Impact
The import-in-the-middle loader works by generating a wrapper module on the fly. The wrapper uses the module specifier to load the original module and add some wrapping code. It allows for remote code execution in cases where an application passes user-supplied input directly to an import() function.
Patches
This vulnerability has been patched in import-in-the-middle version 1.4.2
Workarounds
- Do not pass any user-supplied input to
import(). Instead, verify it against a set of allowed values.
- If using
import-in-the-middle and support for EcmaScript Modules is not needed, ensure that none of the following options are set (either via command-line or the NODE_OPTIONS environment variable):
--loader=import-in-the-middle/hook.mjs
--loader import-in-the-middle/hook.mjs
References
If you have any questions or comments about this advisory, email us at [email protected]
Impact
The
import-in-the-middleloader works by generating a wrapper module on the fly. The wrapper uses the module specifier to load the original module and add some wrapping code. It allows for remote code execution in cases where an application passes user-supplied input directly to an import() function.Patches
This vulnerability has been patched in
import-in-the-middleversion 1.4.2Workarounds
import(). Instead, verify it against a set of allowed values.import-in-the-middleand support for EcmaScript Modules is not needed, ensure that none of the following options are set (either via command-line or theNODE_OPTIONSenvironment variable):References
If you have any questions or comments about this advisory, email us at [email protected]