CVE-2021-4126

Publication date 24 December 2021

Last updated 24 July 2024


Ubuntu priority

Cvss 3 Severity Score

6.5 · Medium

Score breakdown

When receiving an OpenPGP/MIME signed email message that contains an additional outer MIME message layer, for example a message footer added by a mailing list gateway, Thunderbird only considered the inner signed message for the signature validity. This gave the false impression that the additional contents were also covered by the digital signature. Starting with Thunderbird version 91.4.1, only the signature that belongs to the top level MIME part will be considered for the displayed status. This vulnerability affects Thunderbird < 91.4.1.

Status

Package Ubuntu Release Status
thunderbird 23.04 lunar
Fixed 1:91.5.0+build1-0ubuntu1
22.10 kinetic
Fixed 1:91.5.0+build1-0ubuntu1
22.04 LTS jammy
Fixed 1:91.5.0+build1-0ubuntu1
21.10 impish
Fixed 1:91.5.0+build1-0ubuntu0.21.10.1
21.04 hirsute Ignored end of life
20.04 LTS focal
Fixed 1:91.5.0+build1-0ubuntu0.20.04.1
18.04 LTS bionic
Fixed 1:91.5.0+build1-0ubuntu0.18.04.1
16.04 LTS xenial Ignored end of standard support
14.04 LTS trusty Ignored end of standard support

Severity score breakdown

Parameter Value
Base score 6.5 · Medium
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-5246-1
    • Thunderbird vulnerabilities
    • 21 January 2022
    • USN-5248-1
    • Thunderbird vulnerabilities
    • 21 January 2022

Other references