

x86, x64

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