Information disclosure in Mozilla Thunderbird - CVE-2019-11739

Vulnerability identifier: #VU21106

CSH Severity: Low

CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-11739

CWE-ID: CWE-200

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to an error when processing multipart messages. A remote attacker can create a specially crafted multipart/alternative message that can leak encrypted S/MIME parts when included in a a HTML reply/forward.

Mozilla Thunderbird
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for x86_64
thunderbird (Debian package)
thunderbird (Ubuntu package)

Install updates from vendor's website.

Mozilla Thunderbird - addressed in versions 68.1.0, 60.9.0
thunderbird (Debian package) - addressed in versions 1:60.9.0-1~deb9u1, 1:60.9.0-1~deb10u1
thunderbird (Ubuntu package) - addressed in versions 1:60.9.0+build1-0ubuntu0.16.04.2, 1:60.9.0+build1-0ubuntu0.18.04.1, 1:60.9.0+build1-0ubuntu0.19.04.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2019-30/

• Multiple vulnerabilities in Mozilla Thunderbird
• Debian update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Ubuntu update for Thunderbird