pam_captcha information leak

Behaviour is different depending on user account existance...

pam_captcha username harvest vulnerability

pamcaptcha is visual text-based CAPTCHA challenge module for PAM that uses figlet to generate the CAPTCHAs. Project site: http://www.semicomplete.com/projects/pamcaptcha/ A site with a screen shot: http://www.michaelboman.org/how-to/securing-ssh-access-with-pam-captcha I found a security problem...