# general (gen) banner: SSH-2.0-OpenSSH_5.6 (gen) software: OpenSSH 5.6 (gen) compatibility: OpenSSH 5.6-6.6, Dropbear SSH 0.53+ (some functionality from 0.52) (gen) compression: enabled (zlib@openssh.com) # security (cve) CVE-2018-15473 -- (CVSSv2: 5.3) enumerate usernames due to timing discrepencies (cve) CVE-2016-3115 -- (CVSSv2: 5.5) bypass command restrictions via crafted X11 forwarding data (cve) CVE-2016-1907 -- (CVSSv2: 5.0) cause DoS via crafted network traffic (out of bounds read) (cve) CVE-2015-6564 -- (CVSSv2: 6.9) privilege escalation via leveraging sshd uid (cve) CVE-2015-6563 -- (CVSSv2: 1.9) conduct impersonation attack (cve) CVE-2014-2532 -- (CVSSv2: 5.8) bypass environment restrictions via specific string before wildcard (cve) CVE-2014-1692 -- (CVSSv2: 7.5) cause DoS via triggering error condition (memory corruption) (cve) CVE-2012-0814 -- (CVSSv2: 3.5) leak data via debug messages (cve) CVE-2011-5000 -- (CVSSv2: 3.5) cause DoS via large value in certain length field (memory consumption) (cve) CVE-2010-5107 -- (CVSSv2: 5.0) cause DoS via large number of connections (slot exhaustion) (cve) CVE-2010-4755 -- (CVSSv2: 4.0) cause DoS via crafted glob expression (CPU and memory consumption) (cve) CVE-2010-4478 -- (CVSSv2: 7.5) bypass authentication check via crafted values # key exchange algorithms (kex) diffie-hellman-group-exchange-sha256 (1024-bit) -- [fail] using small 1024-bit modulus `- [info] available since OpenSSH 4.4 (kex) diffie-hellman-group-exchange-sha1 (1024-bit) -- [fail] using small 1024-bit modulus  `- [warn] using weak hashing algorithm `- [info] available since OpenSSH 2.3.0 (kex) diffie-hellman-group14-sha1 -- [warn] using weak hashing algorithm `- [info] available since OpenSSH 3.9, Dropbear SSH 0.53 (kex) diffie-hellman-group1-sha1 -- [fail] using small 1024-bit modulus  `- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [fail] disabled (in client) since OpenSSH 7.0, logjam attack  `- [warn] using weak hashing algorithm `- [info] available since OpenSSH 2.3.0, Dropbear SSH 0.28 # host-key algorithms (key) ssh-rsa (3072-bit) -- [fail] using weak hashing algorithm `- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.28 `- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2 (key) ssh-rsa-cert-v01@openssh.com (3072-bit cert/1024-bit CA) -- [fail] using weak hashing algorithm  `- [fail] using small 1024-bit modulus `- [info] available since OpenSSH 5.6 `- [info] a future deprecation notice has been issued in OpenSSH 8.2: https://www.openssh.com/txt/release-8.2 # encryption algorithms (ciphers) (enc) aes128-ctr -- [info] available since OpenSSH 3.7, Dropbear SSH 0.52 (enc) aes192-ctr -- [info] available since OpenSSH 3.7 (enc) aes256-ctr -- [info] available since OpenSSH 3.7, Dropbear SSH 0.52 (enc) arcfour256 -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using weak cipher `- [info] available since OpenSSH 4.2 (enc) arcfour128 -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using weak cipher `- [info] available since OpenSSH 4.2 (enc) aes128-cbc -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] using weak cipher mode `- [info] available since OpenSSH 2.3.0, Dropbear SSH 0.28 (enc) 3des-cbc -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.4, unsafe algorithm  `- [warn] using weak cipher  `- [warn] using weak cipher mode  `- [warn] using small 64-bit block size `- [info] available since OpenSSH 1.2.2, Dropbear SSH 0.28 (enc) blowfish-cbc -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [fail] disabled since Dropbear SSH 0.53  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using