CVE-2020-0129 in Android
Summary
by MITRE
In SetData of btm_ble_multi_adv.cc, there is a possible out-of-bound write due to an incorrect bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-10Android ID: A-123292010
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Analysis
by VulDB Data Team • 06/12/2020
The vulnerability identified as CVE-2020-0129 resides within the Bluetooth multi-advertisement implementation in Android 10, specifically within the SetData function of the btm_ble_multi_adv.cc source file. This flaw represents a critical security weakness that could enable local privilege escalation without requiring any additional execution privileges or user interaction for exploitation. The vulnerability manifests as an out-of-bounds write condition that stems from an incorrect bounds check implementation within the Bluetooth subsystem.
The technical root cause of this vulnerability lies in the improper validation of data boundaries when processing Bluetooth advertisement data structures. When the SetData function handles incoming advertisement data, it fails to properly verify that the data being written falls within the allocated memory boundaries. This incorrect bounds checking allows an attacker to write data beyond the intended memory allocation, potentially corrupting adjacent memory regions. The flaw is particularly dangerous because it operates within the Bluetooth subsystem's core functionality, which runs with elevated privileges necessary for Bluetooth operations.
From an operational perspective, this vulnerability presents a significant risk to Android 10 devices as it enables local privilege escalation without requiring user interaction or additional privileges. An attacker with local access to an Android 10 device could exploit this vulnerability to gain elevated privileges and potentially execute arbitrary code with system-level permissions. The lack of user interaction requirements makes this vulnerability particularly concerning for mobile environments where devices are frequently accessed by multiple users or where malicious applications might be present. The vulnerability impacts the core Bluetooth functionality and could potentially be leveraged to compromise device security or access sensitive data.
The security implications extend beyond simple privilege escalation, as this vulnerability could be exploited to gain access to system resources, manipulate Bluetooth operations, or potentially escalate to full system compromise. The flaw aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of improper bounds checking that can lead to memory corruption. From an attack framework perspective, this vulnerability would fall under the privilege escalation category in the MITRE ATT&CK framework, specifically targeting the privilege escalation techniques that leverage software vulnerabilities. The vulnerability's impact is particularly severe given that Bluetooth functionality typically requires elevated system permissions and operates in a privileged context. Organizations should implement immediate mitigations including applying the relevant Android security patches and monitoring for potential exploitation attempts. The vulnerability underscores the critical importance of proper bounds checking in system-level code and highlights the risks associated with Bluetooth subsystem implementations in mobile operating systems.