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.
Weakness
The product divides a value by zero.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openvpn | Openvpn | 2.6.0 (including) | 2.6.6 (including) |
| Openvpn_access_server | Openvpn | 2.11.0 (including) | 2.11.3 (including) |
| Openvpn_access_server | Openvpn | 2.12.0 (including) | 2.12.0 (including) |
| Openvpn_access_server | Openvpn | 2.12.1 (including) | 2.12.1 (including) |
| Openvpn | Ubuntu | bionic | * |
| Openvpn | Ubuntu | lunar | * |
| Openvpn | Ubuntu | mantic | * |
| Openvpn | Ubuntu | trusty | * |
| Openvpn | Ubuntu | upstream | * |
| Openvpn | Ubuntu | xenial | * |
References
- 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://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