Division by zero in OpenVPN for Windows - CVE-2023-46849

Vulnerability identifier: #VU82952

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-46849

CWE-ID: CWE-369

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to server incorrectly restores "--fragment" configuration under certain circumstances. A remote client can cause a divide by zero error and perform a denial of service (DoS) attack.

OpenVPN for Windows
Debian Linux
Gentoo Linux
Ubuntu
Fedora
openvpn (Ubuntu package)
openvpn (Debian package)
net-vpn/openvpn
openvpn
IBM MaaS360 Cloud Extender Agent
IBM MaaS360 Mobile Enterprise Gateway
IBM MaaS360 VPN Module

Install updates from vendor's website.

OpenVPN for Windows - update to 2.6.7
openvpn (Ubuntu package) - addressed in versions 2.6.1-1ubuntu1.1, 2.6.5-0ubuntu1.1
openvpn (Debian package) - update to 2.6.3-1+deb12u2
net-vpn/openvpn - update to 2.6.7
openvpn - addressed in versions 2.6.7-1.fc38, 2.6.7-1.fc39, 2.6.8-1.fc38, 2.6.8-1.fc39
IBM MaaS360 Cloud Extender Agent - update to 3.000.300.025
IBM MaaS360 VPN Module - update to 3.000.400
IBM MaaS360 Mobile Enterprise Gateway - update to 3.000.400

• https://github.com/OpenVPN/openvpn/blob/v2.6.7/Changes.rst

• Multiple vulnerabilities in OpenVPN
• Fedora 38 update for openvpn
• Fedora 39 update for openvpn
• Debian update for openvpn
• Ubuntu update for openvpn
• Fedora 38 update for openvpn
• Fedora 39 update for openvpn
• Multiple vulnerabilities in IBM MaaS360 Cloud Extender Agent, Mobile Enterprise Gateway and VPN Module
• Gentoo update for OpenVPN