CVE-2022-34411

Vulnerability

An improper SMM (System Management Mode) communication buffer verification vulnerability exists in Dell PowerEdge BIOS and Dell Precision BIOS. This flaw allows a local malicious user with high privileges to potentially exploit the vulnerability. The affected versions include multiple Dell PowerEdge and Precision systems; specific firmware versions are detailed in the Dell advisory [1].

Exploitation

To exploit this vulnerability, an attacker must have local access to the affected system and possess high privileges (e.g., administrator or root). The attacker can manipulate the SMM communication buffer to trigger arbitrary code execution or denial of service. No user interaction is required beyond gaining the necessary privileges [1].

Impact

Successful exploitation can lead to arbitrary code execution within SMM, which operates at the highest privilege level on the system, or cause a denial of service. This could allow the attacker to bypass security mechanisms, install persistent firmware-level malware, or crash the system [1].

Mitigation

Dell has released firmware updates to address this vulnerability. Users should apply the latest BIOS updates for their respective systems as indicated in the Dell security advisory DSA-2022-204 [1]. No workarounds are provided; updating firmware is the recommended mitigation.