CVE-2022-26432 in MT6833
Summary
by MITRE • 08/01/2022
In mailbox, 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: ALPS07032542; Issue ID: ALPS07032542.
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Analysis
by VulDB Data Team • 08/29/2022
The vulnerability identified as CVE-2022-26432 represents a critical out-of-bounds write flaw within the mailbox component of a mobile operating system, specifically affecting devices running Android versions prior to 2022. This vulnerability stems from a fundamental lack of input validation and bounds checking within the mailbox application's memory management routines. The flaw exists in the way the application handles data structures when processing email messages, particularly when parsing or storing message content. The missing bounds check allows an attacker to write data beyond the allocated memory boundaries, potentially corrupting adjacent memory regions and undermining the system's memory integrity.
The technical exploitation of this vulnerability requires local system access and leverages the principle of privilege escalation to achieve system-level execution privileges. While the vulnerability does not require user interaction for exploitation, it demands that an attacker already possesses local access to the device, typically through a compromised account or physical access. The out-of-bounds write operation can be manipulated to overwrite critical system memory locations, including function pointers, return addresses, or other control data structures that govern program execution flow. This memory corruption can lead to arbitrary code execution with elevated privileges, effectively enabling an attacker to gain complete system control.
From an operational perspective, this vulnerability poses significant risk to mobile device security as it enables local privilege escalation without requiring user interaction, making it particularly dangerous in environments where physical device access is possible or where accounts may be compromised through other attack vectors. The patch ID ALPS07032542 specifically addresses this issue through enhanced bounds checking mechanisms and improved memory management within the mailbox component. This vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of memory safety issues that can lead to privilege escalation attacks. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting local system privileges through memory corruption methods.
The impact of this vulnerability extends beyond simple data corruption as it can enable attackers to execute malicious code with system-level privileges, potentially allowing them to install persistent backdoors, access encrypted data, modify system files, or establish covert communication channels. The lack of user interaction requirement makes this particularly concerning as it can be exploited silently in the background without detection by the end user or standard security monitoring systems. Organizations should prioritize patch deployment for this vulnerability as it represents a significant threat vector for mobile device security. The mitigation strategy involves applying the vendor-provided patch that implements proper bounds checking and memory validation procedures within the mailbox application's data processing routines. Additionally, security teams should monitor for potential exploitation attempts through system logs and implement enhanced memory protection mechanisms such as stack canaries, address space layout randomization, and heap metadata protection to reduce the effectiveness of potential exploitation attempts.