Security Bulletin: IBM MQ Appliance vulnerable to "Terrapin" attack in OpenSSH (CVE-2023-48795)

Summary By manipulating sequence numbers during SSH connection setup, a MITM attacker can delete negotiation messages without causing a MAC failure. To mitigate this vulnerability, IBM MQ Appliance has removed the chacha20-poly1305 cipher and all etm HMACs from the default set of algorithms...

ssh: Prefix truncation attack on Binary Packet Protocol (BPP)

A flaw was found in the SSH channel integrity. By manipulating sequence numbers during the handshake, an attacker can remove the initial messages on the secure channel without causing a MAC failure. For example, an attacker could disable the ping extension and thus disable the new countermeasure ...

CLSA-2024-1707420183 Fix CVE(s): CVE-2023-48795

SECURITY UPDATE: it's possible to remove the initial messages on the secure channel without causing a MAC failure - debian/patches/CVE-2023-48795.patch: implement "strict key exchange" in ssh and sshd - CVE-2023-48795...