CVE-2023-4421

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.
References
Configurations

Configuration 1 (hide)

cpe:2.3:a:mozilla:nss:*:*:*:*:*:*:*:*

History

20 Dec 2023, 18:40

Type Values Removed Values Added
CWE CWE-203
CVSS v2 : unknown
v3 : unknown
v2 : unknown
v3 : 6.5
CPE cpe:2.3:a:mozilla:nss:*:*:*:*:*:*:*:*
References () https://bugzilla.mozilla.org/show_bug.cgi?id=1651411 - () https://bugzilla.mozilla.org/show_bug.cgi?id=1651411 - Issue Tracking
References () https://www.mozilla.org/security/advisories/mfsa2023-53/ - () https://www.mozilla.org/security/advisories/mfsa2023-53/ - Issue Tracking, Vendor Advisory
First Time Mozilla nss
Mozilla

12 Dec 2023, 17:22

Type Values Removed Values Added
New CVE

Information

Published : 2023-12-12 17:15

Updated : 2024-02-28 20:54


NVD link : CVE-2023-4421

Mitre link : CVE-2023-4421

CVE.ORG link : CVE-2023-4421


JSON object : View

Products Affected

mozilla

  • nss
CWE
CWE-203

Observable Discrepancy