Sandbox Breakout in realms-shim

Versions of realms-shim prior to 1.2.1 are vulnerable to a Sandbox Breakout. The Realms evaluation function has an option to apply Babel-like transformations to the source code before it reaches the evaluator. One portion of this transform pipeline exposed a primal-Realm object to the rewriting...

Sandbox Breakout

realms-shim is vulnerable to sandbox breakout. The Realms evaluation function has an option to apply Babel-like transformations to the source code before it reaches the evaluator. An attacker is able to provide a malicious rewriter function that uses the confined code used within the evaluator...