CVE-2023-4807

/// Technical description

Issue summary: The POLY1305 MAC (message authentication code) implementation

contains a bug that might corrupt the internal state of applications on the

Windows 64 platform when running on newer X86_64 processors supporting the

AVX512-IFMA instructions.

Impact summary: If in an application that uses the OpenSSL library an attacker

can influence whether the POLY1305 MAC algorithm is used, the application

state might be corrupted with various application dependent consequences.

The POLY1305 MAC (message authentication code) implementation in OpenSSL does

not save the contents of non-volatile XMM registers on Windows 64 platform

when calculating the MAC of data larger than 64 bytes. Before returning to

the caller all the XMM registers are set to zero rather than restoring their

previous content. The vulnerable code is used only on newer x86_64 processors

supporting the AVX512-IFMA instructions.

The consequences of this kind of internal application state corruption can

be various - from

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References