CVE-2022-22558 in PowerEdge Server BIOS
Summary
by MITRE • 04/22/2022
Dell PowerEdge Server BIOS contains an Improper SMM communication buffer verification vulnerability. A Local High Privileged attacker could potentially exploit this vulnerability leading to arbitrary writes or denial of service.
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Analysis
by VulDB Data Team • 04/28/2022
The CVE-2022-22558 vulnerability resides within the Dell PowerEdge Server BIOS implementation and represents a critical flaw in the System Management Mode communication mechanisms. This vulnerability specifically targets the verification processes that govern how data flows between the System Management Mode and the operating system, creating a potential attack surface that could be exploited by malicious actors with elevated privileges. The issue manifests as an improper verification of SMM communication buffers, which are critical components that facilitate low-level system operations and hardware management functions. Such buffers serve as intermediaries for sensitive system operations that occur outside the normal execution context of the operating system, making their security paramount to overall system integrity.
The technical nature of this vulnerability stems from insufficient validation of buffer boundaries and memory access controls within the SMM communication pathways. When the BIOS processes data from the SMM environment, it fails to properly verify the integrity and boundaries of communication buffers, potentially allowing an attacker to manipulate memory contents or cause system instability. This flaw operates at a fundamental level of system security where the distinction between trusted and untrusted code becomes blurred, particularly when considering that SMM operates with the highest privilege levels and can directly interact with hardware components. The vulnerability's classification as a local high privileged attack vector indicates that exploitation requires existing elevated access, but this access level is typically sufficient to bypass standard operating system protections and gain control over critical system functions.
The operational impact of CVE-2022-22558 extends beyond simple denial of service scenarios to encompass potential arbitrary code execution capabilities that could compromise entire server environments. An attacker with local high privileges could leverage this vulnerability to write arbitrary data to critical system memory locations, potentially modifying boot processes, altering system configurations, or injecting malicious code that persists across system reboots. This capability directly violates the principle of least privilege and could enable attackers to establish persistent backdoors or escalate their privileges further within the system. The vulnerability affects Dell PowerEdge server models that utilize affected BIOS versions, creating widespread exposure across enterprise environments where these servers are commonly deployed. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence mechanisms, specifically targeting the system's firmware integrity and memory protection controls.
Mitigation strategies for CVE-2022-22558 should prioritize immediate BIOS updates from Dell to address the underlying verification flaws in SMM communication buffer handling. Organizations should implement strict access controls and monitor for unauthorized local access to affected systems, as the vulnerability requires existing elevated privileges to exploit effectively. Network segmentation and privilege minimization practices can help reduce the potential impact of successful exploitation attempts. The vulnerability aligns with CWE-129, which addresses improper validation of buffer boundaries, and represents a critical weakness in firmware security that requires immediate attention from system administrators and security teams. Regular firmware inventory management and automated patch deployment processes should be established to prevent similar vulnerabilities from remaining unaddressed in production environments.