Service interruption via exponential URL regex backtracking
Published Jun 1, 2022 · Updated Sep 16, 2024
Regular expression denial of service in jQuery Validation Plugin before 1.19.4 allows remote attackers to interrupt client-side validation. The url2 method applies an inefficient URL-matching regular expression to arbitrary form input, causing exponential backtracking that blocks JavaScript execution. Exposure requires an application to load the additional-methods module and invoke url2 on attacker-controlled input; the resulting service interrupt is confined to the browser execution context.
Summary
What happened
Regular expression denial of service in jQuery Validation Plugin before 1.19.4 allows remote attackers to interrupt client-side validation. The url2 method applies an inefficient URL-matching regular expression to arbitrary form input, causing exponential backtracking that blocks JavaScript execution. Exposure requires an application to load the additional-methods module and invoke url2 on attacker-controlled input; the resulting service interrupt is confined to the browser execution context.
The record
- CVE
- CVE-2021-43306
- Published
- Jun 1, 2022
- Updated
- Sep 16, 2024
- Vendor
- jQuery Validation
- Product
- jQuery Validation Plugin
- Classifications
- CWE-1333, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 1, 2022CVE publishedPublication date reported by the CVE source.
- Sep 16, 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=unspecified <1.19.4
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
- JFrog url2 ReDoS triggerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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