NULL pointer dereference in Mozilla Thunderbird - CVE-2020-6795

Vulnerability identifier: #VU25128

CSH Severity: Medium

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-6795

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error when processing messages with multiple S/MIME signatures. A remote attacker can send a specially crafted email message tho the victim and crash the application.

Mozilla Thunderbird
Arch Linux
Gentoo Linux
CentOS
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for x86_64
Slackware Linux
Opensuse
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
thunderbird (Debian package)
thunderbird (Ubuntu package)
thunderbird (Alpine package)

Install updates from vendor's website.

Mozilla Thunderbird - update to 68.5.0
thunderbird (Debian package) - addressed in versions 1:68.5.0-1~deb9u1, 1:68.5.0-1~deb10u1
thunderbird (Ubuntu package) - update to 1:68.7.0+build1-0ubuntu0.16.04.2
thunderbird (Alpine package) - update to 68.5.0-r0

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-07/

• Multiple vulnerabilities in Mozilla Thunderbird
• Slackware Linux update for mozilla-thunderbird
• Arch Linux update for thunderbird
• Debian update for thunderbird
• OpenSUSE Linux update for MozillaThunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Red Hat update for thunderbird
• Gentoo update for Mozilla Thunderbird
• CentOS 7 update for thunderbird
• CentOS 6 update for thunderbird
• Ubuntu update for Thunderbird
• NULL pointer dereference in thunderbird (Alpine package)