GHSA-7x3h-rm86-3342

Описание

Summary

A sandbox escape vulnerabilities due to a mismatch between the key on which the validation is performed and the key used for accessing properties.

Details

Even though the key used in property accesses (b in the code below) is annotated as string, this is never enforced: https://github.com/nyariv/SandboxJS/blob/6103d7147c4666fe48cfda58a4d5f37005b43754/src/executor.ts#L304-L304 So, attackers can pass malicious objects that coerce to different string values when used, e.g., one for the time the key is sanitized using hasOwnProperty(key) and a different one for when the key is used for the actual property access.

PoC

Impact

Remote code execution, if attacker can execute code inside the sandbox.