CVE-2023-4807 is a vulnerability affecting the OpenSSL library, specifically within the POLY1305 MAC (message authentication code) implementation. This vulnerability allows for potential corruption of the internal state of applications running on Windows 64 platforms that utilize newer X86_64 processors supporting AVX512-IFMA instructions. The severity of this issue is classified as high due to the impact it could have on applications using OpenSSL, particularly in scenarios where an attacker could influence the use of the POLY1305 MAC algorithm.
The CVSS score for this vulnerability is 7.8, indicating its high severity. The implications involve the possibility of application state corruption, which might yield various consequences depending on the application's reliance on the contents of the non-volatile XMM registers. If an attacker successfully exploits this vulnerability, it could lead to incorrect results from calculations or even a denial of service if the application crashes.
Organizations utilizing OpenSSL should be aware that the POLY1305 MAC algorithm is a critical component often employed in conjunction with TLS protocols 1.2 and 1.3. While there are currently no specific applications confirmed to be affected by this vulnerability, the potential risks necessitate immediate attention and remediation. Organizations should prioritize patching this vulnerability to mitigate any risks associated with exploitation.
As a workaround, the support for AVX512-IFMA instructions can be disabled at runtime by setting the environment variable OPENSSL_ia32cap to prevent the exploitation of this vulnerability: OPENSSL_ia32cap=:~0x200000.
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