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ssh-audit is a tool for ssh server & client configuration auditing.

jtesta/ssh-audit (v2.0+) is the updated and maintained version of ssh-audit forked from arthepsy/ssh-audit (v1.x) due to inactivity.

• Features
• Usage
• Screenshots
  • Server Standard Audit Example
  • Server Policy Audit Example
  • Client Standard Audit Example
• Hardening Guides
• Pre-Built Packages
• Web Front-End
• ChangeLog

• analyze SSH both server and client configuration;
• grab banner, recognize device or software and operating system, detect compression;
• gather key-exchange, host-key, encryption and message authentication code algorithms;
• output algorithm security information (available since, removed/disabled, unsafe/weak/legacy, etc);
• output algorithm recommendations (append or remove based on recognized software version);
• analyze SSH version compatibility based on algorithm information;
• historical information from OpenSSH, Dropbear SSH and libssh;
• policy scans to ensure adherence to a hardened/standard configuration;
• runs on Linux and Windows;
• supports Python 3.9 - 3.13;
• no dependencies

usage: ssh-audit.py [-h] [-4] [-6] [-b] [-c] [-d]
 [-g <min1:pref1:max1[,min2:pref2:max2,...]> / <x-y[:step]>]
 [-j] [-l {info,warn,fail}] [-L] [-M custom_policy.txt]
 [-m] [-n] [-P "Built-In Policy Name" / custom_policy.txt]
 [-p N] [-T targets.txt] [-t N] [-v]
 [--conn-rate-test N[:max_rate]] [--dheat N[:kex[:e_len]]]
 [--get-hardening-guide platform] [--list-hardening-guides]
 [--lookup alg1[,alg2,...]] [--skip-rate-test]
 [--threads N]
 [host]
# ssh-audit.py v3.4.0-dev, https://github.com/jtesta/ssh-audit
positional arguments:
 host target hostname or IPv4/IPv6 address
optional arguments:
 -h, --help show this help message and exit
 -4, --ipv4 enable IPv4 (order of precedence)
 -6, --ipv6 enable IPv6 (order of precedence)
 -b, --batch batch output
 -c, --client-audit starts a server on port 2222 to audit client software
 config (use -p to change port; use -t to change
 timeout)
 -d, --debug enable debugging output
 -g <min1:pref1:max1[,min2:pref2:max2,...]> / <x-y[:step]>, --gex-test <min1:pref1:max1[,min2:pref2:max2,...]> / <x-y[:step]>
 conducts a very customized Diffie-Hellman GEX modulus
 size test. Tests an array of minimum, preferred, and
 maximum values, or a range of values with an optional
 incremental step amount
 -j, --json enable JSON output (use -jj to enable indentation for
 better readability)
 -l {info,warn,fail}, --level {info,warn,fail}
 minimum output level (default: info)
 -L, --list-policies list all the official, built-in policies. Combine with
 -v to view policy change logs
 -M custom_policy.txt, --make-policy custom_policy.txt
 creates a policy based on the target server (i.e.: the
 target server has the ideal configuration that other
 servers should adhere to), and stores it in the file
 path specified
 -m, --manual print the man page (Docker, PyPI, Snap, and Windows
 builds only)
 -n, --no-colors disable colors (automatic when the NO_COLOR
 environment variable is set)
 -P "Built-In Policy Name" / custom_policy.txt, --policy "Built-In Policy Name" / custom_policy.txt
 run a policy test using the specified policy (use -L
 to see built-in policies, or specify filesystem path
 to custom policy created by -M)
 -p N, --port N the TCP port to connect to (or to listen on when -c is
 used)
 -T targets.txt, --targets targets.txt
 a file containing a list of target hosts (one per
 line, format HOST[:PORT]). Use -p/--port to set the
 default port for all hosts. Use --threads to control
 concurrent scans
 -t N, --timeout N timeout (in seconds) for connection and reading
 (default: 5)
 -v, --verbose enable verbose output
 --conn-rate-test N[:max_rate]
 perform a connection rate test (useful for collecting
 metrics related to susceptibility of the DHEat vuln).
 Testing is conducted with N concurrent sockets with an
 optional maximum rate of connections per second
 --dheat N[:kex[:e_len]]
 continuously perform the DHEat DoS attack
 (CVE-2002-20001) against the target using N concurrent
 sockets. Optionally, a specific key exchange algorithm
 can be specified instead of allowing it to be
 automatically chosen. Additionally, a small length of
 the fake e value sent to the server can be chosen for
 a more efficient attack (such as 4).
 --get-hardening-guide platform
 retrieves the hardening guide for the specified
 platform name (use --list-hardening-guides to see list
 of available guides).
 --list-hardening-guides
 list all official, built-in hardening guides for
 common systems. Their full names can then be passed to
 --get-hardening-guide. Add -v to this option to view
 hardening guide change logs and prior versions.
 --lookup alg1[,alg2,...]
 looks up an algorithm(s) without connecting to a
 server.
 --skip-rate-test skip the connection rate test during standard audits
 (used to safely infer whether the DHEat attack is
 viable)
 --threads N number of threads to use when scanning multiple
 targets (-T/--targets) (default: 32)

