| Package | Affected versions | Patched versions |
|---|---|---|
| appium/base-driver | < 10.7.0 | 10.7.0 |
| @appium/base-driver | < 10.7.0 | 10.7.0 |
Appium's base-driver mounts the built-in /test/guinea-pig, /test/guinea-pig-scrollable and /test/guinea-pig-app-banner routes unconditionally on every server. The handler reflects the throwError query param, the comments POST field, and the User-Agent request header into the returned HTML via compileLodashTemplate, which interpolates <%= expr %> as String(expr) with no HTML/JS escaping. This yields reflected XSS, and the throwError value is reflected inside a <script> block, giving arbitrary JavaScript execution on the server's origin. No authentication, no session, no driver and no plugin are required, and the default bind address is 0.0.0.0.
@appium/base-driver 10.6.0 (with Appium server 3.5.0); tested live.@appium/base-driver lib/utils.ts compileLodashTemplate.base-driver/lib/express/server.ts:216-219
(app.all('/test/guinea-pig', guineaPig) etc.).base-driver/lib/express/static.ts:35-61 (guineaPigTemplate) —
throwError = String(req.params.throwError ?? req.query?.throwError), params.comment = String(req.body.comments), params.userAgent = req.headers['user-agent'].base-driver/lib/utils.ts:67-83 (compileLodashTemplate)
emits <%= expr %> as String(${expr}) via new Function(...), no escaping.base-driver/static/test/guinea-pig.html:11-12
(throwError inside <script>), :50 (comment), :87 (userAgent); same in guinea-pig-scrollable.html / guinea-pig-app-banner.html.Requests:
GET /test/guinea-pig?throwError=x%27%2balert(document.domain)%2b%27
POST /test/guinea-pig (body: comments=</span><img src=x onerror=alert(1)>)
GET /test/guinea-pig (header: User-Agent: <script>alert(7)</script>)
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Scan my site freeAn attacker who can get a victim to open a crafted link (or auto-submit a form) to the Appium server executes arbitrary JavaScript on the server's origin. With default CORS * + no authentication, that JS can drive the WebDriver REST API and plugin endpoints. The endpoints are debug/test fixtures that should not be reachable on a production listener at all.