ssh-audit is a tool for ssh server & client configuration auditing.
- SSH1 and SSH2 protocol server support;
- analyze SSH 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 information (available since, removed/disabled, unsafe/weak/legacy, etc);
- output algorithm recommendations (append or remove based on recognized software version);
- output security information (related issues, assigned CVE list, etc);
- analyze SSH version compatibility based on algorithm information;
- historical information from OpenSSH, Dropbear SSH and libssh;
- no dependencies
usage: ssh-audit.py [-1246pbcnjvlt] <host>
-1, --ssh1 force ssh version 1 only
-2, --ssh2 force ssh version 2 only
-4, --ipv4 enable IPv4 (order of precedence)
-6, --ipv6 enable IPv6 (order of precedence)
-p, --port=<port> port to connect
-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)
-n, --no-colors disable colors
-j, --json JSON output
-v, --verbose verbose output
-l, --level=<level> minimum output level (info|warn|fail)
-t, --timeout=<secs> timeout (in seconds) for connection and reading
(default: 5)
- if both IPv4 and IPv6 are used, order of precedence can be set by using either
-46or-64. - batch flag
-bwill output sections without header and without empty lines (implies verbose flag). - verbose flag
-vwill prefix each line with section type and algorithm name.
Below is a screen shot of the server-auditing output when connecting to an unhardened OpenSSH v5.3 service:
Below is a screen shot of the client-auditing output when an unhardened OpenSSH v7.2 client connects:
Guides to harden server & client configuration can be found here: https://www.ssh-audit.com/hardening_guides.html
- 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-auditoption). - Added JSON output option (see
-j/--jsonoption; 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