CVE-2022-42513 in Android
Summary
by MITRE • 12/16/2022
In ProtocolEmbmsBuilder::BuildSetSession of protocolembmsbuilder.cpp, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-241763204References: N/A
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Analysis
by VulDB Data Team • 04/18/2025
The vulnerability identified as CVE-2022-42513 resides within the Android kernel's ProtocolEmbmsBuilder component, specifically in the BuildSetSession method of the protocolembmsbuilder.cpp file. This represents a critical security flaw that could potentially enable local privilege escalation to system-level privileges without requiring user interaction for exploitation. The vulnerability manifests as an out-of-bounds write condition that occurs due to the absence of proper bounds checking mechanisms within the implementation.
The technical flaw stems from insufficient input validation and boundary verification within the ProtocolEmbmsBuilder::BuildSetSession function. When processing certain protocol messages related to embedded multimedia broadcasting and streaming, the code fails to validate array indices or buffer limits before performing write operations. This missing bounds check creates an opportunity for malicious code to write data beyond the allocated memory boundaries, potentially corrupting adjacent memory regions or overwriting critical system structures. The vulnerability is particularly concerning because it operates within the Android kernel space where it can leverage existing system execution privileges to achieve privilege escalation.
From an operational impact perspective, this vulnerability could enable attackers with local access to escalate their privileges from regular user level to system level execution. The lack of user interaction requirement means that exploitation could occur automatically when the vulnerable system processes specific protocol data, making it particularly dangerous in environments where local access is possible. The out-of-bounds write condition could lead to system instability, arbitrary code execution, or complete system compromise depending on how the memory corruption affects system operations. This vulnerability directly impacts the integrity and confidentiality of Android devices running affected kernel versions.
The vulnerability maps to CWE-787 Out-of-bounds Write within the Common Weakness Enumeration framework, which specifically addresses situations where code writes to memory locations beyond the boundaries of allocated buffers. This weakness typically occurs when developers fail to validate input parameters or array indices before performing memory operations. From an ATT&CK perspective, this vulnerability aligns with T1068 Privilege Escalation techniques, specifically targeting system-level privilege escalation through kernel exploitation. The attack vector represents a local privilege escalation opportunity that could be leveraged by malware or malicious applications with local execution capabilities to gain unauthorized system access.
Mitigation strategies should include applying the latest Android security patches and kernel updates provided by device manufacturers. Organizations should implement comprehensive monitoring for unusual system behavior that might indicate memory corruption or privilege escalation attempts. The implementation of additional input validation layers and bounds checking mechanisms within similar protocol processing functions can help prevent similar vulnerabilities from occurring. Device manufacturers should conduct thorough code reviews and security testing of kernel components, particularly those handling protocol parsing and message processing. Regular security assessments and vulnerability scanning should be performed to identify and remediate similar out-of-bounds write conditions across the system architecture.