CyberRota Analysis
AI-GeneratedThe vulnerability affects the Russh Rust SSH client and server library, allowing unauthenticated SSH clients to trigger a denial of service by sending a specific malformed message. This results in a server panic during the key exchange process, terminating the session before authentication can occur. Organizations using affected versions of the Russh library should prioritize upgrading to version 0.62.4 to mitigate this risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Russh is a Rust SSH client & server library. Prior to 0.62.4, an unauthenticated SSH client can cause a denial of service by sending SSH_MSG_KEX_ECDH_INIT with a 32-byte all-zero Q_C value. Curve25519Kex::server_dh in russh/src/kex/curve25519.rs accepts the all-zero peer public value and computes an all-zero shared secret, after which compute_exchange_hash calls encode_mpint in russh/src/kex/mod.rs and indexes beyond the end of the input while skipping leading zero bytes. The resulting panic occurs before authentication and terminates the server key-exchange task. This issue is fixed in version 0.62.4.