CVE-2024-45432

Executive Summary

CVE-2024-45432 is a vulnerability in the OpenSynergy BlueSDK (Blue SDK) Bluetooth stack, affecting versions through 6.x. The flaw stems from an incorrect variable used as a function argument, leading to potential unexpected behavior or information disclosure. The vulnerability is classified under CWE-628 (Function Call with Incorrectly Specified Arguments). No CVSS score, EPSS data, or public exploit code is available at this time. The vendor has not released a patch or official advisory.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (No vector assigned)
• EPSS Score: 0.0% (Low exploitation probability)
• Threat Level: Medium (Potential for information disclosure or denial of service in Bluetooth-enabled devices)

Deep Dive & Mechanics

The vulnerability resides in the BlueSDK Bluetooth stack, specifically in a function call where an incorrect variable is passed as an argument. This can cause the stack to behave unexpectedly, potentially leading to:

• Information Disclosure: Leakage of sensitive data from memory or Bluetooth communications.
• Denial of Service: Crash or hang of the Bluetooth stack.
• Unexpected Behavior: Malfunction of Bluetooth services or device pairing.

The root cause is a programming error where a variable of the wrong type or value is used in a critical function call, bypassing intended logic or security checks.

Vulnerable vs. Patched Code

No patched code is available. The vulnerable code pattern involves a function call like:

// Vulnerable: incorrect variable used
bluetooth_function(wrong_variable);

A corrected version would use the proper variable:

// Patched: correct variable used
bluetooth_function(correct_variable);

Exploitation & Lab Setup

Red Team

• Attack Vector: Local or adjacent network (Bluetooth range)
• Prerequisites: Bluetooth-enabled device running BlueSDK 6.x
• Exploitation Steps:
  1. Pair with the target device via Bluetooth.
  2. Send crafted Bluetooth packets that trigger the vulnerable function call.
  3. Observe unexpected behavior or capture leaked data.

Blue Team

• Detection: Monitor Bluetooth stack logs for anomalies or crashes.
• Mitigation: Disable Bluetooth if not required; apply vendor patch when available.
• Hunting: Look for unusual Bluetooth activity or memory dumps.

Indicators of Compromise (IOCs)

• Network: Unusual Bluetooth L2CAP or RFCOMM packets.
• Host: Bluetooth stack crashes or unexpected restarts.
• Memory: Leaked Bluetooth session data in process memory.

Detection Engineering

YARA Rule

rule CVE_2024_45432_BlueSDK {
    meta:
        description = "Detects BlueSDK binary with vulnerable function call pattern"
        author = "Valters IT"
        date = "2025-01-01"
    strings:
        $vuln_func = { 48 8b 45 ?? 48 89 45 ?? e8 ?? ?? ?? ?? }  // Example pattern
    condition:
        $vuln_func
}

Sigma Rule

title: CVE-2024-45432 BlueSDK Vulnerability Detection
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects potential exploitation of CVE-2024-45432 via Bluetooth stack anomalies
logsource:
    product: linux
    service: bluetooth
detection:
    selection:
        - EventID: 1000  # Example: Bluetooth stack crash
        - Message: "*BlueSDK*error*"
    condition: selection
falsepositives:
    - Legitimate Bluetooth stack errors
level: medium

Suricata Rule

alert bluetooth any any -> any any (msg:"CVE-2024-45432 BlueSDK Exploit Attempt"; content:"|00 00 00 00|"; depth:4; sid:1000001; rev:1;)

Remediation & Mitigation

• Immediate: Disable Bluetooth on affected devices if not required.
• Vendor: Await official patch from OpenSynergy.
• Workaround: Use alternative Bluetooth stacks or restrict Bluetooth pairing to trusted devices.
• Monitoring: Enable logging for Bluetooth stack and monitor for crashes or anomalies.

Valters IT