CVE-2021-41268 Cookie persistence in Symfony

What is CVE-2021-41268?

CVE-2021-41268 is a medium-severity vulnerability in Sensiolabs Symfony, published on 24 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Symfony/SecurityBundle is the security system for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Since the rework of the Remember me cookie in version 5.3.0, the cookie is not invalidated when the user changes their password. Attackers can therefore maintain their access to the account even if the password is changed as long as they have had the chance to login once and get a valid remember me cookie. Starting with version 5.3.12, Symfony makes the password part of the signature by default. In that way, when the password changes, then the cookie is not valid anymore.

Weakness: CWE-384

Which versions are affected by CVE-2021-41268?

5 open source packages ship an affected version, including symfony/security-bundle, symfony and symfony/symfony. It affects 1 product.

Products include Sensiolabs Symfony.

How do I fix CVE-2021-41268?

Upgrade symfony/security-bundle to 5.3.12 or later.

Is CVE-2021-41268 being exploited?

There is no known exploitation of CVE-2021-41268 in the wild and no public exploit code.

Other vulnerabilities in Sensiolabs Symfony

• CVE-2019-11325 Improper Input Validation in Symfony Critical 9.8
• CVE-2017-11365 Symfony Incorrect Access Control Critical 9.8
• CVE-2019-10913 Invalid HTTP method overrides allow possible XSS or other attacks in Symfony Critical 9.8
• CVE-2018-11407 Symfony Authentication Bypass Critical 9.8
• CVE-2016-2403 Symfony Authentication Bypass Critical 9.8

All Sensiolabs Symfony vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-symfony-2021-41268, GHSA-qw36-p97w-vcqr.