• if both IPv4 and IPv6 are used, order of precedence can be set by using either -46 or -64.
• batch flag -b will output sections without header and without empty lines (implies verbose flag).
• verbose flag -v will prefix each line with section type and algorithm name.
• an exit code of 0 is returned when all algorithms are considered secure (for a standard audit), or when a policy check passes (for a policy audit).

Basic server auditing:

ssh-audit localhost
ssh-audit 127.0.0.1
ssh-audit 127.0.0.1:222
ssh-audit ::1
ssh-audit [::1]:222

To run a standard audit against many servers (place targets into servers.txt, one on each line in the format of HOST[:PORT]):

ssh-audit -T servers.txt

To audit a client configuration (listens on port 2222 by default; connect using ssh -p 2222 anything@localhost):

ssh-audit -c

To audit a client configuration, with a listener on port 4567:

ssh-audit -c -p 4567

To list all official built-in policies (hint: use resulting policy names with -P/--policy):

ssh-audit -L

To run a policy audit against a server:

ssh-audit -P ["policy name" | path/to/server_policy.txt] targetserver

To run a policy audit against a client:

ssh-audit -c -P ["policy name" | path/to/client_policy.txt]

To run a policy audit against many servers:

ssh-audit -T servers.txt -P ["policy name" | path/to/server_policy.txt]

To create a policy based on a target server (which can be manually edited):

ssh-audit -M new_policy.txt targetserver

To run the DHEat CPU exhaustion DoS attack (CVE-2002-20001) against a target using 10 concurrent sockets:

ssh-audit --dheat=10 targetserver

To run the DHEat attack using the diffie-hellman-group-exchange-sha256 key exchange algorithm:

ssh-audit --dheat=10:diffie-hellman-group-exchange-sha256 targetserver

To run the DHEat attack using the diffie-hellman-group-exchange-sha256 key exchange algorithm along with very small but non-standard packet lengths (this may result in the same CPU exhaustion, but with many less bytes per second being sent):

ssh-audit --dheat=10:diffie-hellman-group-exchange-sha256:4 targetserver

Below is a screen shot of the standard server-auditing output when connecting to an unhardened OpenSSH v5.3 service: screenshot

Below is a screen shot of the policy auditing output when connecting to an un-hardened Ubuntu Server 20.04 machine (hint: use -L/--list-policies to see names of built-in policies to use with -P/--policy): screenshot

After applying the steps in the hardening guide (see below), the output changes to the following: screenshot

Below is a screen shot of the client-auditing output when an unhardened OpenSSH v7.2 client connects: client_screenshot

Guides to harden server & client configuration are built into the tool (see --list-hardening-guides and --get-hardening-guide options). Additionally, they are also available online at: https://www.ssh-audit.com/hardening_guides.html

Pre-built packages are available for Windows (see the Releases page), PyPI, Snap, and Docker:

To install from PyPI:

$ pip3 install ssh-audit

To install the Snap package:

$ snap install ssh-audit

To install from Dockerhub:

$ docker pull positronsecurity/ssh-audit

(Then run with: docker run -it --rm -p 2222:2222 positronsecurity/ssh-audit 10.1.1.1)

The status of various other platform packages can be found below (via Repology):

Packaging status

For convenience, a web front-end on top of the command-line tool is available at https://www.ssh-audit.com/.

