Create exploit_patch.sh, code execution exploit! critical!

exploit_patch.sh

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+cat > security_patch.py << 'EOF'
+#!/usr/bin/env python3
+"""
+SECURITY PATCH for PyBitMessage - Critical RCE Vulnerability Fix
+Author: Security Researcher
+Date: $(date +%Y-%m-%d)
+
+VULNERABILITY DESCRIPTION:
+The file pybitmessage/network/knownnodes.py contained a critical Remote Code 
+Execution (RCE) vulnerability through unsafe pickle deserialization.
+
+The vulnerable code was:
+    knownNodes = pickle.load(source)  # nosec B301
+
+WHY THIS IS CRITICAL:
+- pickle.load() can execute arbitrary Python code during deserialization
+- Any maliciously crafted knownnodes.dat file could compromise the system
+- This is the same type of vulnerability that was exploited in PyBitMessage 0.6.2
+- The # nosec comment indicated awareness but no actual fix was implemented
+
+This patch completely removes pickle functionality and provides safe fallbacks.
+"""
+
+import os
+import re
+import sys
+
+def apply_security_patch():
+    """Apply security patch to remove unsafe pickle deserialization"""
+
+    file_path = 'pybitmessage/network/knownnodes.py'
+
+    if not os.path.exists(file_path):
+        print(f"❌ Error: {file_path} not found!")
+        return False
+
+    # Create backup
+    backup_path = file_path + '.backup'
+    try:
+        with open(file_path, 'r') as f:
+            original_content = f.read()
+        with open(backup_path, 'w') as f:
+            f.write(original_content)
+        print(f"✅ Backup created: {backup_path}")
+    except Exception as e:
+        print(f"❌ Failed to create backup: {e}")
+        return False
+
+    # Remove pickle import
+    new_content = re.sub(
+        r'^import pickle.*# nosec B403\s*$',
+        '# import pickle  # REMOVED FOR SECURITY - UNSAFE DESERIALIZATION',
+        original_content,
+        flags=re.MULTILINE
+    )
+
+    # Replace pickle deserialization function with safe version
+    old_pickle_function = '''def pickle_deserialize_old_knownnodes(source):
+    """
+    Unpickle source and reorganize knownnodes dict if it has old format
+    the old format was {Peer:lastseen, ...}
+    the new format is {Peer:{"lastseen":i, "rating":f}}
+    """
+    global knownNodes
+    logger.debug("DEBUG: Starting pickle_deserialize_old_knownnodes")
+    knownNodes = pickle.load(source)  # nosec B301
+    logger.debug("DEBUG: Loaded old format knownNodes with %d streams", len(knownNodes))
+    for stream in knownNodes.keys():
+        logger.debug("DEBUG: Processing stream %s with %d nodes", stream, len(knownNodes[stream]))
+        for node, params in six.iteritems(knownNodes[stream]):
+            if isinstance(params, (float, int)):
+                logger.debug("DEBUG: Converting old format node %s", node.host)
+                addKnownNode(stream, node, params)
+    logger.debug("DEBUG: Completed pickle_deserialize_old_knownnodes")'''
+
+    new_pickle_function = '''def pickle_deserialize_old_knownnodes(source):
+    """
+    DISABLED FOR SECURITY - UNSAFE PICKLE DESERIALIZATION REMOVED
+
+    Original purpose: Unpickle source and reorganize knownnodes dict if it has old format
+    Security risk: pickle.load() allows arbitrary code execution via malicious knownnodes.dat
+
+    This function now safely handles the case without RCE vulnerability.
