Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Eugeny / russh | affected < 0.62.4 |
CWE
CWE-754
References
- https://github.com/Eugeny/russh/security/advisories/GHSA-5xvq-cp9x-6p6r
- https://github.com/Eugeny/russh/commit/a7fc1eb5717264e31c3c5f7dd849b73989a08f3d
- https://github.com/Eugeny/russh/releases/tag/v0.62.4
ADP enrichment
No English description supplied.
No references supplied.