CVE-2019-10909: Escape validation messages in the PHP templating engine

April 17, 2019 • Published by Fabien Potencier

Affected versions

Symfony 2.7.0 to 2.7.50, 2.8.0 to 2.8.49, 3.4.0 to 3.4.25, 4.1.0 to 4.1.11 and 4.2.0 to 4.2.6 versions of Symfony Framework Bundle templating are affected by this security issue.

The issue has been fixed in Symfony 2.7.51, 2.8.50, 3.4.26, 4.1.12 and 4.2.7.

Note that no fixes are provided for Symfony 3.0, 3.1, 3.2, 3.3, and 4.0 as they are not maintained anymore.

Description

Validation messages were not escaped when using the form theme of the PHP templating engine which, when validation messages may contain user input, could result in an XSS.

Resolution

Ensuring validation form messages are wrapped with $view->escape().

The patch for this issue is available here for branch 3.4.

Credits

I would like to thank Christophe Coevoet (stof) for reporting & fixing the issue.

Published in #Security Advisories

Have found a security issue in Symfony? Send the details to security [at] symfony.com and don't disclose it publicly until we can provide a fix for it.

Manage your notification preferences to receive an email as soon as a Symfony security release is published.

Help the Symfony project!

As with any Open-Source project, contributing code or documentation is the most common way to help, but we also have a wide range of sponsoring opportunities.

Comments

Choong Wei Tjeng said on Apr 18, 2019 at 15:44

Thank you for these CVE's.

I was a little bit surpised that the security checker had not triggered in our nightly builds this morning. Apparently the PR for that in FriendsOfPHP/security-advisories is not approved/merged yet. For the customer experience I think it would be good if the security checker is up-to-date when the CVE's are released, since it makes it feel like a more trustworthy tool.

But still, thanks again.

Comments are closed.

To ensure that comments stay relevant, they are closed for old posts.