CVE-2020-12401

Published: 5 August 2020

During ECDSA signature generation, padding applied in the nonce designed to ensure constant-time scalar multiplication was removed, resulting in variable-time execution dependent on secret data. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

Priority

Cvss 3 Severity Score

4.7

Score breakdown

Status

Package	Release	Status
nss Launchpad, Ubuntu, Debian	upstream	Released (2:3.55-1)
	trusty	Released (2:3.28.4-0ubuntu0.14.04.5+esm7) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	bionic	Released (2:3.35-2ubuntu2.11)
	focal	Released (2:3.49.1-1ubuntu1.4)
	xenial	Released (2:3.28.4-0ubuntu0.16.04.13)
	Patches: upstream: https://hg.mozilla.org/projects/nss/rev/aeb2e583ee957a699d949009c7ba37af76515c20
firefox Launchpad, Ubuntu, Debian	trusty	Does not exist
	bionic	Released (80.0+build2-0ubuntu0.18.04.1)
	focal	Released (80.0+build2-0ubuntu0.20.04.1)
	upstream	Released (80)
	xenial	Released (80.0+build2-0ubuntu0.16.04.1)

Severity score breakdown

Parameter	Value
Base score	4.7
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Bugs

https://bugzilla.mozilla.org/show_bug.cgi?id=1631573 (private)

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