CVE-2022-34422 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-2022-34422 affects Dell PowerEdge and Dell Precision BIOS implementations, representing a critical flaw in the System Management Mode communication mechanisms. This issue stems from inadequate verification of SMM communication buffers, creating a pathway for privilege escalation attacks that could ultimately lead to system compromise. The vulnerability resides within the firmware layer where System Management Mode operates, making it particularly dangerous as it executes with the highest privilege level and operates outside the normal operating system execution environment.
The technical root cause of this vulnerability lies in the improper validation of communication buffers used during SMM interactions. When the BIOS handles requests from the operating system or other firmware components, it fails to properly verify the integrity and boundaries of memory buffers used for SMM communication. This allows an attacker with high privileges to manipulate buffer contents and potentially execute arbitrary code within the SMM context. The flaw represents a classic buffer over-read or buffer under-read condition that violates fundamental memory safety principles and aligns with CWE-129, which addresses improper validation of buffer boundaries.
From an operational perspective, this vulnerability creates significant risks for enterprise environments that rely on Dell PowerEdge and Precision systems. The attack vector requires a local malicious user with high privileges, which means that the system must already be compromised or the attacker must have achieved a foothold through other means. However, once exploited, the vulnerability can result in complete system compromise as SMM operates with unrestricted access to system hardware and memory. The potential for denial of service exists as well, where the malicious code execution could destabilize system operations or cause permanent hardware damage through improper memory manipulation. This vulnerability directly impacts the integrity of the system firmware and can undermine the security of the entire computing platform.
Organizations should implement immediate mitigation strategies including applying the latest BIOS updates from Dell that address the SMM communication buffer verification issue. The vulnerability's impact is exacerbated in environments where privileged accounts are compromised, making comprehensive access controls and privileged access management essential. System administrators should also consider implementing runtime monitoring solutions that can detect anomalous SMM activity patterns and provide early warning of potential exploitation attempts. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the system firmware as a persistent attack surface. Regular firmware integrity checks and hardware security module implementations can provide additional protection layers against such low-level exploits that operate below the operating system level and are notoriously difficult to detect through traditional security mechanisms.