7.5
CVSSv2

CVE-2021-21425

Published: 07/04/2021 Updated: 24/10/2022
CVSS v2 Base Score: 7.5 | Impact Score: 6.4 | Exploitability Score: 10
CVSS v3 Base Score: 9.8 | Impact Score: 5.9 | Exploitability Score: 3.9
VMScore: 668
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Summary

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 previous versions, 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.

Vulnerability Trend

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getgrav grav-plugin-admin

Github Repositories

It is a nmap script for GravCMS vulnerability (CVE-2021-21425)

GravCMS_Nmap_Script It is a nmap script for GravCMS vulnerability (CVE-2021-21425) USAGE -- nmap -p443 --script grav_cmsnse -- PORT STATE SERVICE -- 443/tcp open https -- | grav_cms: -- | VULNERABLE: -- | GravCMS (CVE-2021-21425) -- | State: VULNERABLE (Exploitable) -- | IDs: CVE:CVE-2021-21425 -- | GravCMS Unauthenticated Arbitrary YAML Write/Update le

GravCMS Unauthenticated Arbitrary YAML Write/Update leads to Code Execution (CVE-2021-21425)

CVE-2021-21425 GravCMS Unauthenticated Arbitrary YAML Write/Update leads to Code Execution (CVE-2021-21425) Reference : pentestblog/unexpected-journey-7-gravcms-unauthenticated-arbitrary-yaml-write-update-leads-to-code-execution/