CVE-2023-20722 in MT6765
Summary
by MITRE • 05/16/2023
In m4u, there is a possible out of bounds write due to improper input validation. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07771518; Issue ID: ALPS07680084.
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Analysis
by VulDB Data Team • 01/25/2025
The vulnerability identified as CVE-2023-20722 resides within the m4u component of a system, representing a critical out-of-bounds write flaw that stems from inadequate input validation mechanisms. This issue manifests in the form of improper boundary checking during data processing, where the system fails to adequately validate the size or content of input parameters before writing to memory locations. The vulnerability is particularly concerning as it enables local privilege escalation, allowing an attacker with system execution privileges to potentially gain elevated access rights and execute malicious code with higher privileges than initially granted.
The technical implementation of this flaw involves memory corruption through buffer overruns where the m4u module does not properly verify input boundaries before performing write operations. This type of vulnerability falls under the CWE-787 category of out-of-bounds write conditions, which represents a well-documented weakness in software security that has been consistently exploited in various attack scenarios. The absence of proper input sanitization means that maliciously crafted data can cause the program to write beyond allocated memory regions, potentially overwriting critical system structures or executable code.
The operational impact of CVE-2023-20722 extends beyond simple memory corruption, as it creates a pathway for privilege escalation that could allow attackers to execute arbitrary code with elevated privileges. This vulnerability does not require user interaction for exploitation, making it particularly dangerous as it can be triggered automatically by malicious processes or through compromised system components. The fact that it requires system execution privileges for exploitation suggests that it operates at a low-level system interface where legitimate system processes can be leveraged to carry out the attack, potentially through kernel-mode operations or privileged system calls.
Security professionals should recognize this vulnerability as a potential candidate for exploitation within the ATT&CK framework under the privilege escalation category, specifically targeting the system's memory management subsystem. The patch ID ALPS07771518 and issue ID ALPS07680084 indicate that this vulnerability was addressed through a specific firmware or system update, emphasizing the need for timely patch management across affected systems. Organizations should implement comprehensive monitoring for anomalous system behavior that could indicate exploitation attempts, particularly focusing on memory access patterns and privilege escalation events.
Mitigation strategies should include immediate deployment of the vendor-provided patch, implementation of input validation controls at multiple system layers, and enhanced monitoring of system calls related to memory management. The vulnerability's nature suggests that defensive measures should focus on preventing buffer overflows through proper bounds checking, stack canaries, and address space layout randomization techniques. Additionally, system administrators should conduct thorough security assessments to identify any potential exploitation attempts and establish baseline system behavior for anomaly detection purposes.