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CVE-2021-21425

Status Candidate

Overview

Grav Admin Plugin is an HTML user interface that provides a way to configure Grav and create and modify pages. In versions 1.10.7 and earlier, an unauthenticated user can execute some methods of administrator controller without needing any credentials. Particular method execution will result in arbitrary YAML file creation or content change of existing YAML files on the system. Successfully exploitation of that vulnerability results in configuration changes, such as general site information change, custom scheduler job definition, etc. Due to the nature of the vulnerability, an adversary can change some part of the webpage, or hijack an administrator account, or execute operating system command under the context of the web-server user. This vulnerability is fixed in version 1.10.8. Blocking access to the `/admin` path from untrusted sources can be applied as a workaround.

Related Files

GravCMS 1.10.7 Remote Command Execution
Posted May 4, 2021
Authored by Mehmet Ince | Site metasploit.com

This Metasploit module exploits an arbitrary config write/update vulnerability to achieve remote code execution. Unauthenticated users can execute a terminal command under the context of the web server user. Grav Admin Plugin is an HTML user interface that provides a way to configure Grav and create and modify pages. In versions 1.10.7 and earlier, an unauthenticated user can execute some methods of the administrator controller without needing any credentials. Particular method execution will result in arbitrary YAML file creation or content change of existing YAML files on the system. Successfully exploitation of that vulnerability results in configuration changes, such as general site information change, custom scheduler job definition, etc. Due to the nature of the vulnerability, an adversary can change some part of the webpage, or hijack an administrator account, or execute operating system commands under the context of the web-server user.

tags | exploit, remote, web, arbitrary, code execution
advisories | CVE-2021-21425
SHA-256 | 98b7fd4e5a9eac0e57bc304d77db3533d90d58846a9eac785a65d9954b59c324
GravCMS 1.10.7 Remote Command Execution
Posted Apr 21, 2021
Authored by Mehmet Ince | Site metasploit.com

This Metasploit module exploits an arbitrary configuration write/update vulnerability to achieve remote code execution. Unauthenticated users can execute a terminal command under the context of the web server user. Grav Admin Plugin is an HTML user interface that provides a way to configure Grav and create and modify pages. In versions 1.10.7 and earlier, an unauthenticated user can execute some methods of administrator controller without needing any credentials. Particular method execution will result in arbitrary YAML file creation or content change of existing YAML files on the system. Successfully exploitation of that vulnerability results in configuration changes, such as general site information change, custom scheduler job definition, etc. Due to the nature of the vulnerability, an adversary can change some part of the webpage, or hijack an administrator account, or execute operating system command under the context of the web-server user.

tags | exploit, remote, web, arbitrary, code execution
advisories | CVE-2021-21425
SHA-256 | abded99044d29ee61fd87425114e92d627cb24bfd4a08cbdc45f77650c84534d
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