GHSA-gfc2-9qmw-w7vh Glances: Cross-Origin Information Disclosure via Unauthenticated REST API (/api/4) due to Permissive CORS

• PyPI Glances: < 4.5.4 → fixed in 4.5.4

Summary The Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Control-Allow-Origin: *`). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (`/api/4/*`) is also affected and exposes significantly more sensitive data. Details When Glances is started in web mode (e.g., `glances -w -B 0.0.0.0`), it exposes a REST API endpoint at: http://:61208/api/4/all The server responds with: Access-Control-Allow-Origin: * This allows any origin to perform cross-origin requests and read responses. The `/api/4/all` endpoint returns extensive system information, including: • Process list (`processlist`) • System details (hostname, OS, CPU info) • Memory and disk usage • Network interfaces and IP address • Running services and metrics Because no authentication is required by default, this data is accessible to any web page. PoC 1. Start Glances: glances -w -B 0.0.0.0 2. Create a malicious HTML file: ``` fetch("http://:61208/api/4/all") .then(r => r.json()) .then(data => { console.log("DATA:", data); }); ``` 2. Open the file in a browser while Glances is running. 3. Observe that the browser successfully retrieves sensitive system information from the API. This works cross-origin (e.g., from file:// or attacker-controlled domains). Impact A remote attacker can host a malicious website that, when visited by a victim running Glances, can: • Read sensitive system information • Enumerate running processes • Identify network configuration and IP addresses • Fingerprint the host system This requires no authentication and no user interaction beyond visiting a web page. This represents a cross-origin information disclosure vulnerability and can aid further attacks such as reconnaissance or targeted exploitation.