CVE-2023-31323 Overview
A type confusion vulnerability exists in the AMD Secure Processor (ASP) that could allow an attacker to pass a malformed argument to the External Global Memory Interconnect Trusted Agent (XGMI TA). This memory safety violation could potentially result in loss of confidentiality, integrity, or availability of the affected system.
Critical Impact
This vulnerability affects the AMD Secure Processor's trusted execution environment, potentially compromising the security foundation of AMD-based systems through memory safety violations in the XGMI TA component.
Affected Products
- AMD processors with Secure Processor (ASP) supporting XGMI TA
- Systems utilizing External Global Memory Interconnect functionality
- AMD platforms with vulnerable ASP firmware versions
Discovery Timeline
- 2026-02-12 - CVE CVE-2023-31323 published to NVD
- 2026-02-12 - Last updated in NVD database
Technical Details for CVE-2023-31323
Vulnerability Analysis
This vulnerability is classified as CWE-843 (Access of Resource Using Incompatible Type - Type Confusion). Type confusion occurs when a program accesses a resource using an incompatible type, leading to undefined behavior and potential memory corruption.
In this case, the AMD Secure Processor's XGMI Trusted Agent improperly handles type information when processing arguments. The XGMI TA is a critical security component responsible for managing secure communication across AMD's External Global Memory Interconnect, which facilitates high-speed data transfer between processors in multi-socket configurations.
When a malformed argument with incorrect type information is passed to the XGMI TA, the processor may interpret memory in an unintended way, leading to memory safety violations. This can corrupt data structures, expose sensitive information, or cause system instability.
Root Cause
The root cause is improper type validation within the XGMI Trusted Agent component of the AMD Secure Processor. The ASP fails to adequately verify that incoming arguments conform to expected type specifications before processing them. This lack of rigorous type checking allows malformed data to be interpreted as a different type than intended, causing the processor to operate on memory with incorrect assumptions about its structure and content.
Attack Vector
The attack vector requires local access to the system. An attacker with local privileges could craft specially malformed arguments to the XGMI TA interface. Since this vulnerability resides in the Secure Processor's trusted execution environment, successful exploitation could potentially bypass security boundaries that normally protect sensitive operations.
The attack does not require user interaction and can be executed without special privileges at the hardware interface level. The exploitation mechanism involves crafting input that triggers type confusion when processed by the XGMI TA, leading to memory corruption or information disclosure within the trusted execution environment.
Detection Methods for CVE-2023-31323
Indicators of Compromise
- Unexpected system crashes or instability related to multi-processor communication
- Anomalous behavior in AMD Secure Processor operations or XGMI functionality
- Unusual memory access patterns detected in firmware-level monitoring
- Error logs indicating malformed data in secure processor communications
Detection Strategies
- Monitor for unexpected AMD Secure Processor errors or exceptions in system logs
- Implement firmware integrity verification to detect unauthorized modifications
- Deploy endpoint detection solutions capable of monitoring low-level hardware interactions
- Establish baseline behavior for XGMI communications and alert on deviations
Monitoring Recommendations
- Enable comprehensive system logging for AMD PSP (Platform Security Processor) events
- Regularly audit firmware versions against AMD security bulletins
- Implement hardware security monitoring solutions with ASP visibility
- Configure alerts for anomalous secure processor behavior patterns
How to Mitigate CVE-2023-31323
Immediate Actions Required
- Review the AMD Security Bulletin AMD-SB-6024 for affected products
- Inventory all AMD-based systems to identify those with vulnerable ASP firmware
- Apply firmware updates provided by AMD or system vendors as soon as available
- Prioritize patching for systems in multi-socket configurations using XGMI
Patch Information
AMD has released security information regarding this vulnerability in their Security Bulletin AMD-SB-6024. Organizations should consult this bulletin for specific firmware versions and update procedures. Firmware updates are typically delivered through system BIOS/UEFI updates from the system manufacturer (OEM).
Contact your hardware vendor or OEM for the appropriate BIOS/UEFI update that includes the patched AMD Secure Processor firmware. Ensure proper backup procedures are in place before applying firmware updates.
Workarounds
- Restrict local access to affected systems to trusted administrators only
- Implement defense-in-depth strategies to limit the impact of potential exploitation
- Monitor affected systems closely until firmware updates can be applied
- Consider network segmentation for critical systems using XGMI interconnects
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
