CVE-2024-33656 in AptioV
Summary
by MITRE • 08/21/2024
The DXE module SmmComputrace contains a vulnerability that allows local attackers to leak stack or global memory. This could lead to privilege escalation, arbitrary code execution, and bypassing OS security mechanisms
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Analysis
by VulDB Data Team • 08/22/2024
The vulnerability identified as CVE-2024-33656 resides within the DXE module SmmComputrace which operates at the System Management Mode level of system firmware. This represents a critical security flaw that fundamentally undermines the integrity of the platform's security architecture. The vulnerability manifests as improper memory handling within the SmmComputrace module, creating potential information disclosure pathways that could be exploited by local attackers with minimal privileges. The affected module is part of the broader firmware ecosystem that manages system-level operations and security policies, making its compromise particularly dangerous as it operates outside the normal operating system security boundaries.
The technical flaw stems from inadequate memory protection mechanisms within the DXE module, specifically in how it handles stack and global memory regions. This vulnerability falls under CWE-248, which addresses "Uncaught Exception" conditions in software systems, and more specifically relates to improper handling of memory management within firmware components. The flaw allows attackers to perform memory disclosure attacks that can reveal sensitive information stored in stack memory or global variables, potentially exposing cryptographic keys, security tokens, or other critical system data. The vulnerability's nature suggests that the module lacks proper bounds checking and memory access validation during its operation, creating exploitable pathways for information leakage.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it creates a foundation for more severe security breaches. Local attackers who can trigger the vulnerability may leverage the leaked memory information to perform privilege escalation attacks, potentially gaining elevated system privileges that would normally be restricted. This could enable attackers to execute arbitrary code with system-level privileges, effectively bypassing all operating system security mechanisms and controls. The implications are particularly severe given that the module operates in System Management Mode, which typically has the highest privilege level and can circumvent standard operating system protections. The vulnerability essentially creates a backdoor for attackers to bypass the normal security model of the system.
Mitigation strategies for CVE-2024-33656 must address both immediate and long-term security concerns. System administrators should prioritize firmware updates from vendors as soon as patches become available, as this vulnerability requires modifications to the firmware level to properly address the memory handling flaws. The mitigation approach should align with ATT&CK technique T1068, which covers "Local Privilege Escalation," as the vulnerability creates opportunities for attackers to escalate their privileges through memory manipulation. Organizations should implement comprehensive firmware integrity monitoring solutions and establish strict change management processes for firmware updates. Additionally, security teams should consider implementing runtime protection measures that can detect anomalous memory access patterns and potential exploitation attempts. The vulnerability's nature suggests that defensive measures should focus on monitoring and protecting memory access within SMM modules, as these represent critical attack surfaces that require specialized security controls beyond traditional operating system protections.