Terrapin Attack🔒 SSL Verified

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"SSH is an internet standard that provides secure access to network services, particularly remote terminal login and file transfer within organizational networks and to over 15 million servers on the open internet."

"Terrapin is a prefix truncation attack targeting the SSH protocol. More precisely, Terrapin breaks the integrity of SSH's secure channel. By carefully adjusting the sequence numbers during the handshake, an attacker can remove an arbitrary amount of messages sent by the client or server at the beginning of the secure channel without the client or server noticing it."

"The attack can be performed in practice, allowing an attacker to downgrade the connection's security by truncating the extension negotiation message (RFC8308) from the transcript. The truncation can lead to using less secure client authentication algorithms and deactivating specific countermeasures against keystroke timing attacks in OpenSSH 9.5."

"We also showed that Terrapin can be used to enable the exploitation of implementation flaws. For example, we found several weaknesses in the AsyncSSH servers' state machine, allowing an attacker to sign a victim's client into another account without the victim noticing. Hence, it will enable strong phishing attacks and may grant the attacker Man-in-the-Middle (MitM) capabilities within the encrypted session."

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News

Introduction

Attack Overview

Full Technical Paper

Vulnerability Scanner

FAQ