Security Analysis of SIP Signalling during NASS-IMS bundled Authentication

This paper deals with issues related to the way in which clients authenticate to NASS and simultaneously also gain service layer authentication using the single sign-on NASS bundled authentication. A security analysis of SIP sequence messages during NASS-IMS bundled authentication is presented. Through this analysis we aim to identify the SIP vulnerabilities during the NASS-IMS bundled authentication. To demonstrate the signaling we will use emulation software and we will design specific test cases. From this we will identify vulnerability issues during SIP signaling in the NASS-IMS bundled Authentication as well as interesting conclusions regarding NASS functionalities.