CVE-2021-23436 Prototype Pollution

2021-09-0100:00:00

snyk

www.cve.org

5.6 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

8.1 High

AI Score

Confidence

High

0.004 Low

EPSS

Percentile

74.8%

JSON

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.

CNA Affected

[
  {
    "product": "immer",
    "vendor": "n/a",
    "versions": [
      {
        "lessThan": "9.0.6",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      }
    ]
  }
]