Each BSD installs a set of security scripts that run daily and the results are emailed to the superuser. These scripts check for possible security violations, including
• Checking the password databases for empty passwords and UIDs and GIDs of 0
• Checking for changes to .rhosts
• Checking for changes to SUID and SGID permissions
Details on these checks can be found in security.conf(5) on NetBSD, security(8) on OpenBSD, and periodic.conf(5) on FreeBSD.
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