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STEWS Vulnerability Detection Tool

The STEWS (Security Tool for Enumerating WebSockets) vulnerability detection tool allows users to test whether a WebSockets endpoint is vulnerable to known CVEs or other WebSockets vulnerabilities.

The tool currently supports tests for vulnerabilities including:

  • CSWSH (Cross-Site WebSocket Hijacking)
  • CVE-2020-27813 (Gorilla DoS Integer Overflow)
  • CVE-2020-7662 & CVE-2020-7663 (faye Sec-WebSocket-Extensions Regex DoS)
  • CVE-2021-32640 (ws Sec-Websocket-Protocol Regex DoS)

A more complete list of CVEs that this tool might support in the future can be found in the Awesome WebSocket Security repository.

Basic Usage

First, make sure you have the necessary Python 3 dependencies installed using pip3 install -r requirements.txt. Then if you run python3 STEWS-vuln-detect.py -h you will be greeted by the following options:

usage: STEWS-vuln-detect.py [-h] [-v] [-d] [-u URL] [-f FILE] [-n] [-k] [-o ORIGIN] [-1] [-2] [-3] [-4]

Security Testing and Enumeration of WebSockets (STEWS) Vulnerability Detection Tool

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose         Enable verbose tracing of communications
  -d, --debug           Print each test case to track progress while running
  -u URL, --url URL     URL to connect to
  -f FILE, --file FILE  File containing URLs to check for valid WebSocket connections
  -n, --no-encryption   Connect using ws://, not wss:// (default is wss://)
  -k, --nocert          Ignore invalid SSL cert
  -o ORIGIN, --origin ORIGIN
                        Set origin
  -1                    Test for generic Cross-site WebSocket Hijacking (CSWSH)
  -2                    Test CVE-2021-32640 - ws Sec-Websocket-Protocol Regex DoS
  -3                    Test CVE-2020-7662 & 7663 - faye Sec-WebSocket-Extensions Regex DoS
  -4                    Test CVE-2020-27813 - Gorilla DoS Integer Overflow

Test 1 provides a generic CSWSH test. This can be used in combination with the -o flag to specify a specific origin to attempt to bypass any server-side checks.

Tests 2, 3, and 4 check for specific CVEs. The test cases for these were created based on the PoC code published as part of the discovery of these CVEs. For example, to run test 4 on a local server on port 8084, you can run: python3 STEWS-vuln-detect.py -4 -n -u 127.0.0.1:8084

Areas for future work

  1. Add additional CVE detection tests based on list of CVEs in Awesome WebSocket Security repository
  2. Add test for WebSocket smuggling
  3. Add tests for misconfigurations (e.g. WebSocket protocol JSON input issues)