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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.
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