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CVE-2020-5217 PUBLISHED

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.

EPSS 0.52% · 66.7th percentile

Risk Scores

EPSS Score
0.52%
66.7th percentile

Affected Products

VendorProductVersions
Ubuntu:18.04:LTSruby-secure-headers0, 3.7.1-1
Ubuntu:20.04:LTSruby-secure-headers0, 6.0.0-1, 6.1.1-1

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