# NAC Bypass ## Captive Portal Certain NAC systems leverage a captive portal authentication system to validate a user's identify before granting access to the rest of the network. ### No SSL If the captive portal doesn't have TLS protection we can consider MiTM attacks on other users. ## Tools ### silentbridge Silentbridge is a toolkit for bypassing 802.1x-2010 and 802.1x-2004. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://infra.newerasec.com/infrastructure-testing/gaining-access/nac-bypass.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.