CVE-2020-12398 Security feature bypass in Thunderbird

What is CVE-2020-12398?

CVE-2020-12398 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 9 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-319

Which versions are affected by CVE-2020-12398?

It affects 2 products.

Products include Canonical Ubuntu Linux, Mozilla Thunderbird.

How do I fix CVE-2020-12398?

Upgrade to a fixed version.

Is CVE-2020-12398 being exploited?

There is no known exploitation of CVE-2020-12398 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-12398, GHSA-jvxv-vphc-73rg, UBUNTU-CVE-2020-12398.