CSRF token disclosure via cross-domain XHR
Published Jun 19, 2020 · Updated Aug 4, 2024
Cross-site request forgery in Ruby on Rails rails-ujs before 5.2.4.3 and 6.0.0 through 6.0.3 allows remote attackers to disclose CSRF tokens. The createXHR routine adds X-CSRF-Token to XMLHttpRequest objects without first excluding cross-domain requests, so a crafted cross-origin form action or link target receives the token. The application must use rails-ujs, expose attacker control over a POST-triggering href or form action, and persuade a user to activate it; the bounded consequence is disclosure of that user's CSRF token to the attacker's domain.
Summary
What happened
Cross-site request forgery in Ruby on Rails rails-ujs before 5.2.4.3 and 6.0.0 through 6.0.3 allows remote attackers to disclose CSRF tokens. The createXHR routine adds X-CSRF-Token to XMLHttpRequest objects without first excluding cross-domain requests, so a crafted cross-origin form action or link target receives the token. The application must use rails-ujs, expose attacker control over a POST-triggering href or form action, and persuade a user to activate it; the bounded consequence is disclosure of that user's CSRF token to the attacker's domain.
The record
- CVE
- CVE-2020-8167
- Published
- Jun 19, 2020
- Updated
- Aug 4, 2024
- Vendor
- Ruby on Rails
- Product
- Ruby on Rails
- Classifications
- CWE-352, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 19, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Fixed in 5.2.4.3, 6.0.3.1
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
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Technologies
Your stack
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Your stack
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