• BIG THANKS to realmiwi for being the project's very first sponsor!!
• Dropped support for Python 3.8, as it reached end-of-life in October 2024.
• Added warning to all key exchanges that do not include protections against quantum attacks due to the Harvest Now, Decrypt Later strategy (see https://en.wikipedia.org/wiki/Harvest_now,_decrypt_later).
• Removed SSHv1 support (rationale is documented in: #298).
• Added hardening guides (see --list-hardening-guides and --get-hardening-guide). Previously, they were only available at https://ssh-audit.com/hardening_guides.html, but now they are built-in for convenience; partial credit oam7575.
• Added allow_hostkey_subset_and_reordering policy option to allow targets to have a more stringent list of host keys and/or a different ordering of them.
• Migrated from deprecated getopt module to argparse; partial credit oam7575.
• When running against multiple hosts, now prints each target host regardless of output level.
• Batch mode (-b) no longer automatically enables verbose mode, due to sometimes confusing results; users can still explicitly enable verbose mode using the -v flag.
• Added built-in policy for OpenSSH 10.0.
• Added hardening guides and policies for Debian 13.
• Added 2 new key exchanges: mlkem768nistp256-sha256, mlkem1024nistp384-sha384.
• Added 2 new ciphers: AEAD_CAMELLIA_128_GCM, AEAD_CAMELLIA_256_GCM.

• Added Python 3.13 support.
• Added built-in policies for Ubuntu 24.04 LTS server & client, OpenSSH 9.8, and OpenSSH 9.9.
• Added IPv6 support for DHEat and connection rate tests.
• Added TCP port information to JSON policy scan results; credit Fabian Malte Kopp.
• Added LANcom LCOS server recognition and Ed448 key extraction; credit Daniel Lenski.
• Now reports ECDSA and DSS fingerprints when in verbose mode; partial credit Daniel Lenski.
• Removed CVE information based on server/client version numbers, as this was wildly inaccurate (see this thread for the full discussion, as well as the results of the community vote on this matter).
• Fixed crash when running with -P and -T options simultaneously.
• Fixed host key tests from only reporting a key type at most once despite multiple hosts supporting it; credit Daniel Lenski.
• Fixed DHEat connection rate testing on MacOS X and BSD platforms; credit Drew Noel and Michael Osipov.
• Fixed invalid JSON output when a socket error occurs while performing a client audit.
• Fixed --conn-rate-test feature on Windows.
• When scanning multiple targets (using -T/--targets), the -p/--port option will now be used as the default port (set to 22 if -p/--port is not given). Hosts specified in the file can override this default with an explicit port number (i.e.: "host1:1234"). For example, when using -T targets.txt -p 222, all hosts in targets.txt that do not explicitly include a port number will default to 222; when using -T targets.txt (without -p), all hosts will use a default of 22.
• Updated built-in server & client policies for Amazon Linux 2023, Debian 12, Rocky Linux 9, and Ubuntu 22.04 to improve host key efficiency and cipher resistance to quantum attacks.
• Added 1 new cipher: grasshopper-ctr128.
• Added 2 new key exchanges: mlkem768x25519-sha256, sntrup761x25519-sha512.

