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CVE-2020-15867

Status Candidate

Overview

The git hook feature in Gogs 0.5.5 through 0.12.2 allows for authenticated remote code execution. There can be a privilege escalation if access to this hook feature is granted to a user who does not have administrative privileges. NOTE: because this is mentioned in the documentation but not in the UI, it could be considered a "Product UI does not Warn User of Unsafe Actions" issue.

Related Files

Gogs Git Hooks Remote Code Execution
Posted Apr 7, 2021
Authored by Christophe de la Fuente, Podalirius | Site metasploit.com

This Metasploit 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.

tags | exploit, remote, web, code execution
systems | windows
advisories | CVE-2020-15867
MD5 | b94ad9d4b20219eb61069ef797cbb9b2
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