CVE-2022-25706 in Snapdragon Auto
Summary
by MITRE • 09/16/2022
Information disclosure in Bluetooth driver due to buffer over-read while reading l2cap length in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Wearables
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Analysis
by VulDB Data Team • 10/19/2022
This vulnerability represents a critical information disclosure flaw within Bluetooth driver implementations affecting multiple Snapdragon product lines including automotive, mobile, and IoT devices. The issue stems from an improper buffer handling mechanism during L2CAP (Logical Link Control and Adaptation Protocol) length reading operations, creating a condition where malicious actors could potentially access sensitive memory regions beyond allocated buffers. The vulnerability specifically manifests when the Bluetooth driver processes incoming L2CAP frames without adequate bounds checking, leading to an over-read condition that exposes kernel memory contents to unauthorized access.
The technical root cause of CVE-2022-25706 aligns with CWE-125, which describes out-of-bounds read vulnerabilities where programs access memory locations beyond the intended buffer boundaries. This flaw operates at the kernel level within the Bluetooth subsystem, where the driver fails to validate the length parameter before attempting to read L2CAP frame data. The vulnerability exists across multiple Snapdragon product categories including automotive systems, mobile devices, and IoT deployments, indicating a widespread impact that affects various device types and use cases. Attackers could exploit this condition to extract sensitive information such as kernel memory addresses, cryptographic keys, or other confidential data that might aid in further exploitation attempts.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides potential attackers with valuable memory layout information that could be leveraged for more sophisticated attacks. The presence of this flaw in automotive systems particularly raises concerns about vehicle security and the potential for remote code execution or data breaches in connected vehicles. Devices running affected Snapdragon chipsets could be compromised through Bluetooth-based attacks that exploit this buffer over-read condition, potentially allowing adversaries to gain insights into system memory structures and kernel internals. The vulnerability's presence in both mobile and IoT deployments creates a broad attack surface that could affect consumer devices, industrial equipment, and automotive systems simultaneously.
Mitigation strategies for CVE-2022-25706 should focus on implementing proper bounds checking mechanisms within the Bluetooth driver code, ensuring that all L2CAP length parameters are validated before buffer operations occur. System administrators should prioritize applying firmware updates from Snapdragon and device manufacturers to address this vulnerability. The implementation of kernel memory protection features such as stack canaries, address space layout randomization, and kernel address space protection can help reduce the exploitability of similar buffer over-read conditions. Additionally, network segmentation and Bluetooth access controls should be implemented to limit potential attack vectors, while monitoring systems should be deployed to detect anomalous Bluetooth traffic patterns that might indicate exploitation attempts. This vulnerability demonstrates the importance of robust input validation in kernel drivers and highlights the need for comprehensive security testing of embedded systems components that operate at the system level.