GHSA-h76r-vgf3-j6w5 October CMS auth bypass and account takeover

• Packagist october/system: < 1.0.472 → fixed in 1.0.472 • Packagist october/system: >= 1.1.1, < 1.1.5 → fixed in 1.1.5

Impact An attacker can exploit this vulnerability to bypass authentication using a specially crafted persist cookie. • To exploit this vulnerability, an attacker must obtain a Laravel’s secret key for cookie encryption and signing. • Due to the logic of how this mechanism works, a targeted user account must be logged in while the attacker is exploiting the vulnerability. • Authorization via persist cookie not shown in access logs. Patches • Issue has been patched in Build 472 and v1.1.5 • Shortened patch instructions Workarounds Apply https://github.com/octobercms/library/commit/016a297b1bec55d2e53bc889458ed2cb5c3e9374 and https://github.com/octobercms/library/commit/5bd1a28140b825baebe6becd4f7562299d3de3b9 to your installation manually if you are unable to upgrade. [Update 2022-01-20] Shortened patch instructions can be found here. Recommendations We recommend the following steps to make sure your server stays secure: • Keep server OS and system software up to date. • Keep October CMS software up to date. • Use a multi-factor authentication plugin. • Change the default backend URL or block public access to the backend area. • Include the Roave/SecurityAdvisories Composer package to ensure that your application doesn't have installed dependencies with known security vulnerabilities. References Bugs found as part of Solar Security CMS Research. Credits to: • Andrey Basarygin • Andrey Guzei • Mikhail Khramenkov • Alexander Sidukov • Maxim Teplykh For more information If you have any questions or comments about this advisory: • Email us at [email protected]