CVE-2022-34412 in PowerEdge BIOS
Summary
by MITRE • 03/16/2023
Dell PowerEdge BIOS and Dell Precision BIOS contain an Improper SMM communication buffer verification vulnerability. A local malicious user with high Privileges may potentially exploit this vulnerability to perform arbitrary code execution or cause denial of service.
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Analysis
by VulDB Data Team • 04/08/2023
The vulnerability identified as CVE-2022-34412 affects Dell PowerEdge BIOS and Dell Precision BIOS implementations, representing a critical weakness in the System Management Mode communication mechanisms. This flaw resides in the firmware layer where the System Management Mode handles critical system functions and security operations. The issue stems from inadequate verification of communication buffers used between the operating system and the System Management Controller, creating a potential attack vector for privilege escalation. According to CWE-121, this vulnerability falls under the category of Stack-based Buffer Overflow, specifically manifesting as improper buffer validation during SMM interactions. The vulnerability impacts systems where the BIOS fails to properly validate buffer boundaries and memory access permissions when processing SMM communication requests.
The technical exploitation of this vulnerability occurs through improper verification of SMM communication buffers, which allows for manipulation of memory regions that should remain protected. An attacker with high privileges can craft malicious SMM communication requests that bypass normal buffer validation checks, potentially leading to arbitrary code execution within the SMM context. This represents a significant threat because SMM operates with the highest privilege level and can execute code before the operating system fully initializes, making it an attractive target for attackers seeking persistent access. The flaw enables a malicious user to execute code with system-level privileges, potentially compromising the entire system architecture. The vulnerability is classified under ATT&CK technique T1068, which addresses local privilege escalation through kernel or system-level vulnerabilities, and specifically aligns with T1543.003 for establishing persistence through system services or firmware modifications.
The operational impact of CVE-2022-34412 extends beyond simple privilege escalation to include potential system instability and complete compromise of the affected infrastructure. Systems utilizing affected Dell BIOS versions may experience denial of service conditions when the vulnerable SMM communication buffers are improperly handled, leading to system crashes or boot failures. The attack surface is particularly concerning for enterprise environments where Dell PowerEdge servers are commonly deployed, as these systems often serve as critical infrastructure components. Organizations may face significant risks including unauthorized data access, system compromise, and potential lateral movement within their network. The vulnerability affects systems that rely on proper SMM buffer handling for secure firmware operations, making it particularly dangerous in environments where firmware integrity is paramount for security.
Mitigation strategies for this vulnerability require immediate firmware updates from Dell to address the SMM communication buffer verification issues. Organizations should prioritize patching all affected Dell PowerEdge and Precision systems with the latest BIOS versions released by Dell. The implementation of firmware integrity monitoring solutions can help detect unauthorized modifications to the BIOS components. Network segmentation and privilege access controls should be enforced to limit potential exploitation opportunities for local malicious users. System administrators should implement monitoring for unusual SMM activity and unauthorized firmware modifications. Additionally, organizations should consider implementing hardware security modules or trusted platform modules to enhance firmware integrity protection. The vulnerability demonstrates the importance of proper buffer validation in firmware environments and underscores the need for continuous security assessment of system management components. Regular firmware audits and security assessments should be conducted to identify similar vulnerabilities in other system management interfaces and ensure comprehensive protection against firmware-based attacks.