CVE-2023-20657 in MT6580
Summary
by MITRE • 04/06/2023
In mtee, 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: ALPS07571485; Issue ID: ALPS07571485.
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Analysis
by VulDB Data Team • 08/29/2025
The vulnerability identified as CVE-2023-20657 affects the mtee component within Android systems, representing a critical out-of-bounds write flaw that can potentially enable local privilege escalation. This issue stems from a fundamental missing bounds check within the mtee implementation, creating a pathway for malicious code execution with system-level privileges. The vulnerability exists in the underlying kernel or system-level component that handles mtee operations, which are typically used for managing memory and thread execution contexts within the Android operating system.
The technical nature of this flaw places it squarely within CWE-129, which addresses improper validation of array indices and other bounds checking issues. The missing bounds check allows an attacker to write data beyond the allocated memory boundaries of the mtee component, potentially overwriting critical system structures or executable code. This type of vulnerability is particularly dangerous because it requires no user interaction for exploitation, making it an ideal candidate for automated attacks or exploitation within compromised environments. The vulnerability's classification as a local privilege escalation means that an attacker with minimal privileges could leverage this flaw to gain system-level access, effectively bypassing standard security boundaries.
The operational impact of CVE-2023-20657 extends beyond simple memory corruption, as it provides a direct path to system compromise through privilege escalation. Attackers could exploit this vulnerability to execute arbitrary code with kernel-level privileges, potentially enabling them to modify system files, install persistent backdoors, or completely compromise device integrity. The lack of user interaction requirement makes this vulnerability particularly concerning for mobile devices, as it can be exploited automatically without requiring user engagement or specific conditions. This characteristic aligns with ATT&CK technique T1068, which covers 'Local Privilege Escalation' through the exploitation of system vulnerabilities.
The patch referenced as ALPS07571485 addresses this vulnerability by implementing proper bounds checking mechanisms within the mtee component. This fix ensures that all memory operations within the mtee context properly validate array indices and memory boundaries before executing write operations. The patch demonstrates the importance of defensive programming practices and proper input validation, which are fundamental requirements for maintaining system security. Organizations should prioritize applying this patch immediately, as the vulnerability represents a significant risk to device security and system integrity. The vulnerability's nature suggests that it may be present in multiple Android versions and device implementations, making widespread patching essential for comprehensive protection against potential exploitation attempts.