Advisory Published

USN-6563-1: Thunderbird vulnerabilities

First published: Tue Jan 02 2024(Updated: )

Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, bypass security restrictions, cross-site tracing, or execute arbitrary code.(CVE-2023-6857, CVE-2023-6858, CVE-2023-6859, CVE-2023-6861, CVE-2023-6862, CVE-2023-6863, CVE-2023-6864) Marcus Brinkmann discovered that Thunderbird did not properly parse a PGP/MIME payload that contains digitally signed text. An attacker could potentially exploit this issue to spoof an email message. (CVE-2023-50762) Marcus Brinkmann discovered that Thunderbird did not properly compare the signature creation date with the message date and time when using digitally signed S/MIME email message. An attacker could potentially exploit this issue to spoof date and time of an email message. (CVE-2023-50761) DoHyun Lee discovered that Thunderbird did not properly manage memory when used on systems with the Mesa VM driver. An attacker could potentially exploit this issue to execute arbitrary code. (CVE-2023-6856) Andrew Osmond discovered that Thunderbird did not properly validate the textures produced by remote decoders. An attacker could potentially exploit this issue to escape the sandbox. (CVE-2023-6860)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/thunderbird<1:115.6.0+build2-0ubuntu0.23.10.1
1:115.6.0+build2-0ubuntu0.23.10.1
Ubuntu=23.10
All of
ubuntu/thunderbird<1:115.6.0+build2-0ubuntu0.23.04.1
1:115.6.0+build2-0ubuntu0.23.04.1
Ubuntu=23.04
All of
ubuntu/thunderbird<1:115.6.0+build2-0ubuntu0.22.04.1
1:115.6.0+build2-0ubuntu0.22.04.1
Ubuntu=22.04
All of
ubuntu/thunderbird<1:115.6.0+build2-0ubuntu0.20.04.1
1:115.6.0+build2-0ubuntu0.20.04.1
Ubuntu=20.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-6563-1?

    USN-6563-1 addresses multiple security issues in Thunderbird, which could potentially lead to denial of service or sensitive data exposure.

  • How do I fix USN-6563-1?

    To mitigate the vulnerabilities outlined in USN-6563-1, upgrade Thunderbird to versions 1:115.6.0+build2-0ubuntu0.23.10.1 or later, depending on your Ubuntu version.

  • Which versions of Ubuntu are affected by USN-6563-1?

    USN-6563-1 affects Ubuntu versions 20.04, 22.04, 23.04, and 23.10 that are running outdated versions of Thunderbird.

  • Can USN-6563-1 impact my personal information?

    Yes, if exploited, the vulnerabilities in USN-6563-1 could allow attackers to obtain sensitive information from the affected Thunderbird installations.

  • Is it safe to continue using Thunderbird without applying the USN-6563-1 update?

    No, continuing to use an outdated version of Thunderbird without applying the update from USN-6563-1 poses significant security risks.

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