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What can be done to protect my systems?
''The life expectancy of a default, unsecured installation of Red Hat 6.2 server is less then 72 hours.'' -- Lance Spitzner
#1 - Common sense!
- Use strong passwords
- Patch the system as necessary
- Don't connect to Internet before patching
Turn off unused services
Don't use insecure protocols
- (such as telnet / r* commands)
- use ssh & scp
Notes:
Strong passwords
Make sure they don't appear in a dictionary (even when substituting numbers).
Use special characters and mixed case.
Don't use the same password on machines you don't own and have physical control over (how many of you have the same password at home as you do at your ISP? How about that colo machine?)