• Added implementation of the DHEat denial-of-service attack (see --dheat option; CVE-2002-20001).
• Expanded filter of CBC ciphers to flag for the Terrapin vulnerability. It now includes more rarely found ciphers.
• Fixed parsing of ecdsa-sha2-nistp* CA signatures on host keys. Additionally, they are now flagged as potentially back-doored, just as standard host keys are.
• Gracefully handle rare exceptions (i.e.: crashes) while performing GEX tests.
• The built-in man page (-m, --manual) is now available on Docker, PyPI, and Snap builds, in addition to the Windows build.
• Snap builds are now architecture-independent.
• Changed Docker base image from python:3-slim to python:3-alpine, resulting in a 59% reduction in image size; credit Daniel Thamdrup.
• Added built-in policies for Amazon Linux 2023, Debian 12, OpenSSH 9.7, and Rocky Linux 9.
• Built-in policies now include a change log (use -L -v to view them).
• Custom policies now support the allow_algorithm_subset_and_reordering directive to allow targets to pass with a subset and/or re-ordered list of host keys, kex, ciphers, and MACs. This allows for the creation of a baseline policy where targets can optionally implement stricter controls; partial credit yannik1015.
• Custom policies now support the allow_larger_keys directive to allow targets to pass with larger host keys, CA keys, and Diffie-Hellman keys. This allows for the creation of a baseline policy where targets can optionally implement stricter controls; partial credit Damian Szuberski.
• Color output is disabled if the NO_COLOR environment variable is set (see https://no-color.org/).
• Added 1 new key exchange algorithm: gss-nistp384-sha384-*.
• Added 1 new cipher: aes128-ocb@libassh.org.

• Added test for the Terrapin message prefix truncation vulnerability (CVE-2023-48795).
• Dropped support for Python 3.7 (EOL was reached in June 2023).
• Added Python 3.12 support.
• In server policies, reduced expected DH modulus sizes from 4096 to 3072 to match the online hardening guides (note that 3072-bit moduli provide the equivalent of 128-bit symmetric security).
• In Ubuntu 22.04 client policy, moved host key types sk-ssh-ed25519@openssh.com and ssh-ed25519 to the end of all certificate types.
• Updated Ubuntu Server & Client policies for 20.04 and 22.04 to account for key exchange list changes due to Terrapin vulnerability patches.
• Re-organized option host key types for OpenSSH 9.2 server policy to correspond with updated Debian 12 hardening guide.
• Added built-in policies for OpenSSH 9.5 and 9.6.
• Added an additional_notes field to the JSON output.

• Results from concurrent scans against multiple hosts are no longer improperly combined; bug discovered by Adam Russell.
• Hostname resolution failure no longer causes scans against multiple hosts to terminate unexpectedly; credit Dani Cuesta.
• Algorithm recommendations resulting from warnings are now printed in yellow instead of red; credit Adam Russell.
• Added failure, warning, and info notes to JSON output (note that this results in a breaking change to the banner protocol, "enc", and "mac" fields); credit Bareq Al-Azzawi.
• Docker Makefile now creates multi-arch builds for amd64, arm64, and armv7; credit Sebastian Cohnen.
• Fixed crash during GEX tests.
• Refined GEX testing against OpenSSH servers: when the fallback mechanism is suspected of being triggered, perform an additional test to obtain more accurate results.
• The color of all notes will be printed in green when the related algorithm is rated good.
• Prioritized host key certificate algorithms for Ubuntu 22.04 LTS client policy.
• Marked all NIST K-, B-, and T-curves as unproven since they are so rarely used.
• Added built-in policy for OpenSSH 9.4.
• Added 12 new host keys: ecdsa-sha2-curve25519, ecdsa-sha2-nistb233, ecdsa-sha2-nistb409, ecdsa-sha2-nistk163, ecdsa-sha2-nistk233, ecdsa-sha2-nistk283, ecdsa-sha2-nistk409, ecdsa-sha2-nistp224, ecdsa-sha2-nistp192, ecdsa-sha2-nistt571, ssh-dsa, x509v3-sign-rsa-sha256.
• Added 15 new key exchanges: curve448-sha512@libssh.org, ecdh-nistp256-kyber-512r3-sha256-d00@openquantumsafe.org, ecdh-nistp384-kyber-768r3-sha384-d00@openquantumsafe.org, ecdh-nistp521-kyber-1024r3-sha512-d00@openquantumsafe.org, ecdh-sha2-brainpoolp256r1@genua.de, ecdh-sha2-brainpoolp384r1@genua.de, ecdh-sha2-brainpoolp521r1@genua.de, kexAlgoDH14SHA1, kexAlgoDH1SHA1, kexAlgoECDH256, kexAlgoECDH384, kexAlgoECDH521, sm2kep-sha2-nistp256, x25519-kyber-512r3-sha256-d00@amazon.com, x25519-kyber512-sha512@aws.amazon.com.
• Added 8 new ciphers: aes192-gcm@openssh.com, cast128-12-cbc, cast128-12-cfb, cast128-12-ecb, cast128-12-ofb, des-cfb, des-ecb, des-ofb.
• Added 14 new MACs: cbcmac-3des, cbcmac-aes, cbcmac-blowfish, cbcmac-des, cbcmac-rijndael, cbcmac-twofish, hmac-sha256-96, md5, md5-8, ripemd160, ripemd160-8, sha1, sha1-8, umac-128.

