CVE-2019-9288 in Android
Summary
by MITRE
In libhidcommand_jni, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege in the USB service with no additional execution privileges needed. User interaction is not needed for exploitation. Product: AndroidVersions: Android-10Android ID: A-111363077
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Analysis
by VulDB Data Team • 09/12/2020
The vulnerability identified as CVE-2019-9288 resides within the libhidcommand_jni library component of Android systems, specifically affecting Android 10 releases. This issue represents a critical security flaw that manifests as a potential out-of-bounds write condition, fundamentally compromising the integrity of the USB service execution environment. The vulnerability stems from the absence of proper bounds checking mechanisms within the native JNI (Java Native Interface) implementation that handles HID (Human Interface Device) command processing. The flaw exists in the communication layer between Java applications and native system components responsible for managing USB device interactions, creating a pathway for malicious code execution.
The technical nature of this vulnerability places it squarely within CWE-129, which addresses improper validation of array index values, and more specifically aligns with CWE-787, which deals with out-of-bounds write conditions. The flaw operates at the intersection of privilege escalation and system service manipulation, where an attacker can leverage the missing bounds check to overwrite memory locations within the USB service process. This particular vulnerability is classified under the ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation," and specifically relates to the "Local Privilege Escalation" category within the framework. The vulnerability's exploitation requires no user interaction, making it particularly dangerous as it can be triggered automatically during normal USB device connection processes.
The operational impact of CVE-2019-9288 extends beyond simple privilege escalation to encompass potential system compromise and data exposure. When exploited, this vulnerability enables local privilege escalation within the USB service context, allowing attackers to gain elevated privileges without requiring additional execution privileges or user interaction. The USB service in Android systems typically operates with high privileges to facilitate device communication, making this a prime target for attackers seeking system-level access. The vulnerability's exploitation can lead to complete system compromise, as the USB service often has access to critical system resources and can be used to establish persistent access or execute arbitrary code with elevated privileges. The lack of user interaction requirements means that simply connecting a malicious USB device or triggering USB communication could result in automatic privilege escalation.
Mitigation strategies for CVE-2019-9288 must address both immediate remediation and long-term security hardening measures. The primary fix involves implementing proper bounds checking mechanisms within the libhidcommand_jni library, ensuring that all array accesses are validated against legitimate memory boundaries. Organizations should deploy the Android security patches released by Google, specifically targeting the Android 10 updates that address this vulnerability. Additional protective measures include implementing runtime application protection (RAP) techniques, memory corruption detection systems, and network segmentation to limit potential exploitation paths. Security professionals should also consider implementing monitoring solutions that detect anomalous USB service behavior and unauthorized privilege escalation attempts. The vulnerability's classification as a local privilege escalation issue also necessitates regular security audits of system services and proper access control implementations to prevent exploitation even if other security measures fail.