weak cipher mode  `- [warn] using small 64-bit block size `- [info] available since OpenSSH 1.2.2, Dropbear SSH 0.28 (enc) cast128-cbc -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using weak cipher mode  `- [warn] using small 64-bit block size `- [info] available since OpenSSH 2.1.0 (enc) aes192-cbc -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] using weak cipher mode `- [info] available since OpenSSH 2.3.0 (enc) aes256-cbc -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] using weak cipher mode `- [info] available since OpenSSH 2.3.0, Dropbear SSH 0.47 (enc) arcfour -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using weak cipher `- [info] available since OpenSSH 2.1.0 (enc) rijndael-cbc@lysator.liu.se -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using weak cipher mode `- [info] available since OpenSSH 2.3.0 # message authentication code algorithms (mac) hmac-md5 -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using encrypt-and-MAC mode  `- [warn] using weak hashing algorithm `- [info] available since OpenSSH 2.1.0, Dropbear SSH 0.28 (mac) hmac-sha1 -- [warn] using encrypt-and-MAC mode  `- [warn] using weak hashing algorithm `- [info] available since OpenSSH 2.1.0, Dropbear SSH 0.28 (mac) umac-64@openssh.com -- [warn] using encrypt-and-MAC mode  `- [warn] using small 64-bit tag size `- [info] available since OpenSSH 4.7 (mac) hmac-ripemd160 -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using encrypt-and-MAC mode `- [info] available since OpenSSH 2.5.0 (mac) hmac-ripemd160@openssh.com -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using encrypt-and-MAC mode `- [info] available since OpenSSH 2.1.0 (mac) hmac-sha1-96 -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using encrypt-and-MAC mode  `- [warn] using weak hashing algorithm `- [info] available since OpenSSH 2.5.0, Dropbear SSH 0.47 (mac) hmac-md5-96 -- [fail] removed (in server) since OpenSSH 6.7, unsafe algorithm  `- [warn] disabled (in client) since OpenSSH 7.2, legacy algorithm  `- [warn] using encrypt-and-MAC mode  `- [warn] using weak hashing algorithm `- [info] available since OpenSSH 2.5.0 # fingerprints (fin) ssh-rsa: SHA256:nsWtdJ9Z67Vrf7OsUzQov7esXhsWAfVppArGh25u244 # algorithm recommendations (for OpenSSH 5.6) (rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 2048 bits or larger)  (rec) -3des-cbc -- enc algorithm to remove  (rec) -aes128-cbc -- enc algorithm to remove  (rec) -aes192-cbc -- enc algorithm to remove  (rec) -aes256-cbc -- enc algorithm to remove  (rec) -arcfour -- enc algorithm to remove  (rec) -arcfour128 -- enc algorithm to remove  (rec) -arcfour256 -- enc algorithm to remove  (rec) -blowfish-cbc -- enc algorithm to remove  (rec) -cast128-cbc -- enc algorithm to remove  (rec) -diffie-hellman-group-exchange-sha1 -- kex algorithm to remove  (rec) -diffie-hellman-group1-sha1 -- kex algorithm to remove  (rec) -hmac-md5 -- mac algorithm to remove  (rec) -hmac-md5-96 -- mac algorithm to remove  (rec) -hmac-ripemd160 -- mac algorithm to remove  (rec) -hmac-ripemd160@openssh.com -- mac algorithm to remove  (rec) -hmac-sha1-96 -- mac algorithm to remove  (rec) -rijndael-cbc@lysator.liu.se -- enc algorithm to remove  (rec) -ssh-rsa -- key algorithm to remove  (rec) -ssh-rsa-cert-v01@openssh.com -- key algorithm to remove  (rec) -diffie-hellman-group14-sha1 -- kex algorithm to remove  (rec) -hmac-sha1 -- mac algorithm to remove  (rec) -umac-64@openssh.com -- mac algorithm to remove  # additional info (nfo) For hardening guides on common OSes, please see: