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CVE-2020-12402

Publication date 19 June 2020

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.4 · Medium

Score breakdown

During RSA key generation, bignum implementations used a variation of the Binary Extended Euclidean Algorithm which entailed significantly input-dependent flow. This allowed an attacker able to perform electromagnetic-based side channel attacks to record traces leading to the recovery of the secret primes. *Note:* An unmodified Firefox browser does not generate RSA keys in normal operation and is not affected, but products built on top of it might. This vulnerability affects Firefox < 78.

Status

Package Ubuntu Release Status
nss 20.04 LTS focal
Fixed 2:3.49.1-1ubuntu1.2
19.10 eoan
Fixed 2:3.45-1ubuntu2.4
18.04 LTS bionic
Fixed 2:3.35-2ubuntu2.9
16.04 LTS xenial
Fixed 2:3.28.4-0ubuntu0.16.04.12
14.04 LTS trusty

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
nss

Severity score breakdown

Parameter Value
Base score 4.4 · Medium
Attack vector Local
Attack complexity High
Privileges required Low
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

Other references