Advisory Published

USN-4421-1: Thunderbird vulnerabilities

First published: Wed Jul 08 2020(Updated: )

Multiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, or execute arbtirary code. (CVE-2020-12405, CVE-2020-12406, CVE-2020-12410, CVE-2020-12417, CVE-2020-12418, CVE-2020-12419, CVE-2020-12420) It was discovered that Thunderbird would continue an unencrypted connection when configured to use STARTTLS for IMAP if the server responded with PREAUTH. A remote attacker could potentially exploit this to perform a person-in-the-middle attack in order to obtain sensitive information. (CVE-2020-12398) It was discovered that NSS showed timing differences when performing DSA signatures. An attacker could potentially exploit this to obtain private keys using a timing attack. (CVE-2020-12399) It was discovered that when performing add-on updates, certificate chains not terminating with built-in roots were silently rejected. This could result in add-ons becoming outdated. (CVE-2020-12421)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/thunderbird<1:68.10.0+build1-0ubuntu0.20.04.1
1:68.10.0+build1-0ubuntu0.20.04.1
=20.04
All of
ubuntu/thunderbird<1:68.10.0+build1-0ubuntu0.19.10.1
1:68.10.0+build1-0ubuntu0.19.10.1
=19.10
All of
ubuntu/thunderbird<1:68.10.0+build1-0ubuntu0.18.04.1
1:68.10.0+build1-0ubuntu0.18.04.1
=18.04
All of
ubuntu/thunderbird<1:68.10.0+build1-0ubuntu0.16.04.1
1:68.10.0+build1-0ubuntu0.16.04.1
=16.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-4421-1?

    The severity of USN-4421-1 is high.

  • How do I fix USN-4421-1?

    To fix USN-4421-1, update Thunderbird to version 1:68.10.0+build1-0ubuntu0.20.04.1 for Ubuntu 20.04, 1:68.10.0+build1-0ubuntu0.19.10.1 for Ubuntu 19.10, 1:68.10.0+build1-0ubuntu0.18.04.1 for Ubuntu 18.04, or 1:68.10.0+build1-0ubuntu0.16.04.1 for Ubuntu 16.04.

  • What are the potential impacts of USN-4421-1?

    The potential impacts of USN-4421-1 include denial of service, sensitive information disclosure, and arbitrary code execution.

  • Where can I find more information about USN-4421-1?

    You can find more information about USN-4421-1 at the following references: [1] [2] [3].

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