CVE-2018-12182 in EDK II
Summary
by MITRE
Insufficient memory write check in SMM service for EDK II may allow an authenticated user to potentially enable escalation of privilege, information disclosure and/or denial of service via local access.
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Analysis
by VulDB Data Team • 08/08/2023
The vulnerability identified as CVE-2018-12182 represents a critical security flaw within the System Management Mode SMM service implementation in EDK II firmware development environment. This issue stems from inadequate memory write validation mechanisms that govern how SMM services handle memory operations during firmware execution. The flaw exists specifically within the SMM communication protocols and memory management routines that are designed to operate in a highly privileged execution context where firmware components interact with system hardware and memory structures. The vulnerability affects implementations of EDK II that incorporate SMM services, making it particularly concerning for systems where firmware security is paramount such as enterprise servers, embedded systems, and IoT devices that rely on UEFI firmware implementations.
The technical root cause of CVE-2018-12182 lies in insufficient input validation during memory write operations within the SMM handler routines. When authenticated users gain local access to a system, they can potentially exploit this weakness to manipulate memory locations that should normally be protected from unauthorized modification. The flaw allows for improper bounds checking and validation of memory addresses during SMM service execution, enabling attackers to write to memory regions that should remain inaccessible. This vulnerability operates at the intersection of firmware security and privilege escalation, where the SMM service fails to properly validate memory write operations before executing them. The issue manifests as a failure to implement proper memory protection mechanisms that would normally prevent unauthorized memory modifications, creating a pathway for malicious actors to manipulate system firmware behavior. This weakness is particularly dangerous because SMM operates with the highest privilege level in the system, making any compromise of SMM services potentially catastrophic for overall system security.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass information disclosure and denial of service capabilities. An authenticated local attacker can leverage this flaw to gain elevated privileges within the firmware environment, potentially enabling them to access sensitive system information, modify critical firmware components, or cause system instability through memory corruption. The information disclosure aspect allows attackers to extract confidential data from protected memory regions, while the denial of service component can render systems unresponsive or cause permanent damage to firmware integrity. The vulnerability's exploitation requires local access and authentication, which reduces the attack surface compared to remote exploits, but it remains particularly concerning for environments where physical access control is insufficient or where insider threats exist. Systems that rely heavily on UEFI firmware security features and SMM-based services are most vulnerable, including enterprise servers, embedded systems, and devices with complex firmware implementations that depend on EDK II for their firmware development.
Mitigation strategies for CVE-2018-12182 should focus on firmware updates from vendors who have addressed this specific vulnerability within their EDK II implementations. Organizations must ensure that their firmware versions have been patched to include proper memory write validation checks within SMM service handlers. The implementation of firmware integrity monitoring systems can help detect unauthorized modifications to critical firmware components. Access control measures should be strengthened to limit local authentication access, particularly for systems where firmware security is critical. System administrators should implement regular firmware audits and vulnerability assessments to identify systems running vulnerable EDK II implementations. The vulnerability aligns with CWE-129 which addresses insufficient input validation, and it maps to ATT&CK technique T1068 which covers privilege escalation through local system exploitation. Organizations should also consider implementing hardware-based security features such as Intel's Platform Trust Technology or similar TPM implementations to add additional layers of protection against firmware-level attacks. Regular security updates and firmware management practices should be enforced across all systems that utilize EDK II-based firmware implementations to prevent exploitation of this and similar vulnerabilities.