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Add an advisory for an issue fixed in NSS 3.61
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## mfsa2023-53.yml | ||
announced: December 12, 2023 | ||
impact: moderate | ||
fixed_in: | ||
- NSS 3.61 | ||
title: Timing side-channel in PKCS#1 v1.5 decryption depadding code | ||
description: <i>Although this issue was embargoed until 2023, it was fixed in NSS 3.61 as released on January 22, 2021</i> | ||
advisories: | ||
CVE-2023-4421: | ||
title: Timing side-channel in PKCS#1 v1.5 decryption depadding code | ||
impact: moderate | ||
reporter: Hubert Kario | ||
description: | | ||
The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. | ||
Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. | ||
By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim's key. | ||
The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. | ||
bugs: | ||
- url: 1651411 |