VULNERABILITY

Debian: CVE-2023-4421: nss -- security update

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Debian: CVE-2023-4421: nss -- security update

Severity
7
CVSS
(AV:N/AC:L/Au:S/C:C/I:N/A:N)
Published
10/30/2023
Created
10/31/2023
Added
10/30/2023
Modified
01/30/2025

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. This vulnerability affects NSS < 3.61.

Solution(s)

  • debian-upgrade-nss

References

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