CVE-2019-9343 in Android
Summary
by MITRE
In Bluetooth, there is a possible out of bounds read due to a missing bounds check. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Product: AndroidVersions: Android-10Android ID: A-112050983
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Analysis
by VulDB Data Team • 09/12/2020
The vulnerability identified as CVE-2019-9343 represents a critical out-of-bounds read flaw within the Bluetooth implementation of Android 10 systems. This issue stems from a fundamental missing bounds check in the Bluetooth protocol handling code, specifically affecting how the system processes incoming Bluetooth packets and data structures. The flaw exists in the kernel-level Bluetooth stack where insufficient validation occurs when processing malformed or unexpected packet data, creating a scenario where memory access occurs beyond the allocated buffer boundaries.
This vulnerability falls under CWE-129, which specifically addresses insufficient bounds checking in software implementations. The technical nature of the flaw allows for remote exploitation without requiring any form of user interaction or additional privileges beyond what is normally available to Bluetooth devices within range. Attackers can craft malicious Bluetooth packets that, when processed by the vulnerable Android 10 device, trigger the out-of-bounds memory read condition. The absence of user interaction requirements makes this particularly concerning as it enables automatic exploitation through passive Bluetooth scanning and packet injection techniques.
The operational impact of this vulnerability extends beyond simple information disclosure, as it could potentially expose sensitive system memory contents including cryptographic keys, user credentials, or other confidential data stored in memory regions accessible through the Bluetooth stack. The remote nature of exploitation means that adversaries can target vulnerable devices from considerable distances without physical access or prior authentication. This aligns with ATT&CK technique T1041, which describes data compression and exfiltration methods that can be leveraged through network-based attacks. The vulnerability affects all Android 10 devices and represents a significant security regression that undermines the integrity of the Bluetooth security model.
Mitigation strategies should focus on immediate patch deployment through official Android security updates that implement proper bounds checking mechanisms in the Bluetooth protocol handling code. Organizations should also consider implementing Bluetooth radio isolation measures and monitoring for anomalous Bluetooth traffic patterns that might indicate exploitation attempts. Network administrators should disable unnecessary Bluetooth services when not actively required and ensure that Bluetooth devices are configured to operate in secure modes that limit exposure to remote attackers. The vulnerability demonstrates the critical importance of robust input validation in kernel-level network protocols and highlights the need for comprehensive security testing of mobile operating system components that handle network communications.