LinuxPPC Security released a new security update for the pam utility
Package pam (Pluggable Authentication Modules)
Problem Bug fix: In certain network configurations,
pam may allow access to locked NIS accounts.
LinuxPPC recommends pam users who use NIS upgrade immediately.
Note: LinuxPPC R5/Q3 users don't need to re-enter their passwords if
they download this update. It uses a more recent code base than the PAM
fix shipped by YDL, which didn't have any backwards compatibility,
therefore forcing users to re-enter their passwords.