CVE-2022-34415

Vulnerability

CVE-2022-34415 is an improper System Management Mode (SMM) communication buffer verification vulnerability in the BIOS of Dell PowerEdge and Dell Precision systems. The issue resides in the SMM handler code, where insufficient validation of communication buffers may allow a local attacker with high privileges to craft malicious input. The affected versions are those covered by Dell advisory DSA-2022-204 [1].

Exploitation

To exploit this vulnerability, an attacker must have local access and high privileges (e.g., Administrator or SYSTEM-level access). The attacker would manipulate SMM communication buffers via a crafted SMI (System Management Interrupt) to trigger a buffer verification flaw. The attack complexity is high, requiring precise timing and knowledge of the system's SMM interface [1].

Impact

Successful exploitation could lead to arbitrary code execution within SMM (ring -2), which allows the attacker to execute code with the highest privilege level, bypassing OS-level security controls. Alternatively, the vulnerability could be used to cause a denial of service by crashing the system. The CVSS v3.1 base score is 7.5, with a vector string of AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H, indicating high confidentiality, integrity, and availability impacts [1].

Mitigation

Dell has released BIOS updates to address this vulnerability as part of DSA-2022-204. Customers should update their PowerEdge and Precision system BIOS to the latest versions provided by Dell. No workarounds are available, and the fix is included in updates published on or after the advisory date (August 2022) [1].