CVE-2020-5217

In Secure Headers (RubyGem secure_headers), a directive injection
vulnerability is present in versions before 3.8.0, 5.1.0, and 6.2.0. If
user-supplied input was passed into
append/override_content_security_policy_directives, a semicolon could be
injected leading to directive injection. This could be used to e.g.
override a script-src directive. Duplicate directives are ignored and the
first one wins. The directives in secure_headers are sorted alphabetically
so they pretty much all come before script-src. A previously undefined
directive would receive a value even if SecureHeaders::OPT_OUT was
supplied. The fixed versions will silently convert the semicolons to spaces
and emit a deprecation warning when this happens. This will result in
innocuous browser console messages if being exploited/accidentally used. In
future releases, we will raise application errors resulting in 500s.
Depending on what major version you are using, the fixed versions are
6.2.0, 5.1.0, 3.8.0.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=949999&gt;