Some software programs have been problematic since their creation. NFS, NIS, and sendmail have had security vulnerabilities published since they were released.

  • NFS uses an IP address for authentication, and any IP address can be spoofed.
  • Sendmail applications are known to be troublesome, but can be searched to reveal possible attacks.
  • Windows 95 may allow users to login without passwords.
  • Windows NT may have a guest account with no password.
  • All systems running UNIX and NT should have all of the latest patches and service packs loaded to ensure that these security holes have been filled.