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CVE-2018-19790: Open Redirect Vulnerability when using Security\Http

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Affected versions

Symfony 2.7.0 to 2.7.49, 2.8.0 to 2.8.48, 3.0.0 to 3.4.19, 4.0.0 to 4.0.14, 4.1.0 to 4.1.8 and 4.2.0 versions of the Symfony Form component are affected by this security issue.

The issue has been fixed in Symfony 2.7.50, 2.8.49, 3.4.20, 4.0.15, 4.1.9 and 4.2.1.

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

Description

Using backslashes in the _failure_path input field of login forms, one can work around the redirection target restrictions and effectively redirect the user to any domain after login.

Resolution

The regular expression filtering redirection targets has been updated to account for a mix of forward and backward slashes.

The patch for this issue is available here for branch 2.7.

Credits

I would like to thank the EC-CUBE Dev Team for reporting the issue and Christian Flothmann for fixing it.


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