CVE-2024-45432: OpenSynergy BlueSDK Information Disclosure

CVE-2024-45432 Overview

CVE-2024-45432 affects OpenSynergy BlueSDK (also known as Blue SDK) versions through 6.x. The vulnerability stems from improper handling of a function call within the BlueSDK Bluetooth stack. An incorrect variable is used as a function argument, leading to unexpected behavior or disclosure of sensitive information. The flaw is categorized under [CWE-284] Improper Access Control. BlueSDK is widely embedded in automotive infotainment systems and other connected devices, expanding the potential attack surface. Remote attackers can trigger the issue over the network without authentication or user interaction.

Critical Impact

Network-reachable attackers can manipulate BlueSDK function calls to extract sensitive information from affected Bluetooth stack implementations without authentication.

Affected Products

• OpenSynergy BlueSDK (Blue SDK) versions through 6.x
• Embedded systems and infotainment platforms shipping the vulnerable BlueSDK Bluetooth stack
• OEM products integrating opensynergy:blue_sdk components

Discovery Timeline

• 2025-09-12 - CVE-2024-45432 published to NVD
• 2025-10-02 - Last updated in NVD database

Technical Details for CVE-2024-45432

Vulnerability Analysis

The vulnerability resides in the BlueSDK Bluetooth stack, where an internal function receives an incorrect variable as one of its arguments. This argument mismatch causes the function to operate on unintended data, producing inconsistent program state. Depending on the execution path reached, an attacker can either induce unexpected behavior or read data that should remain inaccessible. The flaw is classified as Improper Access Control [CWE-284] because the affected logic fails to constrain which data the function operates on. Because Bluetooth profiles in BlueSDK process attacker-influenced inputs across multiple protocol layers, the incorrect argument can be triggered through crafted protocol exchanges.

Root Cause

A developer-introduced variable mix-up passes the wrong value to a function expecting a different context-specific argument. The stack does not validate the argument before dereferencing or comparing it. As a result, downstream access checks operate on data that was never meant to gate the protected resource, weakening the boundary between caller context and the function's privileged data path.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker within Bluetooth range, or able to relay crafted traffic to the BlueSDK stack, can drive the affected code path during normal protocol handling. Successful exploitation yields a confidentiality impact, allowing the attacker to retrieve sensitive information from the device. Integrity and availability are not directly affected according to the published CVSS vector. Refer to the PCA Cybersecurity Advisory for technical context on the broader PerfektBlue research that documents this flaw.

No verified public exploit code is available; the vulnerability is described in prose form by the upstream advisory.

Detection Methods for CVE-2024-45432

Indicators of Compromise

• Anomalous Bluetooth pairing or service discovery sequences directed at devices running BlueSDK
• Unexpected outbound data flows from infotainment or embedded systems following Bluetooth sessions with unknown peers
• Crashes, reboots, or log entries from BlueSDK components referencing invalid argument states

Detection Strategies

• Inventory firmware and embedded software to identify devices integrating opensynergy:blue_sdk at or below version 6.x
• Monitor Bluetooth host controller interface (HCI) traces for malformed or unusual L2CAP, RFCOMM, and SDP exchanges
• Correlate device telemetry with proximity events to flag sessions initiated by unauthenticated peers

Monitoring Recommendations

• Centralize embedded device logs and Bluetooth stack diagnostics in a SIEM or data lake for retrospective analysis
• Establish baselines for normal Bluetooth pairing volume and alert on deviations targeting BlueSDK-enabled fleets
• Track vendor advisories from OEMs that integrate BlueSDK and align identification rules to released patch versions

How to Mitigate CVE-2024-45432

Immediate Actions Required

• Identify all assets running OpenSynergy BlueSDK 6.x or earlier and prioritize them for remediation
• Contact device OEMs and integrators to obtain firmware updates incorporating the fixed BlueSDK release
• Restrict Bluetooth discoverability and pairing on affected devices until patches are applied

Patch Information

OpenSynergy addresses the issue in updated BlueSDK builds distributed to licensees. Because BlueSDK is delivered as a licensed component, downstream OEMs must rebuild and redistribute firmware containing the fixed library. Consult the PCA Cybersecurity Advisory and the OpenSynergy Homepage for vendor coordination details and fixed-version guidance.

Workarounds

• Disable Bluetooth on impacted devices where the function is non-essential to operations
• Limit Bluetooth visibility to non-discoverable mode and require manual approval for new pairings
• Segment vulnerable embedded devices from sensitive networks and restrict adjacent wireless access where feasible

# Example: disable Bluetooth service on a Linux-based embedded host until firmware is updated
systemctl stop bluetooth
systemctl disable bluetooth
rfkill block bluetooth