Updated: April 29th, 2008
Update: The author of the module contacted me the same day and promised to fix it in the next version. Version 0.40 was indeed on cpan as promised, but I haven't tested it yet.
Passwd::Unix will corrupt your /etc/shadow file and rearrange login names and their corresponding password hashes.
The current version of Passwd::Unix corrupted my /etc/shadow upon only
calling the passwd() function. Immediately users started to report not
being able to login.
After examining the situation, I found that Passwd::Unix rearranges all
users in /etc/shadow in some way, but it only does it to the
usernames, and not the password hashes. Thus, you will get corrupted accounts. Moreover,
users are now able to login to one OTHER account, not …