CVE-2021-38502 Information

Description

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured the MITM could obtain the authentication credentials too. This vulnerability affects Thunderbird < 91.2.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1733366 https://www.mozilla.org/security/advisories/mfsa2021-47/ https://www.debian.org/security/2022/dsa-5034 https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9