CVE-2022-20087 in MT6833
Summary
by MITRE • 05/04/2022
In ccu, 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: ALPS06477970; Issue ID: ALPS06477970.
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Analysis
by VulDB Data Team • 05/07/2022
The vulnerability identified as CVE-2022-20087 resides within the ccu component of a system, representing a critical out-of-bounds write flaw that stems from inadequate input validation mechanisms. This particular vulnerability manifests when the system fails to perform proper bounds checking on data processing operations, creating an exploitable condition where malicious data can overwrite adjacent memory regions beyond the intended buffer boundaries. The absence of such fundamental security checks creates a pathway for unauthorized privilege escalation, as the flaw specifically enables local users to elevate their execution privileges to system level without requiring any form of user interaction or external stimuli for successful exploitation. The vulnerability's classification as a local privilege escalation issue indicates that an attacker with existing system access can leverage this flaw to gain elevated privileges, potentially leading to complete system compromise.
The technical nature of this vulnerability aligns with CWE-787, which specifically addresses out-of-bounds write conditions in software systems. This flaw operates at the memory management level where insufficient validation of buffer limits allows arbitrary data to be written beyond allocated memory segments, potentially corrupting critical system structures or overwriting executable code. The exploitation process requires the attacker to already possess a valid system account or access level, but once achieved, the vulnerability provides a direct path to system-level execution privileges. The patch identifier ALPS06477970 specifically addresses this issue through targeted code modifications that implement proper bounds checking mechanisms and memory validation procedures. This vulnerability demonstrates the critical importance of defensive programming practices and the necessity of implementing robust input validation across all system components, particularly those handling user-supplied data or system configuration parameters.
From an operational security perspective, this vulnerability presents a significant risk to organizations relying on affected systems, as it enables unauthorized privilege escalation without user interaction requirements. The lack of user interaction makes this flaw particularly dangerous as it can be exploited automatically, potentially allowing attackers to establish persistent system-level access. The vulnerability's impact extends beyond simple privilege escalation, as successful exploitation can provide attackers with complete control over system operations, data access, and potential lateral movement within network environments. Security teams must prioritize immediate patch deployment to address this vulnerability, as the absence of user interaction requirements means that exploitation can occur without detection or user awareness. This vulnerability also highlights the importance of maintaining up-to-date security patches and implementing comprehensive vulnerability management processes to prevent exploitation of known security flaws.
The mitigation strategy for CVE-2022-20087 primarily focuses on applying the vendor-provided patch ALPS06477970 which addresses the missing bounds check implementation within the ccu component. Organizations should also implement additional defensive measures including regular security assessments, enhanced monitoring for unusual privilege escalation activities, and comprehensive system hardening procedures. The vulnerability's characteristics align with ATT&CK technique T1068, which involves the exploitation of system vulnerabilities for privilege escalation purposes, making it essential for security operations teams to monitor for potential exploitation attempts. System administrators should also consider implementing principle of least privilege controls and regular access reviews to minimize potential impact from successful exploitation attempts. The patch implementation process should include thorough testing procedures to ensure compatibility and prevent unintended system disruptions while maintaining security integrity.