• Dropped support for Python 3.6, as it reached EOL at the end of 2021.
• Added Ubuntu Server & Client 22.04 hardening policies.
• Removed experimental warning tag from sntrup761x25519-sha512@openssh.com.
• Updated CVE database; credit Alexandre Zanni.
• Added -g and --gex-test for granular GEX modulus size tests; credit Adam Russell.
• Snap packages now print more user-friendly error messages when permission errors are encountered.
• JSON 'target' field now always includes port number; credit tomatohater1337.
• JSON output now includes recommendations and CVE data.
• Mixed host key/CA key types (i.e.: RSA host keys signed with ED25519 CAs, etc.) are now properly handled.
• Warnings are now printed for 2048-bit moduli; partial credit Adam Russell.
• SHA-1 algorithms now cause failures.
• CBC mode ciphers are now warnings instead of failures.
• Generic failure/warning messages replaced with more specific reasons (i.e.: 'using weak cipher' => 'using broken RC4 cipher').
• Updated built-in policies to include missing host key size information.
• Added built-in policies for OpenSSH 8.8, 8.9, 9.0, 9.1, 9.2, and 9.3.
• Added 33 new host keys: dsa2048-sha224@libassh.org, dsa2048-sha256@libassh.org, dsa3072-sha256@libassh.org, ecdsa-sha2-1.3.132.0.10-cert-v01@openssh.com, eddsa-e382-shake256@libassh.org, eddsa-e521-shake256@libassh.org, null, pgp-sign-dss, pgp-sign-rsa, spki-sign-dss, spki-sign-rsa, ssh-dss-sha224@ssh.com, ssh-dss-sha384@ssh.com, ssh-dss-sha512@ssh.com, ssh-ed448-cert-v01@openssh.com, ssh-rsa-sha224@ssh.com, ssh-rsa-sha2-256, ssh-rsa-sha2-512, ssh-rsa-sha384@ssh.com, ssh-rsa-sha512@ssh.com, ssh-xmss-cert-v01@openssh.com, ssh-xmss@openssh.com, webauthn-sk-ecdsa-sha2-nistp256@openssh.com, x509v3-ecdsa-sha2-1.3.132.0.10, x509v3-sign-dss-sha1, x509v3-sign-dss-sha224@ssh.com, x509v3-sign-dss-sha256@ssh.com, x509v3-sign-dss-sha384@ssh.com, x509v3-sign-dss-sha512@ssh.com, x509v3-sign-rsa-sha1, x509v3-sign-rsa-sha224@ssh.com, x509v3-sign-rsa-sha384@ssh.com, x509v3-sign-rsa-sha512@ssh.com.
• Added 46 new key exchanges: diffie-hellman-group14-sha224@ssh.com, diffie-hellman_group17-sha512, diffie-hellman-group-exchange-sha224@ssh.com, diffie-hellman-group-exchange-sha384@ssh.com, ecdh-sha2-1.2.840.10045.3.1.1, ecdh-sha2-1.2.840.10045.3.1.7, ecdh-sha2-1.3.132.0.1, ecdh-sha2-1.3.132.0.16, ecdh-sha2-1.3.132.0.26, ecdh-sha2-1.3.132.0.27, ecdh-sha2-1.3.132.0.33, ecdh-sha2-1.3.132.0.34, ecdh-sha2-1.3.132.0.35, ecdh-sha2-1.3.132.0.36, ecdh-sha2-1.3.132.0.37, ecdh-sha2-1.3.132.0.38, ecdh-sha2-4MHB+NBt3AlaSRQ7MnB4cg==, ecdh-sha2-5pPrSUQtIaTjUSt5VZNBjg==, ecdh-sha2-9UzNcgwTlEnSCECZa7V1mw==, ecdh-sha2-D3FefCjYoJ/kfXgAyLddYA==, ecdh-sha2-h/SsxnLCtRBh7I9ATyeB3A==, ecdh-sha2-m/FtSAmrV4j/Wy6RVUaK7A==, ecdh-sha2-mNVwCXAoS1HGmHpLvBC94w==, ecdh-sha2-qCbG5Cn/jjsZ7nBeR7EnOA==, ecdh-sha2-qcFQaMAMGhTziMT0z+Tuzw==, ecdh-sha2-VqBg4QRPjxx1EXZdV0GdWQ==, ecdh-sha2-wiRIU8TKjMZ418sMqlqtvQ==, ecdh-sha2-zD/b3hu/71952ArpUG4OjQ==, ecmqv-sha2, gss-13.3.132.0.10-sha256-*, gss-curve25519-sha256-*, gss-curve448-sha512-*, gss-gex-sha1-*, gss-gex-sha256-*, gss-group14-sha1-*, gss-group14-sha256-*, gss-group15-sha512-*, gss-group16-sha512-*, gss-group17-sha512-*, gss-group18-sha512-*, gss-group1-sha1-*, gss-nistp256-sha256-*, gss-nistp384-sha256-*, gss-nistp521-sha512-*, m383-sha384@libassh.org, m511-sha512@libassh.org.
• Added 28 new ciphers: 3des-cfb, 3des-ecb, 3des-ofb, blowfish-cfb, blowfish-ecb, blowfish-ofb, camellia128-cbc@openssh.org, camellia128-ctr@openssh.org, camellia192-cbc@openssh.org, camellia192-ctr@openssh.org, camellia256-cbc@openssh.org, camellia256-ctr@openssh.org, cast128-cfb, cast128-ecb, cast128-ofb, cast128-12-cbc@ssh.com, idea-cfb, idea-ecb, idea-ofb, rijndael-cbc@ssh.com, seed-ctr@ssh.com, serpent128-gcm@libassh.org, serpent256-gcm@libassh.org, twofish128-gcm@libassh.org, twofish256-gcm@libassh.org, twofish-cfb, twofish-ecb, twofish-ofb
• Added 5 new MACs: hmac-sha1-96@openssh.com, hmac-sha224@ssh.com, hmac-sha256-2@ssh.com, hmac-sha384@ssh.com, hmac-whirlpool.

