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A journey into forgotten Null Session and MS-RPC interfaces, part 2
- In the part two of the research on Null Session and MS-RPC interfaces, the author delves into the difficulty of preventing and monitoring domain information enumeration without authentication.
- Despite attempts to block such activities using group policies like 'Restrict Unauthenticated RPC Clients', issues arise, such as domain controller functionalities being severely disrupted.
- The article discusses the impact of setting the group policy to 'Authenticated without exceptions' on remote WMI access and broader domain functionality.
- The research explores MS-RPC security and methods to secure RPC servers, focusing on interfaces like MS-NRPC, using theoretical insight and reverse engineering for deeper understanding.
- Various challenges in detecting and monitoring RPC activity without authentication are highlighted, with insights on using Event Tracing for Windows and third-party tools like RPC-Firewall.
- Detailed explanations are provided on registration flags, securing endpoints and interfaces, and binding authentication for RPC servers.
- The article concludes with in-depth analyses using automated tools and reverse engineering, revealing how the MS-NRPC interface security mechanism enables bypassing security checks and accessing functions without authentication.
- Insights into security callbacks, security descriptors, and the intricacies of RPC security add depth to the exploration, shedding light on the author's investigative approaches.
- The comprehensive research aims to empower readers with an understanding of the complexities surrounding no-authentication enumeration and offers insights for detection and mitigation.
- Through detailed analysis and reverse engineering, the article provides a holistic view of the security mechanisms behind the MS-NRPC interface and how bypassing security checks is facilitated.
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