Overview
This report details an identified vulnerability, CVE-2024-36354, in the improper input validation for Dual Inline Memory Module (DIMM) Serial Presence Detect (SPD) metadata. This flaw potentially impacts any system with a non-compliant DIMM, and it presents a significant threat due to the possibility of bypassing System Management Mode (SMM) isolation. The vulnerability could lead to arbitrary code execution at the SMM level and is therefore of high concern.
Vulnerability Summary
CVE ID: CVE-2024-36354
Severity: High (CVSS: 7.5)
Attack Vector: Physical, Local, or Root of Trust for BIOS update
Privileges Required: Ring0, Physical access, or Control over Root of Trust for BIOS update
User Interaction: None
Impact: Bypassing SMM isolation potentially leading to arbitrary code execution at the SMM level. This could result in system compromise or data leakage.
Affected Products
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Product | Affected Versions
DIMM SPD | All versions prior to latest patch
BIOS | All versions not including the latest security update
How the Exploit Works
An attacker exploiting CVE-2024-36354 would manipulate the input validation for DIMM SPD metadata. This can be achieved through physical access to the system, ring0 access, or control over the Root of Trust for BIOS update. Successful manipulation could allow the attacker to bypass SMM isolation, granting them the ability to execute code at the SMM level, which could potentially compromise the entire system or lead to data leakage.
Conceptual Example Code
# Attacker gains ring0 access
sudo su
# Attacker manipulates DIMM SPD metadata
echo 'malicious_code' > /sys/devices/system/edac/mc/mc0/dimm1/spd
# Attacker exploits vulnerability to bypass SMM isolation and execute code
./exploitThis is a simple conceptual example and in real-world scenarios, the exploit would likely be more complex and may involve additional steps or stages.