A NSS security update has been released for Ubuntu Linux 20.04 LTS, 19.10, 18.04 LTS, and 16.04 LTS.

USN-4417-1: NSS vulnerability

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Ubuntu Security Notice USN-4417-1
July 06, 2020

nss vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

NSS could be made to expose sensitive information.

Software Description:
- nss: Network Security Service library

Details:

Cesar Pereida, Billy Bob Brumley, Yuval Yarom, and Nicola Tuveri discovered
that NSS incorrectly handled RSA key generation. A local attacker could
possibly use this issue to perform a timing attack and recover RSA keys.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
libnss3 2:3.49.1-1ubuntu1.2

Ubuntu 19.10:
libnss3 2:3.45-1ubuntu2.4

Ubuntu 18.04 LTS:
libnss3 2:3.35-2ubuntu2.9

Ubuntu 16.04 LTS:
libnss3 2:3.28.4-0ubuntu0.16.04.12

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://usn.ubuntu.com/4417-1
CVE-2020-12402

Package Information:
  https://launchpad.net/ubuntu/+source/nss/2:3.49.1-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/nss/2:3.45-1ubuntu2.4
  https://launchpad.net/ubuntu/+source/nss/2:3.35-2ubuntu2.9
  https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.16.04.12