CVE-2022-20089 in MT6580
Summary
by MITRE • 05/04/2022
In aee driver, there is a possible memory corruption due to active debug code. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS06240397; Issue ID: ALPS06240397.
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Analysis
by VulDB Data Team • 05/07/2022
The vulnerability identified as CVE-2022-20089 resides within the aee driver component of Android-based systems, representing a critical memory corruption flaw that stems from active debug code present in the kernel module. This issue manifests as a potential local privilege escalation vector that could allow an attacker with system execution privileges to elevate their access level to full system privileges without requiring any user interaction for exploitation. The presence of debug code within production driver implementations creates an inherent security risk that has been specifically addressed through patch ALPS06240397, which was developed to remediate this vulnerability in affected Android devices.
The technical nature of this flaw involves memory corruption that occurs when debug code within the aee driver executes, potentially leading to arbitrary code execution at system level privileges. This vulnerability operates at the kernel level where the aee driver manages system error reporting and debugging functionalities, making it a prime target for privilege escalation attacks. The flaw demonstrates poor software development practices where debugging mechanisms were not properly removed or disabled in production builds, creating an attack surface that could be exploited by malicious actors with system-level access. The vulnerability's classification as a local privilege escalation indicates that the attacker must already possess system execution privileges to initiate exploitation, though the end result allows for complete system compromise.
The operational impact of CVE-2022-20089 extends beyond simple privilege escalation, as it represents a fundamental weakness in the Android security model's kernel-level defenses. This vulnerability can be leveraged by malware or malicious applications that have already gained system-level access to achieve complete system compromise, potentially enabling unauthorized access to all device data, communication channels, and system resources. The lack of user interaction requirement makes this vulnerability particularly dangerous as it can be exploited automatically without any user awareness or consent, creating a persistent threat vector for attackers who have already gained initial system access. The vulnerability affects a wide range of Android devices that utilize the affected driver implementation, potentially impacting millions of users across various device manufacturers.
Mitigation strategies for CVE-2022-20089 primarily focus on applying the vendor-specific patch ALPS06240397, which addresses the root cause by properly removing or disabling the debug code within the aee driver. System administrators and device manufacturers should prioritize the deployment of this patch across all affected devices to eliminate the memory corruption vulnerability. Additionally, security monitoring should include detection of any attempts to access or manipulate kernel-level debug interfaces that could indicate exploitation attempts. The vulnerability aligns with CWE-665: Improper Initialization and CWE-755: Improper Handling of Exceptional Conditions, both of which relate to improper code management and exception handling in kernel modules. From an ATT&CK framework perspective, this vulnerability maps to T1068: Exploitation for Privilege Escalation, as it provides a mechanism for local attackers to escalate their privileges within the system, and T1543: Create or Modify System Process, due to the kernel-level nature of the exploit. Organizations should implement comprehensive patch management processes to ensure timely deployment of such critical security updates and maintain visibility into kernel-level activities that could indicate exploitation attempts.