Inherited property modification via unchecked recursive merge
Published Dec 8, 2023 · Updated Aug 2, 2024
Prototype pollution in all versions of nuysoft Mock.js allows remote attackers to alter inherited object properties through crafted input. Util.extend recursively copies enumerable properties without rejecting proto, constructor, or prototype keys, causing writes into Object.prototype. Exploitation requires a consuming application to pass attacker-controlled objects to an exposed extend method; inherited values then alter application logic or crash its process.
Summary
What happened
Prototype pollution in all versions of nuysoft Mock.js allows remote attackers to alter inherited object properties through crafted input. Util.extend recursively copies enumerable properties without rejecting proto, constructor, or prototype keys, causing writes into Object.prototype. Exploitation requires a consuming application to pass attacker-controlled objects to an exposed extend method; inherited values then alter application logic or crash its process.
The record
- CVE
- CVE-2023-26158
- Published
- Dec 8, 2023
- Updated
- Aug 2, 2024
- Vendor
- nuysoft
- Product
- Mock.js
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 8, 2023CVE publishedPublication date reported by the CVE source.
- Aug 2, 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 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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 mockjs 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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