Stack-based buffer overflow in Mozilla Thunderbird - CVE-2020-26970

Vulnerability identifier: #VU48755

CSH Severity: High

CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-26970

CWE-ID: CWE-121

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when parsing SMTP server responses. A remote attacker can trick the victim to connect to a malicious SMTP server, trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mozilla Thunderbird
Gentoo Linux
Arch Linux
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Oracle Solaris
Ubuntu
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
thunderbird (Debian package)
thunderbird (Red Hat package)
thunderbird (Alpine package)
thunderbird (Ubuntu package)

Install updates from vendor's website.

Mozilla Thunderbird - update to 78.5.1
thunderbird (Debian package) - update to 1:78.5.1-1~deb10u1
thunderbird (Red Hat package) - addressed in versions 78.5.1-1.el7_9, 78.5.1-1.el8_2, 78.5.1-1.el8_3, 78.6.0-1.el8_0, 78.6.0-1.el8_1
thunderbird (Alpine package) - update to 78.5.1-r0
thunderbird (Ubuntu package) - update to 1:78.6.1+build1-0ubuntu0.20.10.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-53/

• Remote code execution in Mozilla Thunderbird
• Debian update for thunderbird
• Gentoo update for Mozilla Thunderbird
• Red Hat Enterprise Linux 8 update for thunderbird
• Red Hat Enterprise Linux 7 update for thunderbird
• Red Hat Enterprise Linux 8.2 update for thunderbird
• Arch Linux update for thunderbird
• Stack-based buffer overflow in thunderbird (Alpine package)
• Red Hat Enterprise Linux 8.1 update for thunderbird
• Red Hat Enterprise Linux 8 update for thunderbird
• Multiple vulnerabilities in Oracle Solaris
• Ubuntu update for thunderbird