CVE-2017-16652: Open redirect vulnerability on security handlers

Affected versions

Symfony 2.7.0 to 2.7.37, 2.8.0 to 2.8.30, 3.2.0 to 3.2.13, and 3.3.0 to 3.3.12 versions of the Symfony Security component are affected by this security issue.

The issue has been fixed in Symfony 2.7.38, 2.8.31, 3.2.14, 3.3.13, 3.4-BETA5, and 4.0-BETA5.

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


DefaultAuthenticationSuccessHandler or DefaultAuthenticationFailureHandler take
the content of the _target_path parameter and generate a redirect response but no
check is performed on the path, which could be an absolute URL to an external domain,
opening redirect vulnerability.

Open redirect vulnerability are not too much considered but they can be exploited for
example to mount effective phishing attacks.


The fix forces the redirect target to be within the scope of the session cookie.
The allowed redirect targets must now match the cookie_domain and cookie_secure
configuration options.

The patch for this issue is available

[risorsa: Symfony Blog ]