+    """
+    global knownNodes
+    logger.error("🔒 SECURITY: Unsafe pickle deserialization was attempted but has been disabled")
+    logger.error("🔒 This prevents Remote Code Execution via malicious knownnodes.dat files")
+    logger.error("🔒 Please delete knownnodes.dat and restart PyBitMessage to regenerate safe version")
+
+    # Safe fallback: use empty knownNodes instead of risky deserialization
+    knownNodes = {}
+
+    # Security measure: automatically remove potentially malicious file
+    try:
+        import os
+        from pybitmessage import state
+        knownnodes_path = os.path.join(state.appdata, 'knownnodes.dat')
+        if os.path.exists(knownnodes_path):
+            os.remove(knownnodes_path)
+            logger.info("🔒 Security: Removed potentially malicious knownnodes.dat")
+    except Exception as e:
+        logger.error("Could not remove knownnodes.dat: %s", e)'''
+
+    if old_pickle_function in new_content:
+        new_content = new_content.replace(old_pickle_function, new_pickle_function)
+    else:
+        print("⚠️  Could not find exact pickle function pattern, applying import removal only")
+
+    # Update readKnownNodes to handle the change
+    new_content = re.sub(
+        r'except ValueError:\s*logger\.debug\("DEBUG: JSON failed, trying pickle deserialization"\)\s*source\.seek\(0\)\s*pickle_deserialize_old_knownnodes\(source\)',
+        'except ValueError:\n                    logger.debug("DEBUG: JSON failed - pickle disabled for security")\n                    createDefaultKnownNodes()',
+        new_content
+    )
+
+    # Write patched file
+    try:
+        with open(file_path, 'w') as f:
+            f.write(new_content)
+        print("✅ Security patch applied successfully!")
+        print("🔒 Removed: import pickle (RCE vulnerability)")
+        print("🔒 Fixed: pickle_deserialize_old_knownnodes() function")
+        print("🔒 Updated: readKnownNodes() to use safe fallback")
+
+        # Verify patch
+        with open(file_path, 'r') as f:
+            patched_content = f.read()
+            if 'import pickle' in patched_content and 'import pickle  # REMOVED' not in patched_content:
+                print("⚠️  Warning: pickle import might still be present")
+            else:
+                print("✅ Verified: pickle import properly removed")
+
+        return True
+
+    except Exception as e:
+        print(f"❌ Failed to write patched file: {e}")
+        # Restore backup
+        try:
+            with open(backup_path, 'r') as f:
+                backup_content = f.read()
+            with open(file_path, 'w') as f:
+                f.write(backup_content)
+            print("✅ Original file restored from backup")
+        except:
+            print("❌ CRITICAL: Could not restore backup!")
+        return False
+
+def verify_vulnerability_fixed():
+    """Verify that the RCE vulnerability has been patched"""
+    print("\n" + "="*60)
+    print("SECURITY VERIFICATION")
+    print("="*60)
+
+    file_path = 'pybitmessage/network/knownnodes.py'
+
+    try:
+        with open(file_path, 'r') as f:
+            content = f.read()
+
+        checks = [
+            ('import pickle' not in content or 'import pickle  # REMOVED' in content, 
+             "Pickle import removed or commented"),
+            ('pickle.load(' not in content, "No unsafe pickle.load() calls"),
+            ('def pickle_deserialize_old_knownnodes' in content, "Function still exists for compatibility"),
+            ('logger.error("🔒 SECURITY:"' in content, "Security warnings added")
+        ]
+
+        all_passed = True
+        for check, description in checks:
+            if check:
+                print(f"✅ PASS: {description}")
+            else:
+                print(f"❌ FAIL: {description}")
+                all_passed = False
+
+        if all_passed:
+            print("\n🎉 ALL SECURITY CHECKS PASSED! RCE VULNERABILITY FIXED!")
+        else:
+            print("\n⚠️  Some security checks failed - please review manually")
+
+        return all_passed
+
+    except Exception as e:
+        print(f"❌ Verification failed: {e}")
+        return False
+
+if __name__ == "__main__":
+    print("PyBitMessage Security Patch - RCE Vulnerability Fix")
+    print("=" * 50)
+
+    if apply_security_patch():
+        verify_vulnerability_fixed()
+        print("\n📝 NEXT STEPS:")
+        print("1. Delete any existing knownnodes.dat files")
+        print("2. Restart PyBitMessage to generate new safe knownnodes.dat")
+        print("3. Share this patch with the PyBitMessage community")
+        print("4. Consider updating tests in tests/core.py to remove pickle usage")
+    else:
+        print("\n❌ Patch failed - please apply changes manually")
+        sys.exit(1)
+EOF
+
+echo "✅ Security patch script created: security_patch.py"
+echo "🚀 Run it with: python3 security_patch.py"