CVE-2023-4421

Katalog CVE

CVSS 6.5 · Medium EPSS 0,76%

Kerentanan Observable Discrepancy pada mozilla nss. Skor CVSS 3.1 6.5 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

12 Desember 2023

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

6.5 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-203: Observable Discrepancy

EPSS (30 hari)

0,76% peluang dieksploitasi; lebih tinggi dari 54,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://www.mozilla.org/security/advisories/mfsa2023-53/ issue tracking · advisory vendor
• https://bugzilla.mozilla.org/show_bug.cgi?id=1651411 issue tracking
• https://lists.debian.org/debian-lts-announce/2023/10/msg00039.html