CVE-2022-20255 in Android
Summary
by MITRE • 08/12/2022
In SettingsProvider, there is a possible way to read or change the default ringtone due to a missing permission 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-13Android ID: A-222687217
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Analysis
by VulDB Data Team • 09/11/2022
The vulnerability identified as CVE-2022-20255 resides within the SettingsProvider component of Android 13 operating systems, representing a critical security flaw that enables unauthorized privilege escalation. This issue manifests through a missing permission check within the SettingsProvider framework, which governs system-wide settings management and configuration. The vulnerability specifically affects the handling of default ringtone configurations, creating an exploitable condition that allows malicious actors to manipulate system audio settings without proper authorization. The absence of adequate permission validation creates a pathway for attackers to gain elevated privileges on the device, fundamentally compromising the security model of the Android operating system.
The technical implementation of this vulnerability stems from insufficient access controls within the SettingsProvider service, which is responsible for managing various system settings including audio configurations. When a malicious application attempts to modify or read the default ringtone settings, the system fails to properly validate whether the requesting process possesses the necessary permissions to perform such operations. This missing permission check creates a direct attack vector that bypasses the normal Android security boundaries, allowing applications with minimal privileges to access and modify sensitive system settings. The flaw operates at the system level where the SettingsProvider service should enforce strict access controls, but instead permits unauthorized modifications to system audio configurations.
The operational impact of CVE-2022-20255 extends beyond simple audio setting manipulation, as it provides a mechanism for local privilege escalation that requires no additional execution privileges or user interaction. This means that any application running on the device can exploit this vulnerability to gain elevated privileges, effectively undermining the entire Android security architecture. The implications are particularly severe because the attack can be executed silently without any user awareness or consent, making it extremely difficult to detect and prevent. Attackers can leverage this vulnerability to install malicious applications, modify system files, or gain access to sensitive user data that would normally be protected by Android's permission model. The lack of user interaction requirement significantly increases the exploitability of this vulnerability in real-world scenarios.
This vulnerability aligns with CWE-284 which addresses improper access control, specifically within the context of Android's system-level security mechanisms. The flaw represents a classic example of insufficient privilege checking where the SettingsProvider component fails to properly enforce Android's security model. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques under the T1068 category, enabling adversaries to gain elevated privileges without requiring additional attack vectors. The vulnerability also relates to T1547 which covers registry run keys and startup folder modifications, as the ability to modify system settings could potentially be used to establish persistence mechanisms. Organizations and users must understand that this vulnerability creates a fundamental weakness in Android's security architecture, where the integrity of system settings management is compromised.
Mitigation strategies for CVE-2022-20255 require immediate patching of affected Android 13 devices through official security updates provided by Google and device manufacturers. System administrators should ensure that all Android devices are updated to the latest security patches, particularly focusing on the SettingsProvider component and related system services. Additional protective measures include implementing mobile device management solutions that can monitor for unauthorized system setting modifications, establishing network monitoring protocols to detect suspicious activities related to system configuration changes, and conducting regular security audits of applications that may attempt to access system settings. Organizations should also consider implementing application whitelisting policies that restrict which applications can access system configuration services, and maintain comprehensive logging of system setting modifications to enable rapid detection of potential exploitation attempts. The vulnerability highlights the critical importance of maintaining up-to-date security patches and reinforces the need for continuous security monitoring in mobile environments.