CVE-2023-46849: Divide by Zero
First published: Sat Nov 11 2023(Updated: )
Using the --fragment option in certain configuration setups OpenVPN version 2.6.0 to 2.6.6 allows an attacker to trigger a divide by zero behaviour which could cause an application crash, leading to a denial of service.
Credit: security@openvpn.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/openvpn | 2.4.7-1+deb10u1 2.5.1-3 2.6.3-1+deb12u2 2.6.7-1 | |
| >=2.6.0<=2.6.6 | ||
| >=2.11.0<=2.11.3 | ||
| =2.12.0 | ||
| =2.12.1 | ||
| =12.0 | ||
| =39 |
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Reference Links
- https://community.openvpn.net/openvpn/wiki/CVE-2023-46849
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L3FS46ANNTAVLIQY56ZKGM5CBTRVBUNE/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O54I7D753V6PU6XBU26FEROD2DSHEJQ4/
- https://openvpn.net/security-advisory/access-server-security-update-cve-2023-46849-cve-2023-46850/
- https://www.debian.org/security/2023/dsa-5555
- https://github.com/OpenVPN/openvpn/commit/1cfca659244e362f372d9843351257f456392a2f
- https://security-tracker.debian.org/tracker/CVE-2023-46849
Frequently Asked Questions
What is CVE-2023-46849?
CVE-2023-46849 is a vulnerability in OpenVPN version 2.6.0 to 2.6.6 that allows an attacker to trigger a divide by zero behavior, leading to a denial of service.
How does CVE-2023-46849 impact OpenVPN?
CVE-2023-46849 can cause an application crash in OpenVPN, resulting in a denial of service.
Which versions of OpenVPN are affected by CVE-2023-46849?
OpenVPN versions 2.6.0 to 2.6.6 are affected by CVE-2023-46849.
How can an attacker exploit CVE-2023-46849?
An attacker can exploit CVE-2023-46849 by using the --fragment option in certain configuration setups.
How can I mitigate the CVE-2023-46849 vulnerability?
To mitigate the CVE-2023-46849 vulnerability, update OpenVPN to version 2.6.7 or apply the appropriate security patches as recommended by your software provider.
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- version/openvpn openvpn access server/2.11.0
- version/openvpn openvpn access server/2.11.3
- version/openvpn openvpn access server/2.12.0
- version/openvpn openvpn access server/2.12.1
- vendor/debian
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