CVE-2022-26426 in MT6833
Summary
by MITRE • 08/01/2022
In camera isp, 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. Patch ID: ALPS07085486; Issue ID: ALPS07085486.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 08/29/2022
The vulnerability identified as CVE-2022-26426 resides within the camera image signal processor component of Android-based devices, representing a critical security flaw that could enable unauthorized privilege escalation. This issue manifests as an out-of-bounds write condition that occurs when the system fails to validate input data boundaries before processing camera-related operations. The flaw exists specifically within the image signal processing subsystem responsible for handling raw image data from camera sensors and converting it into processed visual output. The missing bounds check creates an exploitable memory corruption vulnerability that can be leveraged by malicious actors to execute arbitrary code with elevated privileges. The vulnerability affects devices running Android versions where the affected camera isp component has not been patched, typically impacting the underlying operating system kernel and device driver layers that manage camera functionality.
The technical implementation of this vulnerability stems from inadequate input validation within the camera isp module where buffer boundaries are not properly enforced during data processing operations. When camera input data is processed, the system attempts to write data beyond allocated memory boundaries without proper boundary checks, leading to memory corruption that can overwrite critical system structures. This memory corruption can potentially overwrite function pointers, return addresses, or other critical control data structures within the camera processing pipeline. The flaw operates at the kernel level where camera isp drivers execute with elevated privileges, making the potential impact significantly more severe than typical user-space vulnerabilities. The absence of bounds checking in the image signal processing algorithms creates a predictable pattern that can be exploited through controlled input data manipulation, allowing attackers to manipulate memory layout and execute arbitrary code with system-level privileges.
The operational impact of CVE-2022-26426 extends beyond simple privilege escalation as it provides attackers with a persistent backdoor into affected devices. Once exploited, the vulnerability enables local attackers to gain system execution privileges without requiring user interaction or physical access to the device. This makes the vulnerability particularly dangerous in environments where devices may be compromised through various attack vectors, as the attacker can then leverage this privilege escalation to access all device resources, including encrypted storage, communication channels, and sensitive user data. The vulnerability affects the core camera functionality and can potentially be chained with other exploits to create more sophisticated attack scenarios. The lack of user interaction requirement means that the vulnerability can be exploited automatically when the device processes camera data, making it particularly concerning for mobile devices where camera functionality is frequently accessed. Security researchers have classified this vulnerability according to CWE-787, which specifically addresses out-of-bounds write conditions, and the exploitability aligns with ATT&CK technique T1068, which covers local privilege escalation through kernel exploits.
The recommended mitigation strategy involves applying the vendor-provided patch identified by patch ID ALPS07085486, which addresses the missing bounds check in the camera isp component. Organizations should prioritize updating all affected devices to ensure the security patch is properly installed and verified. System administrators should also implement monitoring solutions to detect potential exploitation attempts and establish baseline security configurations that minimize attack surface. Device manufacturers should conduct thorough security testing of all camera-related components before releasing updates, particularly focusing on input validation and memory boundary checking mechanisms. Additional defensive measures include implementing runtime protections such as stack canaries, address space layout randomization, and memory protection mechanisms that can detect or prevent exploitation attempts. The vulnerability serves as a reminder of the critical importance of proper input validation in kernel-level components and highlights the necessity of comprehensive security testing for all device drivers and system components that handle external data inputs.