CVE-2024-33657 in AptioV
Summary
by MITRE • 08/21/2024
This SMM vulnerability affects certain modules, allowing privileged attackers to execute arbitrary code, manipulate stack memory, and leak information from SMRAM to kernel space, potentially leading to denial-of-service attacks.
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Analysis
by VulDB Data Team • 08/22/2024
The vulnerability identified as CVE-2024-33657 represents a critical flaw within the System Management Mode (SMM) subsystem of affected systems, creating a significant security risk that transcends traditional operating system boundaries. SMM is a privileged execution environment that operates outside the normal operating system context, designed to handle critical system functions such as power management, hardware initialization, and system recovery. This vulnerability specifically targets modules within the SMM framework, creating a pathway for attackers to gain unauthorized access to this highly privileged execution context. The flaw manifests as a weakness that allows adversaries with sufficient privileges to execute arbitrary code within SMM, effectively bypassing standard operating system security controls and protections that normally safeguard system integrity.
The technical nature of this vulnerability involves sophisticated memory manipulation capabilities that enable attackers to manipulate stack memory within the SMM environment. This type of vulnerability falls under the category of SMM stack corruption or memory management flaws, which are particularly dangerous because they occur in a privileged execution context where normal security mechanisms are disabled or bypassed. The ability to manipulate stack memory within SMM provides attackers with the capability to overwrite critical data structures, inject malicious code into the SMM execution environment, and potentially gain complete control over the system's hardware-level operations. Such memory corruption vulnerabilities are often classified under CWE-121 for stack-based buffer overflow conditions, though the specific implementation details of this vulnerability may involve more complex memory management issues.
The operational impact of CVE-2024-33657 extends far beyond simple code execution capabilities, as it enables information leakage from SMRAM (System Management Random Access Memory) to kernel space, creating a sophisticated attack vector that can be leveraged for multiple malicious purposes. SMRAM represents a protected memory region that contains sensitive system information and code that should remain isolated from normal system operations, making any unauthorized access to this memory space particularly concerning. The leakage of information from SMRAM to kernel space creates a potential information disclosure threat that could expose critical system data, including cryptographic keys, system configuration details, and other sensitive information that could be used to further compromise system security. This information leakage capability, combined with the code execution ability, creates a complete attack chain that can be exploited to establish persistent access to target systems and potentially escalate privileges to the highest system levels.
The potential for denial-of-service attacks represents one of the most immediate and concerning aspects of this vulnerability, as attackers can leverage the SMM access to disrupt critical system functions and render systems inoperable. This denial-of-service capability can be achieved through various methods including stack corruption that causes SMM modules to crash, memory corruption that prevents proper system initialization, or by manipulating hardware state information that critical system functions depend upon. The impact extends beyond simple service interruption to potentially creating system instability that could result in complete system failure or forced reboots. The vulnerability's classification aligns with ATT&CK techniques that involve system service manipulation and privilege escalation, as attackers can use this flaw to gain access to the most privileged execution environment on the system and potentially disrupt critical system services through manipulation of SMM modules.
Mitigation strategies for CVE-2024-33657 require a multi-layered approach that addresses both the immediate vulnerability and the broader security implications of SMM-based attacks. System administrators should implement firmware updates from vendors as soon as available, as these updates typically contain patches for known SMM vulnerabilities and may include enhanced memory protection mechanisms. Additionally, organizations should consider implementing SMM memory protection features such as SMRAM cache control and memory encryption capabilities that can prevent unauthorized access to sensitive memory regions. The implementation of runtime monitoring solutions that can detect anomalous SMM activity or memory access patterns represents another important mitigation strategy, as these systems can identify potential exploitation attempts before they can cause significant damage. Furthermore, organizations should conduct thorough security assessments of their systems to identify any potential SMM-based attack vectors and implement network segmentation to limit the potential impact of successful exploitation attempts. The vulnerability's nature suggests that traditional operating system security controls may be insufficient to protect against attacks exploiting this flaw, making it essential to implement hardware-level protections and firmware-level security measures that can provide defense-in-depth against SMM-based threats.