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CVE-2019-10759:
Sandbox Breakout / Arbitrary Code Execution in safer-eval

10

CVSS Score

Basic Information

EPSS Score
-
Published
10/21/2019
Updated
2/1/2023
KEV Status
No
Technology
TechnologyJavaScript

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Package NameEcosystemVulnerable VersionsFirst Patched Version
safer-evalnpm< 1.3.41.3.4

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from insufficient sanitization of constructor properties in the sandbox environment. The security patch adds explicit overrides for context.console.constructor.constructor and modifies Object.constructor.constructor handling, indicating these properties were previously accessible. The exports.createContext function is responsible for setting up the execution context, and its pre-patch version allowed access to dangerous constructor chains. The added test cases specifically validate against console.constructor.constructor exploitation paths, confirming this as the primary vector.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

V*rsions o* `s***r-*v*l` prior to *.*.* *r* vuln*r**l* to S*n**ox *s**p* l***in* to R*mot* *o** *x**ution. * p*ylo** usin* *onstru*tor prop*rti*s **n *s**p* t** s*n**ox *n* *x**ut* *r*itr*ry *o**. *or *x*mpl*, *v*lu*tin* ** strin* `*onsol*.*onstru*to

Reasoning

T** vuln*r**ility st*ms *rom insu**i*i*nt s*nitiz*tion o* *onstru*tor prop*rti*s in t** s*n**ox *nvironm*nt. T** s**urity p*t** ***s *xpli*it ov*rri**s *or *ont*xt.*onsol*.*onstru*tor.*onstru*tor *n* mo*i*i*s O*j**t.*onstru*tor.*onstru*tor **n*lin*,