Information Disclosure Vulnerability in Intel UEFI Reference BIOS

The German Federal Office for Information Security (BSI) has released an advisory regarding an information disclosure vulnerability found within the Intel UEFI Reference BIOS. This security flaw allows a local attacker, who must have sufficient privileges to interact with the firmware or system-level interfaces, to extract sensitive information that should otherwise be protected by firmware-level security boundaries.

The vulnerability is rooted in the implementation of the reference BIOS code provided by Intel. Because this reference code is integrated into various OEM firmware implementations, the impact is potentially widespread across a broad range of hardware platforms regardless of the installed operating system (Windows, Linux, or macOS). Defenders should prioritize tracking OEM-specific firmware updates to mitigate the risk of local unauthorized access to protected system memory or configuration data.

Impact

Successful exploitation of this vulnerability enables a local attacker to bypass existing security boundaries, leading to the exposure of sensitive information residing in protected memory segments. In enterprise or multi-user environments, this could facilitate the theft of cryptographic material, kernel-level secrets, or other protected configuration data, significantly lowering the barrier for more advanced persistent threats.

Recommendation

• Monitor official communication channels from motherboard and system OEMs (e.g., Dell, HP, Lenovo) for firmware updates addressing the Intel UEFI Reference BIOS vulnerability.
• Audit systems for unauthorized use of low-level hardware or firmware interaction tools that may be used to interface with the UEFI interface locally.
• Ensure strict physical and logical access controls are enforced on endpoints to minimize the risk of a local attacker accessing high-privilege execution contexts required to trigger this firmware-level flaw.