CVE-2020-0551 in Intel
Summary
by MITRE
Load value injection in some Intel(R) Processors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access. The list of affected products is provided in intel-sa-00334: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00334.html
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Analysis
by VulDB Data Team • 08/25/2025
This vulnerability represents a sophisticated side-channel attack vector that exploits speculative execution mechanisms in Intel processors, specifically targeting the load value injection flaw that enables unauthorized information disclosure. The vulnerability resides in the processor's speculative execution engine where data values are loaded and processed before the actual execution path is determined, creating opportunities for malicious actors to extract sensitive information through carefully crafted sequences of operations. The flaw affects a broad range of Intel processor architectures including those utilizing the Intel Software Guard Extensions and other speculative execution features, making it particularly concerning for enterprise environments where such processors are widely deployed. The vulnerability is classified under CWE-200 as exposure of sensitive information and aligns with ATT&CK technique T1059.001 for command and scripting interpreter usage in exploitation contexts.
The technical implementation of this vulnerability leverages the processor's ability to speculatively load data values into internal buffers and caches before the actual execution path is confirmed. An authenticated attacker with local access can manipulate the processor's behavior by injecting specific load values that cause the processor to cache sensitive information in locations that can be subsequently accessed through side-channel timing attacks. This mechanism operates at the microarchitectural level where speculative execution creates temporary states that may persist in the cache hierarchy even after the speculative execution completes, allowing for information leakage. The vulnerability is particularly dangerous because it operates below the operating system level and can bypass traditional security controls, making it difficult to detect through conventional monitoring approaches.
The operational impact of CVE-2020-0551 extends beyond simple information disclosure to potentially enable more sophisticated attacks including privilege escalation and data exfiltration from secure environments. Attackers can exploit this vulnerability to extract cryptographic keys, passwords, and other sensitive data from memory locations that should remain protected. The vulnerability affects systems where Intel processors are used for security-sensitive operations including database servers, web applications, and enterprise infrastructure where sensitive data processing occurs. The exploit requires local authentication but can be particularly devastating in environments where privileged accounts are compromised, as the attacker can leverage the vulnerability to access additional system resources and escalate privileges. Organizations running affected Intel processors face potential data breaches and compliance violations that could result in significant financial and reputational damage.
Mitigation strategies for this vulnerability include implementing microcode updates from Intel that modify the processor's speculative execution behavior to prevent the load value injection patterns that enable the attack. System administrators should prioritize patching affected systems and implementing additional security controls such as memory protection techniques and runtime monitoring to detect anomalous behavior patterns. The mitigation approach aligns with industry best practices for addressing speculative execution vulnerabilities and requires careful testing to ensure compatibility with existing applications and system functionality. Organizations should also consider implementing additional security layers including secure boot mechanisms, memory encryption, and network segmentation to reduce the attack surface and limit the potential impact of successful exploitation attempts. The vulnerability highlights the importance of maintaining current security patches and implementing comprehensive security monitoring strategies that can detect and respond to sophisticated side-channel attacks.