CVE-2022-20099 in MT6580
Summary
by MITRE • 05/04/2022
In aee daemon, there is a possible out of bounds write due to improper input validation. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS06296442; Issue ID: ALPS06296442.
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Analysis
by VulDB Data Team • 05/07/2022
The CVE-2022-20099 vulnerability resides within the aee daemon component of Android-based systems, representing a critical out-of-bounds write flaw that fundamentally compromises system security. This vulnerability specifically affects the Android Linux kernel and embedded systems where the aee daemon operates as a crucial diagnostic and error reporting service. The aee daemon, which stands for Android Error Exception, is responsible for capturing system crashes and generating diagnostic information for debugging purposes, making it a privileged component that requires careful security scrutiny. The vulnerability stems from inadequate input validation mechanisms within the daemon's processing logic, where malicious or malformed input can cause the application to write data beyond the allocated memory boundaries.
The technical exploitation of this vulnerability manifests through improper bounds checking during data processing within the aee daemon. When the daemon receives input data, it fails to validate the size or content of incoming buffers before performing memory operations, creating an opportunity for attackers to craft specific inputs that trigger memory corruption. This flaw directly maps to CWE-787: Out-of-bounds Write, which is classified as a critical weakness in software security. The vulnerability's impact extends beyond simple memory corruption as it enables local privilege escalation, allowing an attacker with minimal privileges to gain system-level execution rights. The exploitation requires no user interaction, making it particularly dangerous as it can be triggered automatically through system processes or malicious applications that can communicate with the aee daemon.
The operational impact of CVE-2022-20099 is severe and far-reaching within Android ecosystems, particularly affecting devices running vulnerable versions of the Android operating system. Attackers can leverage this vulnerability to execute arbitrary code with system-level privileges, potentially leading to complete device compromise and persistent backdoor access. The vulnerability's designation as a local privilege escalation issue means that an attacker who has already gained access to a user account or application context can elevate their privileges to the system level, effectively bypassing all standard security controls. This type of vulnerability aligns with ATT&CK technique T1068: Exploitation for Privilege Escalation, where adversaries exploit software vulnerabilities to gain higher-level permissions. The attack surface is particularly concerning as the aee daemon typically runs with elevated privileges and may be accessible to applications that have been granted system-level permissions, creating multiple potential attack vectors.
Mitigation strategies for CVE-2022-20099 should focus on immediate patch deployment, as the vulnerability has been addressed through the ALPS06296442 patch referenced in the advisory. Organizations should prioritize updating all affected devices to the patched versions, particularly those running Android versions that include the vulnerable aee daemon implementation. System administrators should implement monitoring for unusual activity patterns that might indicate exploitation attempts, focusing on memory access anomalies or unexpected privilege escalation events. Network segmentation and application whitelisting can provide additional defense layers, while regular security audits should verify that the patch has been properly applied and that no residual vulnerabilities remain in the system configuration. The vulnerability also underscores the importance of implementing robust input validation practices and conducting thorough security testing of daemon processes, as these components often operate with elevated privileges and represent critical attack surfaces. Security teams should consider implementing runtime protection mechanisms that can detect and prevent out-of-bounds memory operations, providing an additional layer of defense against similar vulnerabilities that may not yet have patches available.