This article is part of the new OWASP Testing Guide v4.
Back to the OWASP Testing Guide v4 ToC: https://www.owasp.org/index.php/OWASP_Testing_Guide_v4_Table_of_Contents Back to the OWASP Testing Guide Project: https://www.owasp.org/index.php/OWASP_Testing_Project
Description of the Issue
It is the server’s responsibility to verify the Origin header in the initial HTTP WebSocket handshake. If the server does not validate the origin header in the initial WebSocket handshake the WebSocket server may accept connections from any origin. This could allow attackers to communicate with the WebSocket server cross-domain allowing for Top 10 2013-A8-Cross-Site Request Forgery (CSRF) type issues.
Confidentiality and Integrity
WebSockets can be used over unencrypted TCP or over encrypted TLS. To use unencrypted WebSockets the ws:// URI scheme is used (default port 80), to use encrypted (TLS) WebSockets the wss:// URI scheme is used (default port 443). Look out for Top 10 2013-A6-Sensitive Data Exposure type issues.
WebSockets do not handle authentication, instead normal application authentication mechanisms apply, such as cookies, HTTP Authentication or TLS authentication. Look out for Top 10 2013-A2-Broken Authentication and Session Management type issues.
WebSockets do not handle authorisation, normal application authorisation mechanisms apply. Look out for Top 10 2013-A4-Insecure Direct Object References and Top 10 2013-A7-Missing Function Level Access Control type issues.
Black Box testing and example
How to test using black box approach.
Gray Box testing
- HTML5 Rocks - Introducing WebSockets: Bringing Sockets to the Web: http://www.html5rocks.com/en/tutorials/websockets/basics/
- W3C - The WebSocket API: http://dev.w3.org/html5/websockets/
- IETF - The WebSocket Protocol: https://tools.ietf.org/html/rfc6455
- Christian Schneider - Cross-Site WebSocket Hijacking (CSWSH): http://www.christian-schneider.net/CrossSiteWebSocketHijacking.html
- Jussi-Pekka Erkkilä - WebSocket Security Analysis: http://juerkkil.iki.fi/files/writings/websocket2012.pdf
- Robert Koch- On WebSockets in Penetration Testing: http://www.ub.tuwien.ac.at/dipl/2013/AC07815487.pdf
- OWASP Zed Attack Proxy (ZAP) - https://www.owasp.org/index.php/OWASP_Zed_Attack_Proxy_Project
ZAP is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications. It is designed to be used by people with a wide range of security experience and as such is ideal for developers and functional testers who are new to penetration testing. ZAP provides automated scanners as well as a set of tools that allow you to find security vulnerabilities manually.