CVE-2023-45287

Summary

CVE-2023-45287: Before Go 1.20, the RSA-based TLS key exchanges in Go used the math/big library, which was not constant time. Although RSA blinding was employed to prevent timing attacks, recent analysis suggests that this measure may not have been entirely effective. Specifically, the removal of PKCS#1 padding in Go's implementation may cause timing leaks, potentially revealing session key bits. In response, Go 1.20 now utilizes a fully constant time RSA implementation in its crypto/tls library, mitigating these concerns.

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