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Improper input validation in the SMM handler could allow an attacker with Ring0 access to write to SMRAM and modify execution flow for S3 (sleep) wake up, potentially resulting in arbitrary code execution.

CVE-2024-36355 is an out-of-bounds write vulnerability classified under CWE-787, affecting the System Management Mode (SMM) handler in AMD EPYC™ 9004 Series processors. The flaw stems from improper input validation within the SMM handler, which operates at a highly privileged level (Ring0). An attacker who already has Ring0 access can exploit this vulnerability to write arbitrary data into the System Management RAM (SMRAM), a protected memory region used by the processor for critical system management tasks. By modifying SMRAM contents, the attacker can alter the execution flow during the system's S3 (sleep) state wake-up process, enabling arbitrary code execution with elevated privileges. This can lead to persistent compromise below the operating system level, bypassing many security controls. The vulnerability requires high privileges (Ring0), high attack complexity, and physical or administrative access, with no user interaction needed. The CVSS v4.0 base score is 7.0, reflecting a high severity due to the potential impact on system integrity and confidentiality. No public exploits or patches have been reported yet. The vulnerability affects the latest AMD EPYC 9004 Series processors, widely used in enterprise servers and cloud data centers, making it a significant concern for organizations relying on these platforms.

Detailed information about CVE-2024-36355: CWE-787  Out-of-bounds Write in AMD AMD EPYC™ 9004 Series Processors affecting AMD AMD EPYC™ 9004 Series Processors. 

CVE-2024-36355: CWE-787  Out-of-bounds Write in AMD AMD EPYC™ 9004 Series Processors - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2024-36355: CWE-787  Out-of-bounds Write in AMD AMD EPYC™ 9004 Series Processors

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