CVE-2022-34413

Vulnerability

CVE-2022-34413 is an Improper SMM communication buffer verification vulnerability residing in the BIOS of Dell PowerEdge servers and Dell Precision workstations. The bug is triggered during System Management Mode (SMM) communication handling, where the firmware fails to properly validate the communication buffer. This affects specific BIOS versions as detailed in Dell advisory DSA-2022-204 [1].

Exploitation

To exploit this vulnerability, an attacker must already have high privileges (e.g., Administrator or SYSTEM access) on the targeted system and must be able to execute code locally. The attacker then crafts a malicious SMM communication request that bypasses the buffer verification, allowing the injection of arbitrary data into SMRAM. The exploitation requires precise knowledge of the SMI handler interface and the vulnerable buffer structures [1].

Impact

Successful exploitation of CVE-2022-34413 can lead to arbitrary code execution within System Management Mode (SMM), which operates at the highest privilege level on x86 platforms. This would allow the attacker to bypass OS-level security controls, install persistent firmware implants, or cause a denial of service by corrupting critical SMM data. The CVSS v3.1 base score for this specific CVE is 7.5 (High), with the vector AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H [1].

Mitigation

Dell released firmware updates to address CVE-2022-34413 as part of DSA-2022-204. Affected users should update their BIOS to the fixed versions listed in the advisory for each Dell PowerEdge and Precision model [1]. No workarounds are provided; applying the patch is the only known mitigation. This CVE is not listed on the CISA Known Exploited Vulnerabilities (KEV) catalog as of the publication date.