Inherited property modification via unsafe merge
Published Sep 1, 2021 · Updated Sep 16, 2024
Prototype pollution in Proto 1.0.19 and earlier allows remote attackers to modify inherited properties through crafted merge input. The merge function accepts an attacker-controlled proto key and recursively copies its nested properties onto Object.prototype. Exploitation requires a consuming application to pass attacker-controlled objects to merge; downstream effects depend on how inherited properties influence that application.
Summary
What happened
Prototype pollution in Proto 1.0.19 and earlier allows remote attackers to modify inherited properties through crafted merge input. The merge function accepts an attacker-controlled proto key and recursively copies its nested properties onto Object.prototype. Exploitation requires a consuming application to pass attacker-controlled objects to merge; downstream effects depend on how inherited properties influence that application.
The record
- CVE
- CVE-2021-23426
- Published
- Sep 1, 2021
- Updated
- Sep 16, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 1, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- Proto merge 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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