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CVE-2020-12401

Public on 2020-10-08
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
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CVSS v3 Base Score
4.4
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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 1.9 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