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Gogs Git Hooks Remote Code Execution

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Gogs Git Hooks Remote Code Execution

Disclosed
10/07/2020
Created
04/08/2021

Description

This module leverages an insecure setting to get remote code execution on the target OS in the context of the user running Gogs. This is possible when the current user is allowed to create `git hooks`, which is the default for administrative users. For non-administrative users, the permission needs to be specifically granted by an administrator. To achieve code execution, the module authenticates to the Gogs web interface, creates a temporary repository, sets a `post-receive` git hook with the payload and creates a dummy file in the repository. This last action will trigger the git hook and execute the payload. Everything is done through the web interface. No mitigation has been implemented so far (latest stable version is 0.12.3). This module has been tested successfully against version 0.12.3 on docker. Windows version could not be tested since the git hook feature seems to be broken.

Author(s)

  • Podalirius
  • Christophe De La Fuente

Platform

Linux,Unix,Windows

Architectures

cmd, 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/multi/http/gogs_git_hooks_rce
msf exploit(gogs_git_hooks_rce) > show targets
    ...targets...
msf exploit(gogs_git_hooks_rce) > set TARGET < target-id >
msf exploit(gogs_git_hooks_rce) > show options
    ...show and set options...
msf exploit(gogs_git_hooks_rce) > exploit

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