For those of you without off-the-shelf vulnerability scanners, try this simple bash script to detect libssh and CVE-2018-10933 (Unauthenticated Bypass for libssh).

# Specify which ports to check for SSH servers
for port in 22 2022 2222
do
        # Substitute your target subnets and hosts
        for ip in 192.168.{0..10}.{0.255}
        do
                echo "$ip:$port" >> results.txt
                # Banner grab with netcat (adjust -w for timeout)
                echo "" | nc -q0 -w2 ${ip} ${port} >> results.txt
        done
done
 
# Display libssh findings
grep -i libssh -B1 results.txt

Output:

192.168.0.101:22
SSH-2.0-libssh_0.7.0
--
192.168.1.5:2022
SSH-2.0-libssh_0.7.0
--
192.168.10.10:2222
SSH-2.0-libssh_0.7.0