April 7, 2023
The VM2 library is designed to run untrusted code in an isolated context on Node.js servers, allowing partial execution of the code and preventing unauthorized access to system resources or external data. The vulnerability was found to be caused by improper handling of host objects passed to the 'Error.prepareStackTrace' function when an asynchronous error occurs. The security advisory states, “A threat actor can bypass the sandbox protections to gain remote code execution rights on the host running the sandbox.” The issue affects all versions of VM2 from 3.9.14 and older. A new version of the library, 3.9.15, has been released to address the problem, with no workaround available.
Seongil Wi, a KAIST Ph.D. student, published two variations of the exploit code for CVE-2023-29017 on GitHub in a secret repository after the release of the new VM2 version. The PoCs, in their published form, simply create a new file named 'flag' on the host system, proving that VM2’s sandbox protections can be bypassed, allowing the execution of commands to create arbitrary files on the host system.
In October 2022, VM2 faced another critical flaw, CVE-2022-36067, which also enabled attackers to escape the sandbox environment and run commands on the host system. That issue was also fixed swiftly with the release of a new version of the library.
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