• Fixed crash when running host key tests.
• Handles server connection failures more gracefully.
• Now prints JSON with indents when -jj is used (useful for debugging).
• Added MD5 fingerprints to verbose output.
• Added -d/--debug option for getting debugging output; credit Adam Russell.
• Updated JSON output to include MD5 fingerprints. Note that this results in a breaking change in the 'fingerprints' dictionary format.
• Updated OpenSSH 8.1 (and earlier) policies to include rsa-sha2-512 and rsa-sha2-256.
• Added OpenSSH v8.6 & v8.7 policies.
• Added 3 new key exchanges: gss-gex-sha1-eipGX3TCiQSrx573bT1o1Q==, gss-group1-sha1-eipGX3TCiQSrx573bT1o1Q==, and gss-group14-sha1-eipGX3TCiQSrx573bT1o1Q==.
• Added 3 new MACs: hmac-ripemd160-96, AEAD_AES_128_GCM, and AEAD_AES_256_GCM.

• Added multi-threaded scanning support.
• Added built-in Windows manual page (see -m/--manual); credit Adam Russell.
• Added version check for OpenSSH user enumeration (CVE-2018-15473).
• Added deprecation note to host key types based on SHA-1.
• Added extra warnings for SSHv1.
• Added built-in hardened OpenSSH v8.5 policy.
• Upgraded warnings to failures for host key types based on SHA-1.
• Fixed crash when receiving unexpected response during host key test.
• Fixed hang against older Cisco devices during host key test & gex test.
• Fixed improper termination while scanning multiple targets when one target returns an error.
• Dropped support for Python 3.5 (which reached EOL in Sept. 2020).
• Added 1 new key exchange: sntrup761x25519-sha512@openssh.com.

