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CVE-2023-38704: sanitize URLs · DataDog/import-in-the-middle@2531cdd
import-in-the-middle is a module loading interceptor specifically for ESM modules. Prior to version 1.4.2, 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. This vulnerability has been patched in import-in-the-middle version 1.4.2. Some workarounds are available. 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 certain options are set, either via command-line or the NODE_OPTIONS environment variable.
Expand Up @@ -122,7 +122,7 @@ function createHook (meta) { return { source: ` import { register } from ‘${iitmURL}’ import * as namespace from ‘${url}’ import * as namespace from ${JSON.stringify(url)} const set = {} ${exportNames.map((n) => ` let $${n} = namespace.${n} Expand All @@ -132,7 +132,7 @@ set.${n} = (v) => { return true } `).join(‘\n’)} register('${realUrl}’, namespace, set, ‘${specifiers.get(realUrl)}’) register(${JSON.stringify(realUrl)}, namespace, set, ${JSON.stringify(specifiers.get(realUrl))}) ` } } Expand Down
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### 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]](mailto:[email protected])