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CVE-2020-12400

Public on 2020-10-08
Modified on 2021-07-12
Description

A side-channel flaw was found in NSS, in the way P-384 and P-521 curves are used in the generation of EDSA signatures, 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
See what this means
CVSS v3 Base Score
4.4
See breakdown

Affected Packages

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

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 1.2 AV:L/AC:H/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