CVE-2020-5274 Exceptions displayed in non-debug configurations in Symfony

What is CVE-2020-5274?

CVE-2020-5274 is a medium-severity vulnerability in Sensiolabs Symfony, published on 30 Mar 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

In Symfony before versions 5.0.5 and 4.4.5, some properties of the Exception were not properly escaped when the `ErrorHandler` rendered it stacktrace. In addition, the stacktrace were displayed even in a non-debug configuration. The ErrorHandler now escape alls properties of the exception, and the stacktrace is only display in debug configuration. This issue is patched in symfony/http-foundation versions 4.4.5 and 5.0.5

Weakness: CWE-209

Which versions are affected by CVE-2020-5274?

9 open source packages ship an affected version, including symfony/error-handler, symfony and symfony/symfony. It affects 1 product.

Products include Sensiolabs Symfony.

How do I fix CVE-2020-5274?

Upgrade symfony/error-handler to a fixed version for your release line: 4.4.4 or 5.0.4.

Is CVE-2020-5274 being exploited?

There is no known exploitation of CVE-2020-5274 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-2020-5274, DEBIAN-CVE-2020-5274, GHSA-m884-279h-32v2.