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Day 29: Writable File Exploitation — Turning "Bad Permissions" into Root Shells 🕵️♂️
Day 29: 쓰기 가능 파일 악용 — 잘못된 권한 설정을 루트 셸로 전환하기
Why it matters
The article demonstrates three Linux privilege escalation techniques exploiting world-writable files: hijacking a systemd service's ExecStart script, injecting a reverse shell into a cron job, and appending a crafted user entry to /etc/passwd. It also provides an auditor's checklist for discovering writable files in critical directories like /opt/, /etc/systemd/, and /etc/cron*.
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Writable File ExploitationPrivilege EscalationSystemd HijackCron Job Injection/etc/passwdRoot Shell