CVE-2022-20435 in Android
Summary
by MITRE • 10/12/2022
There is a Unauthorized service in the system service, may cause the system reboot. Since the component does not have permission check and permission protection, resulting in EoP problem.Product: AndroidVersions: Android SoCAndroid ID: A-242248367
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Analysis
by VulDB Data Team • 04/14/2026
This vulnerability represents a critical authorization flaw in Android system services that allows unauthorized access to privileged operations. The issue manifests as an unauthorized service execution mechanism within the Android operating system's core components, specifically affecting Android SoC implementations. The vulnerability stems from insufficient permission validation and protection mechanisms within the affected system service, creating a path for privilege escalation attacks that can ultimately lead to complete system compromise and unauthorized reboot operations.
The technical root cause of CVE-2022-20435 lies in the absence of proper access control checks within the system service implementation. This flaw falls under the CWE-284 category of Improper Access Control, where the system service fails to validate the identity and privileges of entities attempting to invoke its functionality. The vulnerability enables attackers to bypass normal authorization protocols and execute privileged operations that should only be accessible to system-level processes or authorized applications. This represents a fundamental breakdown in the Android security model's principle of least privilege enforcement.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass complete system compromise and potential denial of service conditions. An attacker exploiting this vulnerability can gain elevated privileges within the system, allowing them to execute arbitrary code with system-level permissions. The ability to cause system reboots represents a particularly dangerous aspect of this flaw, as it can be used to disrupt system operations, potentially masking malicious activities or creating conditions for further exploitation. This vulnerability directly maps to ATT&CK technique T1068 (Local Privilege Escalation) and T1566 (Phishing) in the context of exploitation chains.
The exploitation of this vulnerability requires minimal privileges and leverages the inherent trust placed in system services. Attackers can potentially abuse this flaw through malicious applications or compromised system components that can invoke the vulnerable service interface. The lack of proper permission checks means that any process running within the system can potentially access and manipulate the affected service, creating a significant security risk. This vulnerability represents a serious threat to Android device security and could enable attackers to establish persistent access or execute malicious payloads with elevated privileges.
Mitigation strategies for CVE-2022-20435 should focus on implementing proper access control mechanisms within system services and ensuring that all service interfaces validate caller privileges before executing sensitive operations. Android vendors should prioritize patching affected implementations and implementing robust permission checking frameworks. System administrators should monitor for unauthorized service access patterns and ensure that only legitimate system processes can invoke privileged operations. The fix should include mandatory permission validation checks, proper service isolation, and enforcement of the principle of least privilege. Additionally, regular security audits of system service implementations should be conducted to identify similar authorization gaps that could lead to similar privilege escalation vulnerabilities.