Advisory Published

USN-4397-1: NSS vulnerabilities

First published: Tue Jun 16 2020(Updated: )

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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libnss3<2:3.49.1-1ubuntu1.1
2:3.49.1-1ubuntu1.1
=20.04
All of
ubuntu/libnss3<2:3.45-1ubuntu2.3
2:3.45-1ubuntu2.3
=19.10
All of
ubuntu/libnss3<2:3.35-2ubuntu2.8
2:3.35-2ubuntu2.8
=18.04
All of
ubuntu/libnss3<2:3.28.4-0ubuntu0.16.04.11
2:3.28.4-0ubuntu0.16.04.11
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID of this advisory?

    The vulnerability ID of this advisory is USN-4397-1.

  • What software is affected by the vulnerability?

    The libnss3 package in Ubuntu 16.04, 18.04, 19.10, and 20.04 LTS is affected by this vulnerability.

  • What is the severity of the vulnerability?

    The severity of the vulnerability is not mentioned in the provided information.

  • How can the vulnerability be fixed?

    To fix the vulnerability, update the libnss3 package to version 2:3.49.1-1ubuntu1.1 for Ubuntu 18.04 LTS and Ubuntu 19.10, or version 2:3.45-1ubuntu2.3 for Ubuntu 20.04 LTS.

  • Where can I find more information about this vulnerability?

    More information about this vulnerability can be found on the Ubuntu Security Notices page: [USN-4397-1](https://ubuntu.com/security/notices/USN-4397-1)

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