Exploiting known security holes in Microsoft’s PPTP Authentication Extensions (MS-CHAPv2)
نویسنده
چکیده
The implementation of the Point to Point Tunneling Protocol (PPTP) from Microsoft using MS-CHAPv2 and Microsoft Point to Point Encryption (mppe) is widely used to secure and control access to wireless networks. We show why the MS-CHAPv2 protocol is not suitable for user authentication in a heterogenous Unix network context.
منابع مشابه
Cryptanalysis of Microsoft's PPTP Authentication Extensions (MS-CHAPv2)
The Point-to-Point Tunneling Protocol (PPTP) is used to secure PPP connections over TCP/IP link. In response to [SM98], Microsoft released extensions to the PPTP authentication mechanism (MSCHAP), called MS-CHAPv2. We present an overview of the changes in the authentication and encryption-key generation portions of MSCHAPv2, and assess the improvements and remaining weaknesses in Microsoft’s PP...
متن کاملBreaking PPTP VPNs via RADIUS Encryption
We describe an efficient cross-protocol attack, which enables an attacker to learn the VPN session key shared between a victim client and a VPN endpoint. The attack recovers the key which is used to encrypt and authenticate VPN traffic. It leverages a weakness of the RADIUS protocol executed between VPN endpoint and RADIUS server, and allows an “insider” attacker to read the VPN traffic of othe...
متن کاملBreaking PPTP VPNs via RADIUS Encryption
We describe an efficient cross-protocol attack, which enables an attacker to learn the VPN session key shared between a victim client and a VPN endpoint. The attack recovers the key which is used to encrypt and authenticate VPN traffic. It leverages a weakness of the RADIUS protocol executed between a VPN endpoint and a RADIUS server, and allows an “insider” attacker to read the VPN traffic of ...
متن کاملHMAC-Based Authentication Protocol: Attacks and Improvements
As a response to a growing interest in RFID systems such as Internet of Things technology along with satisfying the security of these networks, proposing secure authentication protocols are indispensable part of the system design. Hence, authentication protocols to increase security and privacy in RFID applications have gained much attention in the literature. In this study, security and privac...
متن کاملGame-Based Cryptanalysis of a Lightweight CRC-Based Authentication Protocol for EPC Tags
The term "Internet of Things (IoT)" expresses a huge network of smart and connected objects which can interact with other devices without our interposition. Radio frequency identification (RFID) is a great technology and an interesting candidate to provide communications for IoT networks, but numerous security and privacy issues need to be considered. In this paper, we analyze the security and ...
متن کامل