CVE-2023-20740 in MT6768
Summary
by MITRE • 06/06/2023
In vcu, there is a possible memory corruption due to a logic error. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07559819; Issue ID: ALPS07559840.
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Analysis
by VulDB Data Team • 01/08/2025
The vulnerability identified as CVE-2023-20740 resides within the vcu component of a system, representing a critical memory corruption issue stemming from a fundamental logic error in the software implementation. This flaw manifests as an improper handling of memory operations that can result in unpredictable behavior when the affected system processes specific inputs or operations. The vulnerability is particularly concerning because it enables local privilege escalation, meaning an attacker with limited system access could potentially elevate their privileges to system level execution rights, thereby gaining complete control over the affected system. The absence of user interaction requirements for exploitation makes this vulnerability especially dangerous as it can be triggered automatically without any deliberate action from the end user, significantly expanding the attack surface and potential impact.
The technical nature of this memory corruption vulnerability aligns with common weaknesses documented in the CWE database, specifically relating to CWE-121, which describes stack-based buffer overflow conditions, and CWE-787, which covers out-of-bounds write operations. These classifications indicate that the underlying flaw likely involves improper bounds checking or memory management operations that allow unauthorized memory access or modification. The vulnerability's exploitation pathway typically involves manipulating input data or system state to cause the program to write beyond allocated memory boundaries or read from invalid memory locations, leading to arbitrary code execution or privilege escalation. The vcu component's role in system operations suggests this vulnerability may be present in hardware or firmware-level processing where memory management is critical and less constrained by traditional software safety mechanisms.
The operational impact of CVE-2023-20740 extends beyond simple privilege escalation as it represents a fundamental weakness in system security architecture that could enable attackers to gain unauthorized access to sensitive system resources, manipulate critical operations, or establish persistent access points. This vulnerability affects the integrity and confidentiality of the system by allowing unauthorized elevation of privileges, potentially enabling attackers to access protected data, modify system configurations, or execute malicious code with elevated privileges. The local escalation of privilege characteristic means that even if an attacker initially gains access through a low-privilege account or compromised service, they can leverage this vulnerability to achieve system-level control. This capability directly maps to several tactics in the MITRE ATT&CK framework under privilege escalation techniques, particularly those involving local system manipulation and credential access. The vulnerability's presence in firmware or hardware components also suggests potential long-term persistence and difficulty in remediation, as these low-level elements often require specialized tools or complete system replacement for effective patching.
The recommended mitigation strategy for CVE-2023-20740 involves applying the vendor-provided patch identified by Patch ID ALPS07559819, which addresses the underlying logic error and memory corruption issue. System administrators should prioritize deployment of this patch across all affected devices, particularly those running the vulnerable vcu component. Additionally, organizations should implement comprehensive monitoring to detect any anomalous system behavior that might indicate exploitation attempts, including unusual privilege escalation activities or memory access patterns. Security teams should conduct thorough vulnerability assessments to identify all systems that may be running the affected vcu component, ensuring complete coverage of the attack surface. Given the local privilege escalation nature of this vulnerability, network segmentation and least privilege access controls should be reinforced to limit potential damage from successful exploitation attempts, though the vulnerability's self-contained nature means that exploitation can occur without network interaction, making local security measures particularly critical. The patch implementation should be followed by verification testing to ensure that the vulnerability has been effectively resolved without introducing regressions in system functionality.