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The 5 Most Overlooked Linux Files That Could Expose Your Server to Hackers
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Intro:
You installed firewalls, disabled root login, and even configured fail2ban. You’re secure, right? Maybe not. In my security audits, the biggest threats didn’t come from open ports — they came from quietly ignored files that leak sensitive data or allow privilege escalation. Let’s go through 5 Linux files that most admins forget to check — and how to lock them down.
1. /var/log/auth.log (Ubuntu) or /var/log/secure (Red Hat)
Why it’s risky:
- Reveals all login attempts — successful and failed
- Can show usernames, IPs, and brute-force clues
What to do:
- Monitor it regularly
- Secure it with strict permissions:
- sudo chmod 600 /var/log/auth.log
2. /etc/bash_history
Why it’s risky:
- Often stores passwords, tokens, or sensitive commands
Best practices:
unset HISTFILEexport HISTSIZE=0
Or make it write-protected:
chmod 400…