CVE-2019-2227 in Android
Summary
by MITRE
In DeepCopy of btif_av.cc, there is a possible out of bounds read due to improper casting. This could lead to remote information disclosure over Bluetooth with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-9 Android-10Android ID: A-140768453
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Analysis
by VulDB Data Team • 03/09/2024
The vulnerability described in CVE-2019-2227 represents a critical out-of-bounds read flaw within the Bluetooth Audio Video Streaming profile implementation of Android systems. This issue resides in the DeepCopy function of the btif_av.cc file, which is part of the Bluetooth interface framework responsible for managing audio video streaming operations. The vulnerability stems from improper casting operations that fail to properly validate buffer boundaries during data copying processes. The flaw specifically affects Android 9 and Android 10 versions, with the Android ID A-140768453 tracking the specific issue within Google's internal tracking system. This type of vulnerability falls under CWE-129, which addresses improper validation of array index values, and represents a classic example of buffer over-read conditions that can occur when developers fail to properly validate input data boundaries during memory operations.
The operational impact of this vulnerability extends beyond simple data exposure, as it enables remote information disclosure through Bluetooth connections without requiring any additional privileges or user interaction. Attackers can exploit this weakness by establishing a Bluetooth connection to a vulnerable device and triggering the specific code path that leads to the out-of-bounds read. The nature of this flaw means that an attacker positioned within Bluetooth range of a target device can potentially extract sensitive information from memory locations that should remain protected. This vulnerability aligns with ATT&CK technique T1041, which covers data compression and encryption, as the information disclosure could potentially expose sensitive system data that might aid in further exploitation attempts. The fact that no user interaction is required makes this particularly dangerous as it can be exploited automatically without the target device user's knowledge or consent.
The exploitation of this vulnerability demonstrates the importance of proper input validation and memory management in mobile operating systems where Bluetooth services are frequently exposed to external networks. The improper casting that leads to this condition suggests a lack of bounds checking when copying data structures that are part of the Bluetooth audio streaming protocol implementation. This type of flaw is particularly concerning in mobile environments where Bluetooth is constantly active and serves as an attack surface for remote exploitation. Security researchers have noted that similar issues in Bluetooth stack implementations have historically led to more severe consequences including arbitrary code execution, making this information disclosure vulnerability a potential precursor to more serious attacks. The vulnerability's classification as a remote information disclosure threat means that it can be leveraged to gather system information, potentially including cryptographic keys, user data, or other sensitive information stored in memory, which could then be used to compromise the device further. Organizations should prioritize patching this vulnerability through official Android security updates, as the nature of the flaw makes it particularly attractive to threat actors seeking to exploit mobile devices in the wild.