CVE-2020-12401

Public on 2020-11-09
Modified on 2021-07-12
Description
A flaw was found in nss. Using the EM side-channel, it is possible to extract the position of zero and non-zero wNAF digits while nss-certutil tool performs scalar multiplication during the ECDSA signature generation, leaking partial information about the ECDSA nonce. Given a small number of ECDSA signatures, this information can be used to steal the private key. The highest threat from this vulnerability is to data confidentiality.
Severity
Medium
CVSS v3 Base Score
4.4
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 nspr 2020-11-09 21:02 ALAS2-2020-1559
Amazon Linux 2 nss-util 2020-11-09 21:02 ALAS2-2020-1559
Amazon Linux 2 nss-softokn 2020-11-09 21:02 ALAS2-2020-1559
Amazon Linux 2 nss 2020-11-09 21:02 ALAS2-2020-1559
Amazon Linux 1 nspr 2021-07-08 18:41 ALAS-2021-1522
Amazon Linux 1 nss-util 2021-07-08 18:41 ALAS-2021-1522
Amazon Linux 1 nss-softokn 2021-07-08 18:41 ALAS-2021-1522

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.4 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
NVD CVSSv2 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N
NVD CVSSv3 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N