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
Link | Resource |
---|---|
https://bugzilla.mozilla.org/show_bug.cgi?id=1651411 | Issue Tracking |
https://www.mozilla.org/security/advisories/mfsa2023-53/ | Issue Tracking Vendor Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: mozilla
Published: 2023-12-12T17:02:08.801Z
Updated: 2023-12-12T17:02:08.801Z
Reserved: 2023-08-18T13:25:38.056Z
Link: CVE-2023-4421
JSON object: View
NVD Information
Status : Analyzed
Published: 2023-12-12T17:15:08.347
Modified: 2023-12-20T18:40:25.117
Link: CVE-2023-4421
JSON object: View
Redhat Information
No data.
CWE