Ruby on Rails Static Analysis Security Tool

Brakeman 3.3.4/3.3.5 Released

This is a quick release to add warnings for CVE-2016-6316 and CVE-2016-6317. There was a bug in 3.3.4 that affected debug output which has been fixed in 3.3.5.

Changes since 3.3.3:

  • Add generic warning for CVE-2016-6316
  • Warn about dangerous use of content_tag with CVE-2016-6316
  • Add warning for CVE-2016-6317
  • Use Minitest

Changes since 3.3.4:

  • Fix bug in reports when using --debug


Typically Rails will escape attribute values passed to tag helpers like content_tag. If the attribute has already been marked as “safe” with .html_safe or (more likely) a different escaping helper like sanitize, the tag helper will not escape the value again (that is the purpose of .html_safe). However, not all sanitizers/escape methods escape double quotes, which are dangerous inside of tag attributes. In particular, double quotes allow an attacker to close the current attribute and insert new attributes (like onmouseover) that can execute JavaScript.

Brakeman will issue a generic warning about CVE-2016-6316 for affected versions and may generate warnings for potentially dangerous calls to content_tag.



The JSON bug is back. Specially-crafted queries can cause parameters to be interpreted as empty hashes, which may cause unexpected behavior in SQL queries.

Brakeman will generate a generic warning for affected versions (4.2 series).



Unrelated, Brakeman now uses Minitest instead of test-unit.



The SHA256 sums for this release are

7231e00bdb4353ee7e91e5f1e60e34cf29b5563e6f7e1e5478223e72568c493a  brakeman-3.3.5.gem
c07e282c2e1733f8d7db4a4ffefe22e7e38a62ddfd750f0866c0b49070cb61c9  brakeman-lib-3.3.5.gem
a7f8e6fa8eb4254b7ad17080180289794a02641b1f2ec362de57cfdb2f1535be  brakeman-min-3.3.5.gem

Reporting Issues

Thank you to everyone who reported bugs.

Please report any issues with this release! Take a look at this guide to reporting Brakeman problems.

Also consider following @brakeman on Twitter and hanging out on Gitter for questions and discussion.