CVE-2021-23436: immer_project immer Type Confusion

Vulnerability summary

CVE-2021-23436 is a critical (CVSS 9.8) Type Confusion vulnerability in immer_project immer. EPSS estimates a 1.78% chance of exploitation in the next 30 days, higher than 78% of scored vulnerabilities. 2 public exploits are recorded.

Timeline

1. 01-09-2021
   PublishedVulnerability first disclosed.
2. 16-09-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-843Access of Resource Using Incompatible Type ('Type Confusion')The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.