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Vital Distant Code Execution Vulnerability Present in vm2 Sandbox Library

By Ionut Arghire on October 10, 2022

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A essential vulnerability in vm2 could enable a distant attacker to flee the sandbox and execute arbitrary code on the host.

A extremely standard JavaScript sandbox library with greater than 16 million month-to-month downloads, vm2 helps the execution of untrusted code synchronously in a single course of.

In August 2022, safety researchers with Oxeye found CVE-2022-36067, a critical-severity defect in vm2 assessed with a CVSS rating of 10 and which ought to put all vm2 customers on alert, because of its potential widespread impression.

The basis reason for the vulnerability, which Oxeye’s researchers have named SandBreak, resides in the best way vm2 maintainers carried out a Node.js function that enables them to customise the decision stack of errors within the software program testing framework.

“Whereas reviewing the earlier bugs disclosed to the vm2 maintainers, we seen an fascinating approach: the bug reporter abused the error mechanism in Node.js to flee the sandbox,” Oxeye senior safety researcher Gal Goldshtein stated.

When an error happens, Node.js calls a particular methodology and offers it with an array of ‘CallSite’ objects as arguments. A number of the CallSite objects, the researchers clarify, could return objects created exterior the sandbox.

An attacker controlling one of many returned objects could “entry Node’s world objects and execute arbitrary system instructions from there”, Oxeye says.

To mitigate the danger, the vm2 implementation wrapped objects and the known as methodology (the prepareStackTrace perform of the Error object) in a fashion that prevented customers from overriding it.

Nonetheless, as a result of they didn’t wrap all particular strategies, an attacker might present their very own implementation of the prepareStackTrace methodology and escape the sandbox.

Oxeye’s researchers had been additionally in a position to override the worldwide Error object with their very own implementation that additionally included a customized prepareStackTrace perform. When known as, it could discover a CallSite object exterior the sandbox, permitting for the execution of arbitrary code on host.

The SandBreak vulnerability was addressed with the discharge of vm2 model 3.9.11 on August 28, however technical particulars on the bug haven’t been offered till now. Oxeye plans on publishing a technical weblog put up later this week.

Oxeye requires AppSec engineers, R&D leaders, and safety professionals to be sure that all vm2 sandbox situations inside their environments are patched.

“Though sandboxes are supposed to run untrusted code inside your software, you shouldn’t routinely assume that they’re protected. If using a sandbox is unavoidable, it’s endorsed to separate the logical delicate a part of your software from the microservice that runs the sandbox code so if a menace actor efficiently breaks out from the sandbox, the assault floor is restricted to the remoted microservice,” Oxeye architect Yuval Ostrovsky stated.

Associated: Two Distant Code Execution Vulnerabilities Patched in WhatsApp

Associated: NVIDIA Patches Code Execution Vulnerabilities in Graphics Driver

Associated: Many Web-Uncovered Servers Affected by Exploited Redis Vulnerability

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