Prototype pollution via unchecked keys and paths
Published Dec 24, 2021 · Updated Sep 16, 2024
Prototype pollution in JSData 3.0.10 and earlier allows attackers to modify Object.prototype through crafted keys or paths. The deepFillIn merge recursively follows an attacker-controlled proto key into Object.prototype, while set passes crafted path segments through mkdirP without rejecting prototype names. Reachability requires a consuming application to pass untrusted objects or property paths to either utility; the demonstrated consequence is process-wide inherited-property modification, while further effects depend on how the application uses polluted properties.
Summary
What happened
Prototype pollution in JSData 3.0.10 and earlier allows attackers to modify Object.prototype through crafted keys or paths. The deepFillIn merge recursively follows an attacker-controlled proto key into Object.prototype, while set passes crafted path segments through mkdirP without rejecting prototype names. Reachability requires a consuming application to pass untrusted objects or property paths to either utility; the demonstrated consequence is process-wide inherited-property modification, while further effects depend on how the application uses polluted properties.
The record
- CVE
- CVE-2021-23574
- Published
- Dec 24, 2021
- Updated
- Sep 16, 2024
- Vendor
- js-data
- Product
- JSData
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 24, 2021CVE 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?
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- Affected versionversion=0 <unspecified
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
- Snyk deepFillIn and set proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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