CVE-2024-21859

Vulnerability

CVE-2024-21859 is an improper buffer restrictions vulnerability in the UEFI firmware shipped with certain Intel processors. The flaw stems from insufficient bounds checking on data handled during firmware execution, which can lead to memory contents being exposed outside intended boundaries [1].

Exploitation

Exploitation requires local, authenticated access to the system and a heightened privilege level (e.g., ring 0 or system management mode). The attacker must be able to execute code at sufficient privilege to trigger the vulnerable firmware path, after which improper buffer handling can result in unintended memory disclosure [1].

Impact

A successful exploit allows the attacker to read arbitrary memory regions, potentially exposing secrets such as cryptographic keys, credentials, or proprietary code from the firmware or Trusted Execution Environment (TEE). While information disclosure does not directly grant code execution, it can significantly weaken the platform's security posture and enable further attacks [1].

Mitigation

Intel released firmware updates through its OEM partners to address the improper buffer restriction. Users should apply the latest UEFI updates from their platform vendor. No workarounds are available; updating the firmware is the recommended course of action [1].