USN-4397-1: NSS vulnerabilities

nss vulnerabilities

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

Several security issues were fixed in NSS.

Software Description

nss – Network Security Service library

Details

It was discovered that NSS incorrectly handled the TLS State Machine. A
remote attacker could possibly use this issue to cause NSS to hang,
resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS
and Ubuntu 19.10. (CVE-2019-17023)

Cesar Pereida Garcia discovered that NSS incorrectly handled DSA key
generation. A local attacker could possibly use this issue to perform a
timing attack and recover DSA keys. (CVE-2020-12399)

Update instructions

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

Ubuntu 20.04 LTS: libnss3 – 2:3.49.1-1ubuntu1.1
Ubuntu 19.10: libnss3 – 2:3.45-1ubuntu2.3
Ubuntu 18.04 LTS: libnss3 – 2:3.35-2ubuntu2.8
Ubuntu 16.04 LTS: libnss3 – 2:3.28.4-0ubuntu0.16.04.11

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

Source: USN-4397-1: NSS vulnerabilities

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