Securing your Linux server is important to protect your data, intellectual property, and time, from the hands of crackers (hackers). The system administrator is responsible for security Linux box. In this first part of a Linux server security series, I will provide 20 hardening tips for default installation of Linux system.
1: Encrypt Data Communication
2: Minimize Software to Minimize Vulnerability
3: One Network Service Per System or VM Instance
4: Keep Linux Kernel and Software Up to Date
5: Use Linux Security Extensions
6: User Accounts and Strong Password Policy
7: Disable root Login
8: Physical Server Security
9: Disable Unwanted Services
10: Delete X Windows
11: Configure Iptables and TCPWrappers
12: Linux Kernel /etc/sysctl.conf Hardening
13: Separate Disk Partitions
14: Turn Off IPv6
15: Disable Unwanted SUID and SGID Binaries
16: Use A Centralized Authentication Service
17: Logging and Auditing
18: Secure OpenSSH Server
19: Install And Use Intrusion Detection System
20: Protecting Files, Directories and Email
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