Pithikos WebSocket Server Input Validation Vulnerability Allowing Information Disclosure and Server Disruption

An input validation vulnerability has been identified in Pithikos WebSocket Server version 0.6.4. This issue allows remote attackers to access sensitive information or disrupt server operations by sending unvalidated messages through the WebSocket connection. The vulnerability arises because the server processes incoming messages without adequate checks, such as input size limits, format validation, or proper exception handling. As a result, malformed or specially crafted payloads can cause server-side errors, lead to unstable behavior, or expose internal error states, depending on the server's configuration.

Impact

Exploitation of this vulnerability can cause server-side exceptions, induce unstable or unexpected server behavior, and potentially reveal internal error states, depending on the server's configuration.

Reproduction

The vulnerability can be reproduced by running a WebSocket server using the Pithikos WebSocket Server package version 0.6.4. Once the server is running, a client can be used to send crafted WebSocket messages that exploit the lack of input validation. This can be done using the included 'poc.py' file, which demonstrates sending unvalidated input to the vulnerable server.