CVE-2020-12398

Description

If Thunderbird is configured to use STARTTLS for an IMAP server, and the server sends a PREAUTH response, then Thunderbird will continue with an unencrypted connection, causing email data to be sent without protection. This vulnerability affects Thunderbird < 68.9.0.

CVSS Metrics

• v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
• v2.0•MEDIUM•Score: 4.3AV:N/AC:M/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.26%• Percentile: 50%

Techniques & Countermeasures

• CWE-319•Cleartext Transmission of Sensitive Information

  The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.

Affected Systems

• canonical•ubuntu_linux

  16.04 | 18.04 | 19.10 | 20.04

• mozilla•thunderbird

  < 68.9.0 | ≥ unspecified, < 68.9.0

References (3)

• https://www.mozilla.org/security/advisories/mfsa2020-22/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1613623
• https://usn.ubuntu.com/4421-1/