CVE-2022-20063 in MT6765
Summary
by MITRE • 04/12/2022
In atf (spm), 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 needed for exploitation. Patch ID: ALPS06171715; Issue ID: ALPS06171715.
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Analysis
by VulDB Data Team • 04/17/2022
The vulnerability identified as CVE-2022-20063 resides within the atf (spm) component, representing a critical out-of-bounds write flaw that stems from inadequate input validation mechanisms. This issue manifests when the system fails to properly verify array boundaries during memory operations, creating a scenario where malicious input can overwrite adjacent memory locations. The vulnerability is classified as a local privilege escalation vector requiring system execution privileges for initial access, though the exploitation process necessitates user interaction to trigger the vulnerable code path. The flaw specifically impacts the spm module within the atf framework, suggesting this is part of a broader software stack that handles system management or provisioning operations.
The technical implementation of this vulnerability aligns with CWE-787, which describes out-of-bounds write conditions that occur when a program writes to memory beyond the allocated buffer boundaries. This type of flaw typically arises from insufficient bounds checking in memory management operations, where developers fail to validate input parameters against buffer limits before performing write operations. The missing bounds check creates a predictable attack surface where an attacker can manipulate input data to overwrite critical memory regions, potentially including return addresses, function pointers, or privilege control structures. The vulnerability's classification as requiring system execution privileges indicates that it operates within a privileged execution context, making the potential impact significantly more severe than typical user-level flaws.
From an operational perspective, this vulnerability presents a substantial risk for local privilege escalation attacks, where an attacker with basic user privileges could potentially elevate their access level to system administrator status. The requirement for user interaction suggests that exploitation would likely involve social engineering or tricking a user into executing malicious code or providing crafted input to a vulnerable application. The patch identifier ALPS06171715 indicates this is a vendor-specific fix for a Linux-based system management framework, with the issue being tracked under a specific internal tracking system. The fact that this vulnerability requires system execution privileges for initial access suggests it may be part of a multi-stage attack vector where the initial compromise occurs through other means before leveraging this specific flaw for privilege escalation.
The mitigation strategy for CVE-2022-20063 should prioritize immediate deployment of the vendor-provided patch ALPS06171715, which addresses the missing bounds check in the atf spm module. System administrators should implement comprehensive input validation controls to prevent similar vulnerabilities from emerging in other components of the system management stack. Security monitoring should focus on detecting anomalous memory access patterns and potential privilege escalation attempts that might indicate exploitation attempts. The vulnerability's nature suggests implementing defensive programming practices including bounds checking, memory sanitization, and stack canaries to prevent similar out-of-bounds write conditions. Organizations should also consider implementing principle of least privilege controls and regular security assessments of system management components to identify and remediate similar vulnerabilities before they can be exploited in operational environments. This flaw demonstrates the critical importance of rigorous code review processes and automated testing for memory safety issues within system management frameworks that operate with elevated privileges.