Simple ball knowledge

defaultcreds-cheat-sheet

theres a pip package called defaultcreds-cheat-sheet that can be used to check for default credentials.

#install 
pip3 install defaultcreds-cheat-sheet
# use 
creds search <service>
#eg,
creds search smb
creds search linksys

The histroy of passwords in linux is stored in /etc/security/opasswd

if we setup PAM to prevent users from reusing old passwds thses passwd are stored in the /etc/security/opasswd file.