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Sandbox Breakout / Arbitrary Code Execution in safer-eval

Critical severity GitHub Reviewed Published Oct 21, 2019 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

npm safer-eval (npm)

Affected versions

< 1.3.4

Patched versions

1.3.4

Description

Versions of safer-eval prior to 1.3.4 are vulnerable to Sandbox Escape leading to Remote Code Execution. A payload using constructor properties can escape the sandbox and execute arbitrary code. For example, evaluating he string console.constructor.constructor('return process')().env prints process.env to the console.

Recommendation

Upgrade to version 1.3.4 or later.

References

Published by the National Vulnerability Database Oct 15, 2019
Reviewed Oct 17, 2019
Published to the GitHub Advisory Database Oct 21, 2019
Last updated Feb 1, 2023

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS score

0.131%
(49th percentile)

Weaknesses

CVE ID

CVE-2019-10759

GHSA ID

GHSA-r3x4-wr4h-pw33

Source code

No known source code
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