CVE-2020-5217

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Summary

CVECVE-2020-5217
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-01-23 03:15:00 UTC
Updated2020-05-21 13:51:00 UTC
DescriptionIn 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.

Risk And Classification

Problem Types: CWE-74

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Twitter Secure Headers All All All All
Application Twitter Secure Headers All All All All

References

ReferenceSourceLinkTags
escape semicolons by replacing them with spaces for 5.x line by oreoshake · Pull Request #421 · github/secure_headers · GitHub MISC github.com Third Party Advisory
Filtering CSP entries to prevent bypassing rules · Issue #418 · github/secure_headers · GitHub MISC github.com Exploit, Third Party Advisory
Merge pull request #421 from twitter/escape-semi-colons-5.x · github/secure_headers@936a160 · GitHub MISC github.com Patch
Directive injection when using dynamic overrides with user input · Advisory · github/secure_headers · GitHub CONFIRM github.com Mitigation, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 238742 Red Hat Update for Satellite 6.8 release (RHSA-2020:4366)
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