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

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.

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CVE-2019-10909: Escape validation messages in the PHP templating engine symfony.com/blog/cve-2019-10909-escape-validation-messages-in-the-php-templating-engine

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Comments

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.

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