Cross-context XSS via control-character URL parsing
Published Feb 21, 2022 · Updated Aug 2, 2024
Authorization bypass in Unshift.io url-parse before 1.5.9 allows remote attackers to influence security decisions via crafted URLs. The parser leaves leading control characters in input, misclassifying absolute schemes and hostnames compared with WHATWG parsing; consumers that trust those fields can bypass URL checks and enable script execution such as javascript: XSS. Exploitation requires an application to use url-parse results for authorization or scheme filtering, with impact limited to the security decisions and rendering performed by that consumer.
Summary
What happened
Authorization bypass in Unshift.io url-parse before 1.5.9 allows remote attackers to influence security decisions via crafted URLs. The parser leaves leading control characters in input, misclassifying absolute schemes and hostnames compared with WHATWG parsing; consumers that trust those fields can bypass URL checks and enable script execution such as javascript: XSS. Exploitation requires an application to use url-parse results for authorization or scheme filtering, with impact limited to the security decisions and rendering performed by that consumer.
The record
- CVE
- CVE-2022-0691
- Published
- Feb 21, 2022
- Updated
- Aug 2, 2024
- Vendor
- Unshift.io
- Product
- url-parse
- Classifications
- CWE-639
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 21, 2022CVE publishedPublication date reported by the CVE source.
- Aug 2, 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=unspecified <1.5.9
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.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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