Object prototype modification via dotted query keys
Published Apr 23, 2021 · Updated Aug 3, 2024
Prototype pollution in Bevry jQuery Sparkle 1.5.2-beta allows remote attackers to modify Object.prototype through a crafted URL query. String.prototype.queryStringToJSON splits query keys on periods, constructs property paths with eval, and accepts proto or constructor.prototype segments without blocking prototype traversal. The vulnerable page must invoke the parser on its URL; the immediate effect is inherited-property modification, while downstream impact depends on how those properties are used.
Summary
What happened
Prototype pollution in Bevry jQuery Sparkle 1.5.2-beta allows remote attackers to modify Object.prototype through a crafted URL query. String.prototype.queryStringToJSON splits query keys on periods, constructs property paths with eval, and accepts proto or constructor.prototype segments without blocking prototype traversal. The vulnerable page must invoke the parser on its URL; the immediate effect is inherited-property modification, while downstream impact depends on how those properties are used.
The record
- CVE
- CVE-2021-20084
- Published
- Apr 23, 2021
- Updated
- Aug 3, 2024
- Vendor
- Bevry
- Product
- jQuery Sparkle
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 23, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 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=1.5.2-beta
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
- BlackFan jQuery Sparkle prototype-pollution proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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