CVE-2021-4126
Publication date 24 December 2021
Last updated 24 July 2024
Ubuntu priority
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 | ||
| 22.04 LTS jammy |
Fixed 1:91.5.0+build1-0ubuntu1
|
|
| 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 | |
| 14.04 LTS trusty | Ignored |
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