SSH servers survey in 2022

In 2022, I scanned ~250k random SSH hosts.

Most popular SSH server banners:

  44364 serv_banner: SSH-2.0-OpenSSH_7.4
  26942 serv_banner: SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2
  20928 serv_banner: SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.7
  20743 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.5
  15670 serv_banner: SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.5
  12189 serv_banner: SSH-2.0-OpenSSH_5.3
   9309 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.2
   8168 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.4
   7497 serv_banner: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.8
   7482 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.3
   7029 serv_banner: SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u7
   6746 serv_banner: SSH-2.0-OpenSSH_8.4p1 Debian-5+deb11u1
   6457 serv_banner: SSH-2.0-OpenSSH_8.0
   6281 serv_banner: SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
   5798 serv_banner: SSH-2.0-OpenSSH_8.9p1 Ubuntu-3
   5755 serv_banner: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.10
   2888 serv_banner: SSH-2.0-OpenSSH_8.4p1 Debian-5
   2446 serv_banner: SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.1
   2258 serv_banner: SSH-2.0-OpenSSH_6.7p1 Debian-5+deb8u8
   2238 serv_banner: SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.6
   1689 serv_banner: SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.13
   1627 serv_banner: SSH-2.0-OpenSSH_8.9
   1465 serv_banner: SSH-2.0-OpenSSH_9.0
   1116 serv_banner: SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u6
   1066 serv_banner: SSH-2.0-OpenSSH_6.6.1
    963 serv_banner: SSH-2.0-OpenSSH_7.9 FreeBSD-20200214
    889 serv_banner: SSH-2.0-OpenSSH_8.2p1
    784 serv_banner: SSH-2.0-OpenSSH_8.6
    761 serv_banner: SSH-2.0-OpenSSH_7.6p1
    739 serv_banner: SSH-2.0-OpenSSH_8.8
    680 serv_banner: SSH-2.0-OpenSSH_7.9p1
    663 serv_banner: SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.8
    616 serv_banner: SSH-2.0-OpenSSH_8.5
    566 serv_banner: SSH-2.0-OpenSSH_8.4p1
    542 serv_banner: SSH-2.0-OpenSSH_7.6p1 Ubuntu-4
    530 serv_banner: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.4
    448 serv_banner: SSH-2.0-OpenSSH_6.7p1 Debian-5+deb8u3
    405 serv_banner: SSH-2.0-OpenSSH_7.2p2
    390 serv_banner: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.1

KEX algorithms offered:

 242516 kex_algorithms: diffie-hellman-group-exchange-sha256
 228863 kex_algorithms: curve25519-sha256@libssh.org
 225829 kex_algorithms: ecdh-sha2-nistp256
 225687 kex_algorithms: ecdh-sha2-nistp384
 225587 kex_algorithms: ecdh-sha2-nistp521
 190201 kex_algorithms: diffie-hellman-group14-sha256
 190193 kex_algorithms: diffie-hellman-group16-sha512
 189987 kex_algorithms: diffie-hellman-group18-sha512
 183742 kex_algorithms: curve25519-sha256
 147229 kex_algorithms: diffie-hellman-group14-sha1
  59194 kex_algorithms: diffie-hellman-group-exchange-sha1
  53329 kex_algorithms: diffie-hellman-group1-sha1
   8969 kex_algorithms: sntrup761x25519-sha512@openssh.com
    354 kex_algorithms: diffie-hellman-group15-sha512
    271 kex_algorithms: ext-info-s
    119 kex_algorithms: diffie-hellman-group17-sha512
     89 kex_algorithms: gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==
     86 kex_algorithms: gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==
     82 kex_algorithms: sntrup4591761x25519-sha512@tinyssh.org
     80 kex_algorithms: curve448-sha512
     76 kex_algorithms: gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==
     56 kex_algorithms: ecdh-sha2-1.3.132.0.10
     35 kex_algorithms: sm2kep-sha2-nistp256
     23 kex_algorithms: gss-group14-sha256-toWM5Slw5Ew8Mqkay+al2g==
     18 kex_algorithms: rsa1024-sha1
     17 kex_algorithms: rsa2048-sha256
     17 kex_algorithms: gss-group15-sha512-toWM5Slw5Ew8Mqkay+al2g==
     15 kex_algorithms: gss-group14-sha1-
     15 kex_algorithms: gss-gex-sha1-
      6 kex_algorithms: gss-nistp256-sha256-toWM5Slw5Ew8Mqkay+al2g==
      6 kex_algorithms: gss-group16-sha512-toWM5Slw5Ew8Mqkay+al2g==
      6 kex_algorithms: gss-curve25519-sha256-toWM5Slw5Ew8Mqkay+al2g==
      4 kex_algorithms: gss-group1-sha1-

Server host algorithms offered:

