Object prototype modification via unchecked route keys
Published Apr 7, 2020 · Updated Aug 4, 2024
Prototype pollution in LingyuCoder express-mock-middleware 0.0.6 and earlier allows local users to alter Object.prototype properties. The update routine loads files matched by mock/**/*.js, splits each exported key into method and URI values, and assigns them as nested object keys without blocking proto. The attacker must create the mock directory and place a crafted exported object there, after which pollution changes inherited properties in the hosting Node.js process.
Summary
What happened
Prototype pollution in LingyuCoder express-mock-middleware 0.0.6 and earlier allows local users to alter Object.prototype properties. The update routine loads files matched by mock/**/*.js, splits each exported key into method and URI values, and assigns them as nested object keys without blocking proto. The attacker must create the mock directory and place a crafted exported object there, after which pollution changes inherited properties in the hosting Node.js process.
The record
- CVE
- CVE-2020-7616
- Published
- Apr 7, 2020
- Updated
- Aug 4, 2024
- Vendor
- LingyuCoder
- Product
- express-mock-middleware
- Classifications
- CWE-1321
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 7, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=All versions including 0.0.6
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 express-mock-middleware 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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