Protocols

VPN protocols differ sharply in their weaknesses: IPsec/IKE exposes aggressive-mode PSK disclosure, OpenVPN's security rests on configuration and key handling, PPTP's MS-CHAPv2 is cryptographically broken, WireGuard is sound but leaks through static-key management, and L2TP and SSTP inherit IPsec-PSK and TLS weaknesses respectively. The protocol in use dictates the attack.

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VPNs run over different protocols, and each carries its own characteristic weaknesses, so identifying the protocol selects the attack. IPsec with IKE exposes aggressive-mode pre-shared-key hash disclosure and transform weaknesses. OpenVPN is cryptographically solid but its security depends entirely on configuration and key/certificate handling. PPTP is obsolete and its MS-CHAPv2 authentication is effectively broken. WireGuard's protocol is sound, so the attack shifts to its static-key management and identity exposure. And L2TP and SSTP inherit the weaknesses of what wraps them, an IPsec pre-shared key and TLS respectively.

Subtopics#

  • IPsec IKE: aggressive-mode PSK disclosure and IKE weaknesses.
  • OpenVPN: configuration, credential, and key-handling attacks.
  • PPTP: the broken MS-CHAPv2 authentication.
  • WireGuard: static-key management and identity exposure.
  • L2TP and SSTP: inherited IPsec-PSK and TLS weaknesses.

References#

IliyotanguliaProtocol detectionInayofuata IPsec IKE