 242939 server_host_algorithms: ssh-rsa
 226943 server_host_algorithms: rsa-sha2-256
 226712 server_host_algorithms: rsa-sha2-512
 219872 server_host_algorithms: ssh-ed25519
 219622 server_host_algorithms: ecdsa-sha2-nistp256
  28921 server_host_algorithms: ssh-dss
   4027 server_host_algorithms: ssh-rsa-cert-v01@openssh.com
    899 server_host_algorithms: ecdsa-sha2-nistp521
    848 server_host_algorithms: ssh-ed25519-cert-v01@openssh.com
    435 server_host_algorithms: rsa-sha2-512-cert-v01@openssh.com
    435 server_host_algorithms: rsa-sha2-256-cert-v01@openssh.com
    165 server_host_algorithms: ssh-rsa-sha256@ssh.com
     94 server_host_algorithms: ecdsa-sha2-nistp384
     63 server_host_algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com

MAC algorithms offered:

 249189 mac_algorithms: hmac-sha2-256
 248216 mac_algorithms: hmac-sha2-512
 229440 mac_algorithms: hmac-sha2-256-etm@openssh.com
 229080 mac_algorithms: hmac-sha2-512-etm@openssh.com
 225752 mac_algorithms: umac-128-etm@openssh.com
 223541 mac_algorithms: umac-128@openssh.com
 222549 mac_algorithms: hmac-sha1
 211784 mac_algorithms: umac-64@openssh.com
 209310 mac_algorithms: hmac-sha1-etm@openssh.com
 202309 mac_algorithms: umac-64-etm@openssh.com
  26895 mac_algorithms: hmac-ripemd160
  25546 mac_algorithms: hmac-ripemd160@openssh.com
  16434 mac_algorithms: hmac-sha1-96
  16233 mac_algorithms: hmac-md5
  15609 mac_algorithms: hmac-md5-96
   5578 mac_algorithms: hmac-sha1-96-etm@openssh.com
   5569 mac_algorithms: hmac-md5-etm@openssh.com
   5556 mac_algorithms: hmac-md5-96-etm@openssh.com
   5295 mac_algorithms: hmac-ripemd160-etm@openssh.com
   1433 mac_algorithms: hmac-sha2-256-96
   1377 mac_algorithms: hmac-sha2-512-96

Encryption algorithms offered:

 252229 encryption_algorithms: aes256-ctr
 251869 encryption_algorithms: aes128-ctr
 244078 encryption_algorithms: aes192-ctr
 222625 encryption_algorithms: aes128-gcm@openssh.com
 222599 encryption_algorithms: chacha20-poly1305@openssh.com
 222458 encryption_algorithms: aes256-gcm@openssh.com
  62487 encryption_algorithms: aes256-cbc
  62383 encryption_algorithms: aes128-cbc
  55496 encryption_algorithms: aes192-cbc
  55302 encryption_algorithms: 3des-cbc
  52355 encryption_algorithms: blowfish-cbc
  51794 encryption_algorithms: cast128-cbc
  17841 encryption_algorithms: rijndael-cbc@lysator.liu.se
  17445 encryption_algorithms: arcfour256
  17363 encryption_algorithms: arcfour128
  14864 encryption_algorithms: arcfour
    320 encryption_algorithms: 3des-ctr
    258 encryption_algorithms: twofish256-cbc
    258 encryption_algorithms: twofish128-cbc
    237 encryption_algorithms: twofish-cbc
    185 encryption_algorithms: twofish192-cbc
    171 encryption_algorithms: twofish256-ctr
    171 encryption_algorithms: twofish128-ctr
    168 encryption_algorithms: twofish192-ctr
    126 encryption_algorithms: none
    119 encryption_algorithms: des-cbc
    104 encryption_algorithms: AEAD_AES_128_GCM
     98 encryption_algorithms: AEAD_AES_256_GCM
     57 encryption_algorithms: rijndael256-cbc
     56 encryption_algorithms: blowfish-ctr
     55 encryption_algorithms: rijndael192-cbc
     55 encryption_algorithms: rijndael128-cbc
     47 encryption_algorithms: aes256-gcm
     47 encryption_algorithms: aes128-gcm
     11 encryption_algorithms: des
     10 encryption_algorithms: 3des

RSA modulus in case of RSA negotiation:

 180007 binlog(RSA_modulus_n): 2048
  65593 binlog(RSA_modulus_n): 3072
   2965 binlog(RSA_modulus_n): 4096
   1495 binlog(RSA_modulus_n): 1024

No, RSA GCD attack is not possible anymore. But even if you could factor SSH server's RSA key, you only could mount MITM attack. For logging into server, you still need to know login/password or have login/private key pair + corresponding public key on server in $HOME/.ssh/authorized_keys file.


My other blog posts about SSH protocol dissected: 1, 2, 3, 4.

(the post first published at 20221001.)


List of my other blog posts.

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