This affects the package immer before 9.0.6. A type confusion vulnerability can lead to a bypass of CVE-2020-28477 when the user-provided keys used in the path parameter are arrays. In particular, this bypass is possible because the condition (p === "__proto__" || p === "constructor") in applyPatches_ returns false if p is ['__proto__'] (or ['constructor']). The === operator (strict equality operator) returns false if the operands have different type.
CVE-2021-23436 - Medium Severity Vulnerability
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Library home page: https://registry.npmjs.org/immer/-/immer-8.0.1.tgz
Path to dependency file: /package.json
Path to vulnerable library: /node_modules/immer/package.json
Dependency Hierarchy: - react-scripts-4.0.3.tgz (Root Library) - react-dev-utils-11.0.4.tgz - :x: **immer-8.0.1.tgz** (Vulnerable Library)
Found in HEAD commit: 2d41f06ec8faa6317e843654af85f7dacef9b46e
Found in base branch: master
This affects the package immer before 9.0.6. A type confusion vulnerability can lead to a bypass of CVE-2020-28477 when the user-provided keys used in the path parameter are arrays. In particular, this bypass is possible because the condition (p === "__proto__" || p === "constructor") in applyPatches_ returns false if p is ['__proto__'] (or ['constructor']). The === operator (strict equality operator) returns false if the operands have different type.
Publish Date: 2021-09-01
URL: CVE-2021-23436
Base Score Metrics: - Exploitability Metrics: - Attack Vector: Network - Attack Complexity: High - Privileges Required: None - User Interaction: None - Scope: Unchanged - Impact Metrics: - Confidentiality Impact: Low - Integrity Impact: Low - Availability Impact: Low
For more information on CVSS3 Scores, click here.Type: Upgrade version
Origin: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23436
Release Date: 2021-09-01
Fix Resolution (immer): 9.0.6
Direct dependency fix Resolution (react-scripts): 5.0.0
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