Horizon Alert
Summary of the vulnerability and why it matters
This advisory concerns a vulnerability in the webpack integration for @sentry/nextjs, a tool used for error tracking in JavaScript applications. The issue allows unauthenticated requests to bypass authorization controls under specific routing configurations, potentially exposing application routes. The primary concern is to confirm whether this specific integration and configuration are in use.
- Bypass security checks on certain web requests.
- Important for web applications using Sentry error tracking.
- Confirm if this Sentry integration is in use.
Attack Path
How an attacker could exploit the issue
An attacker could potentially bypass authorization checks by exploiting a misconfiguration in the webpack integration of @sentry/nextjs. This bypass occurs when a tunnelRoute is configured and an application route either directly conflicts with the tunnel path or a root dynamic segment resolves under it. If middleware is the sole method of authorization, an unauthenticated request could then reach and execute this route, leading to unintended access.
- Requires tunnelRoute and webpack build.
- Triggers when routes collide with tunnel path.
- Allows unauthenticated access to routes.
Live Threat
Current exploitation, exposure, and threat context
When supported by the advisory, an unauthenticated request could bypass middleware authorization for specific application routes that collide with a configured tunnel path. This could expose application logic or data accessible through those routes.
- Application routes could be exposed.
- Requests bypass middleware authorization.
- Unauthorized access to routes.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Sentry-Javascript's webpack integration for @sentry/nextjs affects applications using specific configurations. The primary responsibility for addressing this likely falls to application owners or platform teams managing the JavaScript build and application routes. The first crucial step is to identify all instances of the affected Sentry-Javascript versions, determine if the `tunnelRoute` is configured, and assess if any application routes or dynamic segments directly collide with the `tunnelRoute` or its subpaths, thereby bypassing middleware authorization.
- Application owners and platform teams.
- Verify `tunnelRoute` configuration and route collisions.
- Plan remediation based on exposure and business criticality.
