CVE-2023-4421

CVSS 3.1 Score 6.5 of 10 (medium)

Details

Published Dec 12, 2023
Updated: Dec 20, 2023
CWE ID 203

Summary

CVE-2023-4421 is a vulnerability affecting the NSS code used for checking PKCS#1 v1.5. The flaw allows an attacker to leak information through timing side-channel, potentially decrypting intercepted PKCS#1 v1.5 ciphertext or forging signatures using the victim's key. The issue stems from the NSS code's inability to correctly handle invalid padding, resulting in the leakage of both the overall padding correctness and message length. The vulnerability has been addressed by implementing the implicit rejection algorithm, where NSS returns a deterministic random message upon detecting invalid padding, as per the Marvin Attack paper. NSS versions prior to 3.61 are susceptible to this issue.

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