• Now parses public key sizes for rsa-sha2-256-cert-v01@openssh.com and rsa-sha2-512-cert-v01@openssh.com host key types.
• Flag ssh-rsa-cert-v01@openssh.com as a failure due to SHA-1 hash.
• Fixed bug in recommendation output which suppressed some algorithms inappropriately.
• Built-in policies now include CA key requirements (if certificates are in use).
• Lookup function (--lookup) now performs case-insensitive lookups of similar algorithms; credit Adam Russell.
• Migrated pre-made policies from external files to internal database.
• Split single 3,500 line script into many files (by class).
• Added setup.py support; credit Ganden Schaffner.
• Added 1 new cipher: des-cbc@ssh.com.

• Added new policy auditing functionality to test adherence to a hardening guide/standard configuration (see -L/--list-policies, -M/--make-policy and -P/--policy). For an in-depth tutorial, see https://www.positronsecurity.com/blog/2020-09-27-ssh-policy-configuration-checks-with-ssh-audit/.
• Created new man page (see ssh-audit.1 file).
• 1024-bit moduli upgraded from warnings to failures.
• Many Python 2 code clean-ups, testing framework improvements, pylint & flake8 fixes, and mypy type comments; credit Jürgen Gmach.
• Added feature to look up algorithms in internal database (see --lookup); credit Adam Russell.
• Suppress recommendation of token host key types.
• Added check for use-after-free vulnerability in PuTTY v0.73.
• Added 11 new host key types: ssh-rsa1, ssh-dss-sha256@ssh.com, ssh-gost2001, ssh-gost2012-256, ssh-gost2012-512, spki-sign-rsa, ssh-ed448, x509v3-ecdsa-sha2-nistp256, x509v3-ecdsa-sha2-nistp384, x509v3-ecdsa-sha2-nistp521, x509v3-rsa2048-sha256.
• Added 8 new key exchanges: diffie-hellman-group1-sha256, kexAlgoCurve25519SHA256, Curve25519SHA256, gss-group14-sha256-, gss-group15-sha512-, gss-group16-sha512-, gss-nistp256-sha256-, gss-curve25519-sha256-.
• Added 5 new ciphers: blowfish, AEAD_AES_128_GCM, AEAD_AES_256_GCM, crypticore128@ssh.com, seed-cbc@ssh.com.
• Added 3 new MACs: chacha20-poly1305@openssh.com, hmac-sha3-224, crypticore-mac@ssh.com.

• Marked host key type ssh-rsa as weak due to practical SHA-1 collisions.
• Added Windows builds.
• Added 10 new host key types: ecdsa-sha2-1.3.132.0.10, x509v3-sign-dss, x509v3-sign-rsa, x509v3-sign-rsa-sha256@ssh.com, x509v3-ssh-dss, x509v3-ssh-rsa, sk-ecdsa-sha2-nistp256-cert-v01@openssh.com, sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519-cert-v01@openssh.com, and sk-ssh-ed25519@openssh.com.
• Added 18 new key exchanges: diffie-hellman-group14-sha256@ssh.com, diffie-hellman-group15-sha256@ssh.com, diffie-hellman-group15-sha384@ssh.com, diffie-hellman-group16-sha384@ssh.com, diffie-hellman-group16-sha512@ssh.com, diffie-hellman-group18-sha512@ssh.com, ecdh-sha2-curve25519, ecdh-sha2-nistb233, ecdh-sha2-nistb409, ecdh-sha2-nistk163, ecdh-sha2-nistk233, ecdh-sha2-nistk283, ecdh-sha2-nistk409, ecdh-sha2-nistp192, ecdh-sha2-nistp224, ecdh-sha2-nistt571, gss-gex-sha1-, and gss-group1-sha1-.
• Added 9 new ciphers: camellia128-cbc, camellia128-ctr, camellia192-cbc, camellia192-ctr, camellia256-cbc, camellia256-ctr, aes128-gcm, aes256-gcm, and chacha20-poly1305.
• Added 2 new MACs: aes128-gcm and aes256-gcm.

• Added 2 new host key types: rsa-sha2-256-cert-v01@openssh.com, rsa-sha2-512-cert-v01@openssh.com.
• Added 2 new ciphers: des, 3des.
• Added 3 new PuTTY vulnerabilities.
• During client testing, client IP address is now listed in output.

