Prototype pollution via unsafe deepMerge key recursion
Published May 30, 2023 · Updated Jan 10, 2025
Prototype pollution in @antfu/utils before 0.7.3 allows remote authenticated users to alter inherited properties through deepMerge. The function recursively merges attacker-controlled object keys without rejecting proto, constructor, or prototype, modifying the prototype chain. A consuming application must pass an attacker-controlled object to deepMerge; successful exploitation can expose data or interrupt that application.
Summary
What happened
Prototype pollution in @antfu/utils before 0.7.3 allows remote authenticated users to alter inherited properties through deepMerge. The function recursively merges attacker-controlled object keys without rejecting proto, constructor, or prototype, modifying the prototype chain. A consuming application must pass an attacker-controlled object to deepMerge; successful exploitation can expose data or interrupt that application.
The record
- CVE
- CVE-2023-2972
- Published
- May 30, 2023
- Updated
- Jan 10, 2025
- Vendor
- Anthony Fu
- Product
- @antfu/utils
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 30, 2023CVE publishedPublication date reported by the CVE source.
- Jan 10, 2025Record 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 <0.7.3
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 deepMerge 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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