What it does. Assess Bluetooth Low Energy (BLE) device security using Python's bleak asyncio Part of mukul975/Anthropic-Cybersecurity-Skills (817 security skills) (mukul975/Anthropic-Cybersecurity-Skills).

Install

• npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill performing-bluetooth-security-assessment, or copy the skill folder into ~/.claude/skills/performing-bluetooth-security-assessment/.
• Raw file: curl -sL https://raw.githubusercontent.com/mukul975/Anthropic-Cybersecurity-Skills/HEAD/skills/performing-bluetooth-security-assessment/SKILL.md

SKILL.md (verbatim)

name: performing-bluetooth-security-assessment
description: Assess Bluetooth Low Energy (BLE) device security using Python's bleak asyncio
  library to discover nearby devices, enumerate GATT services and characteristics, and flag
  unencrypted or unauthenticated read/write access to sensitive data. Use when auditing IoT,
  healthcare, fitness, or smart-home BLE devices for weak pairing configurations or known
  vulnerable device fingerprints.
domain: cybersecurity
subdomain: wireless-security
tags:
- bluetooth
- ble
- gatt
- wireless-security
version: '1.0'
author: mahipal
license: Apache-2.0
nist_csf:
- PR.IR-01
- DE.CM-01
- ID.AM-03
mitre_attack:
- T1557
- T1040

Performing Bluetooth Security Assessment

Overview

This skill covers performing Bluetooth Low Energy (BLE) security assessments using the Python bleak library. BLE devices are ubiquitous in IoT, healthcare, fitness, and smart home applications, and many ship with weak or absent security controls. This assessment identifies unencrypted GATT characteristics, devices broadcasting sensitive data, known vulnerable device fingerprints, and improperly secured pairing configurations.

The agent uses bleak's asyncio API to discover nearby BLE devices, connect to target devices, enumerate all GATT services and characteristics, and analyze security properties of each characteristic. It flags characteristics that allow unauthenticated read/write access to sensitive data and identifies devices matching known vulnerable profiles.

When to Use

• When conducting security assessments that involve performing bluetooth security assessment
• When following incident response procedures for related security events
• When performing scheduled security testing or auditing activities
• When validating security controls through hands-on testing

Prerequisites

• Python 3.9 or later
• bleak library (pip install bleak)
• Bluetooth adapter supporting BLE (Bluetooth 4.0+)
• Linux: BlueZ 5.43+ with D-Bus permissions
• Windows: Windows 10 version 1709+ with Bluetooth support
• macOS: macOS 10.15+ with CoreBluetooth

Steps

1. Scan for BLE devices: Use BleakScanner to discover all advertising BLE devices within range. Capture device name, address (MAC), RSSI signal strength, and advertised service UUIDs.

2. Identify target devices: Filter discovered devices by name pattern, address, or minimum signal strength. Flag devices broadcasting default or well-known vulnerable names.

3. Connect and enumerate GATT services: Use BleakClient to connect to the target device and iterate over all GATT services. For each service, record the UUID, description, and contained characteristics.

4. Analyze characteristic properties: For each characteristic, examine its properties (read, write, write-without-response, notify, indicate). Flag characteristics that expose read or write access without requiring authentication or encryption.

5. Check for known vulnerable UUIDs: Compare discovered service and characteristic UUIDs against a database of known vulnerable or sensitive services (Heart Rate, Blood Pressure, Device Information, Battery Level) that should require encryption.

6. Detect unencrypted data exposure: Attempt to read characteristics that should be protected. Successful unauthenticated reads of sensitive data indicate missing security controls.

7. Generate security report: Compile all findings into a structured JSON report with severity classifications and remediation recommendations.

Expected Output

{
  "assessment_type": "ble_security_audit",
  "target_device": {
    "name": "SmartBand-XR",
    "address": "AA:BB:CC:DD:EE:FF",
    "rssi": -42
  },
  "services_found": 5,
  "characteristics_found": 18,
  "findings": [
    {
      "severity": "high",
      "finding": "Heart Rate Measurement readable without encryption",
      "uuid": "00002a37-0000-1000-8000-00805f9b34fb",
      "properties": ["read", "notify"],
      "remediation": "Enable encryption requirement on characteristic"
    }
  ],
  "risk_score": 7.5
}

Other files in this skill

• LICENSE
• references/api-reference.md
• scripts/agent.py

references/api-reference.md (verbatim)

BLE Security Assessment API Reference

Bleak Python Library (v0.21+)

Device Discovery

from bleak import BleakScanner

# Scan with advertisement data
devices = await BleakScanner.discover(timeout=10.0, return_adv=True)
# Returns: dict[str, tuple[BLEDevice, AdvertisementData]]

# Find specific device
device = await BleakScanner.find_device_by_name("DeviceName", timeout=10.0)
device = await BleakScanner.find_device_by_address("AA:BB:CC:DD:EE:FF", timeout=10.0)

GATT Client Operations

from bleak import BleakClient

async with BleakClient(address, timeout=15.0) as client:
    # Enumerate services
    for service in client.services:
        print(service.uuid, service.description)
        for char in service.characteristics:
            print(char.uuid, char.properties, char.descriptors)

    # Read characteristic
    value = await client.read_gatt_char("00002a19-0000-1000-8000-00805f9b34fb")

    # Write characteristic
    await client.write_gatt_char(char_uuid, bytearray([0x01, 0x02]))

    # Subscribe to notifications
    await client.start_notify(char_uuid, callback)
    await client.stop_notify(char_uuid)

Common GATT Service UUIDs

BLE Security Modes

Linux BlueZ Commands

# Scan for BLE devices
sudo hcitool lescan

# Device info
sudo hcitool leinfo AA:BB:CC:DD:EE:FF

# Interactive GATT tool
gatttool -b AA:BB:CC:DD:EE:FF -I
> connect
> primary          # List services
> characteristics  # List characteristics
> char-read-hnd 0x000e

# btmgmt commands
sudo btmgmt info
sudo btmgmt find -l
sudo btmgmt pair -c 3 -t 0 AA:BB:CC:DD:EE:FF

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