• Added client software auditing functionality (see -c / --client-audit option).
• Added JSON output option (see -j / --json option; credit Andreas Jaggi).
• Fixed crash while scanning Solaris Sun_SSH.
• Added 9 new key exchanges: gss-group1-sha1-toWM5Slw5Ew8Mqkay+al2g==, gss-gex-sha1-toWM5Slw5Ew8Mqkay+al2g==, gss-group14-sha1-, gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==, gss-group14-sha256-toWM5Slw5Ew8Mqkay+al2g==, gss-group15-sha512-toWM5Slw5Ew8Mqkay+al2g==, diffie-hellman-group15-sha256, ecdh-sha2-1.3.132.0.10, curve448-sha512.
• Added 1 new host key type: ecdsa-sha2-1.3.132.0.10.
• Added 4 new ciphers: idea-cbc, serpent128-cbc, serpent192-cbc, serpent256-cbc.
• Added 6 new MACs: hmac-sha2-256-96-etm@openssh.com, hmac-sha2-512-96-etm@openssh.com, hmac-ripemd, hmac-sha256-96@ssh.com, umac-32@openssh.com, umac-96@openssh.com.

• Forked from https://github.com/arthepsy/ssh-audit (development was stalled, and developer went MIA).
• Added RSA host key length test.
• Added RSA certificate key length test.
• Added Diffie-Hellman modulus size test.
• Now outputs host key fingerprints for RSA and ED25519.
• Added 5 new key exchanges: sntrup4591761x25519-sha512@tinyssh.org, diffie-hellman-group-exchange-sha256@ssh.com, diffie-hellman-group-exchange-sha512@ssh.com, diffie-hellman-group16-sha256, diffie-hellman-group17-sha512.
• Added 3 new encryption algorithms: des-cbc-ssh1, blowfish-ctr, twofish-ctr.
• Added 10 new MACs: hmac-sha2-56, hmac-sha2-224, hmac-sha2-384, hmac-sha3-256, hmac-sha3-384, hmac-sha3-512, hmac-sha256, hmac-sha256@ssh.com, hmac-sha512, hmac-512@ssh.com.
• Added command line argument (-t / --timeout) for connection & reading timeouts.
• Updated CVEs for libssh & Dropbear.

• implement options to allow specify IPv4/IPv6 usage and order of precedence
• implement option to specify remote port (old behavior kept for compatibility)
• add colors support for Microsoft Windows via optional colorama dependency
• fix encoding and decoding issues, add tests, do not crash on encoding errors
• use mypy-lang for static type checking and verify all code

• implement algorithm recommendations section (based on recognized software)
• implement full libssh support (version history, algorithms, security, etc)
• fix SSH-1.99 banner recognition and version comparison functionality
• do not output empty algorithms (happens for misconfigured servers)
• make consistent output for Python 3.x versions
• add a lot more tests (conf, banner, software, SSH1/SSH2, output, etc)
• use Travis CI to test for multiple Python versions (2.6-3.5, pypy, pypy3)

• create security section for related security information
• match and output assigned CVE list and security issues for Dropbear SSH
• implement full SSH1 support with fingerprint information
• automatically fallback to SSH1 on protocol mismatch
• add new options to force SSH1 or SSH2 (both allowed by default)
• parse banner information and convert it to specific software and OS version
• do not use padding in batch mode
• several fixes (Cisco sshd, rare hangs, error handling, etc)

• implement batch output option
• implement minimum output level option
• fix compatibility with Python 2.6

• implement SSH version compatibility feature
• fix wrong mac algorithm warning
• fix Dropbear SSH version typo
• parse pre-banner header
• better errors handling

• use OpenSSH 7.3 banner
• add new key-exchange algorithms

• use OpenSSH 7.2 banner
• additional warnings for OpenSSH 7.2
• fix OpenSSH 7.0 failure messages
• add rijndael-cbc failure message from OpenSSH 6.7

• multiple additional warnings
• support for none algorithm
• better compression handling
• ensure reading enough data (fixes few Linux SSH)

• Dropbear SSH support

• initial version