The channel window adjust message of the SSH protocol is used to track the free space in the receive buffer of the other side of a channel. The current implementation takes the value from the message and adds it to an internal state value. This can result in a integer overflow. If the Rust code is compiled with overflow checks, it will panic. A malicious client can crash a server.
Allocating an untrusted amount of memory allows any unauthenticated user to OOM a russh server.
Allocating an untrusted amount of memory allows any unauthenticated user to OOM a russh server.
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.
Diffie-Hellman key validation is insufficient, which can lead to insecure shared secrets and therefore breaks confidentiality.