CSP header injection via unsanitized newlines
Published Jan 23, 2020 · Updated Aug 4, 2024
Header injection in Twitter secure_headers allows remote authenticated users to add CSP headers through crafted dynamic directives. The content-security-policy builder passes newline-containing source-list values to Rails without removing line breaks, so Rails emits each remainder as another Content-Security-Policy header. Exploitation requires an application to feed attacker-controlled data into a dynamic override and user interaction; the effect is limited to extra CSP headers in the affected response.
Summary
What happened
Header injection in Twitter secure_headers allows remote authenticated users to add CSP headers through crafted dynamic directives. The content-security-policy builder passes newline-containing source-list values to Rails without removing line breaks, so Rails emits each remainder as another Content-Security-Policy header. Exploitation requires an application to feed attacker-controlled data into a dynamic override and user interaction; the effect is limited to extra CSP headers in the affected response.
The record
- CVE
- CVE-2020-5216
- Published
- Jan 23, 2020
- Updated
- Aug 4, 2024
- Vendor
- Product
- secure_headers
- Classifications
- CWE-113
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 23, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 3.9.0
- Affected versionversion=>= 5.0.0, < 5.2.0
- Affected versionversion=>= 6.0.0, < 6.3.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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