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Bitvise SSH Client 9.31 download4/6/2024 ![]() Nearly a third of those addresses, 3.3 million, resided in the US, followed by China, Russia, Germany, Russia and Singapore. Internet-wide scans performed Tuesday, the last day such data was available at the time of reporting, revealed that more than 11 million IP addresses exposing an SSH server remained vulnerable to Terrapin. This prefix truncation attack works when implementations support either the "ChaCha20-Poly1305" or "CBC with Encrypt-then-MAC," cipher modes, which, at the time the paper was published, was found in 77 percent of SSH servers. It works by targeting BPP ( Binary Packet Protocol), which is designed to ensure AitMs can’t add or drop messages exchanged during the handshake. ![]() As such, Terrapin represents the first practical cryptographic attack targeting the integrity of the SSH protocol itself. ![]() In those instances, Terrapin allows attackers to alter or corrupt information transmitted in the SSH data stream during the handshake-the earliest connection stage, when the two parties negotiate the encryption parameters they will use to establish a secure connection. ![]() Tracked as CVE-2023-48795, the attack the researchers devised works when attackers have an adversary-in-the-middle attack (also abbreviated as AitM and known as man-in-the-middle or MitM), such as when they’re positioned on the same local network and can secretly intercept communications and assume the identity of both the recipient and the sender. It just got a lot weakerTerrapin, as the vulnerability has been named, came to light two weeks ago in a research paper published by academic researchers. Further Reading SSH protects the world’s most sensitive networks. ![]()
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