CVE-2021-21413 Information

Description

isolated-vm is a library for nodejs which gives you access to v8’s Isolate interface. Versions of isolated-vm before v4.0.0 have API pitfalls which may make it easy for implementers to expose supposed secure isolates to the permissions of the main nodejs isolate. Reference objects allow access to the underlying reference’s full prototype chain. In an environment where the implementer has exposed a Reference instance to an attacker they would be able to use it to acquire a Reference to the nodejs context’s Function object. Similar application-specific attacks could be possible by modifying the local prototype of other API objects. Access to NativeModule objects could allow an attacker to load and run native code from anywhere on the filesystem. If combined with for example a file upload API this would allow for arbitrary code execution. This is addressed in v4.0.0 through a series of related changes.

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Reference

https://github.com/laverdet/isolated-vm/commit/2646e6c1558bac66285daeab54c7d490ed332b15 https://github.com/laverdet/isolated-vm/security/advisories/GHSA-mmhj-4w6j-76h7 https://github.com/laverdet/isolated-vm/blob/main/CHANGELOG.md#v400 https://github.com/laverdet/isolated-vm/commit/27151bfecc260e96714443613880e3b2e6596704

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.6