GHSA-2x63-gw47-w4mm
websocket-driver-ruby: Denial of service via malformed Host header
Quick fix
GHSA-2x63-gw47-w4mm — websocket-driver: upgrade to the fixed version with the command below.
bundle update websocket-driverDetails
### Impact
If this library is used to implement a WebSocket server on top of a TCP server, by using the `WebSocket::Driver.server()` method, then a client can cause the server to crash by sending a `Host` header that is not a valid `host[:port]` string. When this happens, a `URI::InvalidURIError` exception is raised which is not caught, and this can cause the server process to crash if the application does not catch the error from the `parse()` method itself.
### Patches
The issue has been patched in version 0.8.2 by making the request parser catch `URI::InvalidURIError` and enter an error state if the `Host` header is malformed. This means the request is considered invalid and should not establish a WebSocket connection.
### Workarounds
No known workarounds exist.
### Acknowledgements
This issue was discovered and reported by Pranjali Thakur, DepthFirst Security Research Team.
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