| id: GO-2023-2402 |
| modules: |
| - module: golang.org/x/crypto |
| versions: |
| - fixed: 0.17.0 |
| vulnerable_at: 0.16.0 |
| packages: |
| - package: golang.org/x/crypto/ssh |
| symbols: |
| - handshakeTransport.readLoop |
| - handshakeTransport.sendKexInit |
| - handshakeTransport.enterKeyExchange |
| - transport.readPacket |
| - connectionState.readPacket |
| - transport.writePacket |
| - connectionState.writePacket |
| derived_symbols: |
| - Client.Dial |
| - Client.DialContext |
| - Client.DialTCP |
| - Client.Listen |
| - Client.ListenTCP |
| - Client.ListenUnix |
| - Client.NewSession |
| - Dial |
| - DiscardRequests |
| - NewClient |
| - NewClientConn |
| - NewServerConn |
| - Request.Reply |
| - Session.Close |
| - Session.CombinedOutput |
| - Session.Output |
| - Session.RequestPty |
| - Session.RequestSubsystem |
| - Session.Run |
| - Session.SendRequest |
| - Session.Setenv |
| - Session.Shell |
| - Session.Signal |
| - Session.Start |
| - Session.WindowChange |
| - channel.Accept |
| - channel.Close |
| - channel.CloseWrite |
| - channel.Read |
| - channel.ReadExtended |
| - channel.Reject |
| - channel.SendRequest |
| - channel.Write |
| - channel.WriteExtended |
| - curve25519sha256.Client |
| - curve25519sha256.Server |
| - dhGEXSHA.Client |
| - dhGEXSHA.Server |
| - dhGroup.Client |
| - dhGroup.Server |
| - ecdh.Client |
| - ecdh.Server |
| - extChannel.Read |
| - extChannel.Write |
| - mux.OpenChannel |
| - mux.SendRequest |
| - sessionStdin.Close |
| - sshClientKeyboardInteractive.Challenge |
| - tcpListener.Accept |
| - tcpListener.Close |
| - unixListener.Accept |
| - unixListener.Close |
| summary: |- |
| Man-in-the-middle attacker can compromise integrity of secure channel in |
| golang.org/x/crypto |
| description: |- |
| A protocol weakness allows a MITM attacker to compromise the integrity of the |
| secure channel before it is established, allowing the attacker to prevent |
| transmission of a number of messages immediately after the secure channel is |
| established without either side being aware. |
| |
| The impact of this attack is relatively limited, as it does not compromise |
| confidentiality of the channel. Notably this attack would allow an attacker to |
| prevent the transmission of the SSH2_MSG_EXT_INFO message, disabling a handful |
| of newer security features. |
| |
| This protocol weakness was also fixed in OpenSSH 9.6. |
| cves: |
| - CVE-2023-48795 |
| ghsas: |
| - GHSA-45x7-px36-x8w8 |
| credits: |
| - Fabian Bäumer (Ruhr University Bochum) |
| - Marcus Brinkmann (Ruhr University Bochum) |
| - Jörg Schwenk (Ruhr University Bochum) |
| references: |
| - report: https://go.dev/issue/64784 |
| - fix: https://go.dev/cl/550715 |
| - fix: https://github.com/golang/crypto/commit/9d2ee975ef9fe627bf0a6f01c1f69e8ef1d4f05d |
| - web: https://groups.google.com/g/golang-announce/c/qA3XtxvMUyg |
| - web: https://www.openssh.com/txt/release-9.6 |
