CVE-2022-42528 in Android
Summary
by MITRE • 03/24/2023
In ffa_mrd_prot of shared_mem.c, there is a possible ID due to a logic error in the code. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-242203672References: N/A
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Analysis
by VulDB Data Team • 04/14/2023
The vulnerability identified as CVE-2022-42528 resides within the Android kernel's shared memory management subsystem, specifically in the ffa_mrd_prot function located in shared_mem.c. This flaw represents a logic error that fundamentally compromises the integrity of memory protection mechanisms within the Trusted Execution Environment. The issue manifests as an information disclosure vulnerability that occurs when the kernel fails to properly validate memory region protections during certain memory management operations. The vulnerability's classification as a logic error places it under CWE-697, which deals with incorrect comparison operations that can lead to unexpected behavior and security implications. The affected component operates at a low level within the kernel, making the vulnerability particularly concerning as it can expose sensitive data that should remain protected within secure memory regions.
The operational impact of this vulnerability extends beyond simple information disclosure, as it demonstrates a failure in the kernel's memory protection mechanisms that could potentially enable attackers to access memory regions that should be restricted. The vulnerability does not require any additional execution privileges, meaning that any local user or process with basic access to the system could exploit this flaw. The absence of user interaction requirements makes this vulnerability particularly dangerous as it can be triggered automatically without any deliberate action from the attacker. This characteristic aligns with ATT&CK technique T1059, where adversaries leverage system-level vulnerabilities to gain unauthorized access to protected information. The exploitation process likely involves manipulating memory management operations to bypass protection checks, potentially exposing kernel memory contents or sensitive data structures that should remain confidential.
The technical nature of this vulnerability suggests that it involves a flaw in how the kernel handles memory region protection flags or access control mechanisms within the Firmware Framework Architecture (FFA) implementation. When the ffa_mrd_prot function processes memory management requests, it fails to properly validate the integrity of protection parameters, allowing for potential bypass of access controls. This logic error could result in memory regions being accessible when they should remain protected, creating opportunities for information leakage that could include sensitive kernel data, cryptographic keys, or other confidential information. The vulnerability's impact is further amplified by the fact that it exists within the kernel's shared memory management layer, which serves as a critical interface between different security domains and memory management components. The Android ID A-242203672 indicates this vulnerability was recognized and tracked by Google's security team, emphasizing its significance within the Android ecosystem and the potential for widespread impact across various Android devices and kernel versions.