ID |
CVE-2023-4421
|
Sažetak |
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. |
Reference |
|
CVSS |
Base: | 6.5 |
Impact: | 3.6 |
Exploitability: | 2.8 |
|
Pristup |
Vektor | Složenost | Autentikacija |
NETWORK |
LOW |
LOW |
|
Impact |
Povjerljivost | Cjelovitost | Dostupnost |
HIGH |
NONE |
NONE |
|
CVSS vektor |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Zadnje važnije ažuriranje |
20-12-2023 - 18:40 |
Objavljeno |
12-12-2023 - 17:15 |