CVE-2020-11810

An issue was discovered in OpenVPN 2.4.x before 2.4.9. An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.

Link	Resource
https://community.openvpn.net/openvpn/ticket/1272	Exploit Vendor Advisory
https://security-tracker.debian.org/tracker/CVE-2020-11810	Third Party Advisory
https://patchwork.openvpn.net/patch/1079/	Patch Vendor Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1169925	Issue Tracking Third Party Advisory
https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab	Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FGHHV4YZANZW45KZTJJGVGPFMSXYRCKZ/	Mailing List Patch
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JII7RYYYRBPQNEGGVSOXCM7JUZ43T3VH/	Mailing List Patch
https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html	Mailing List Third Party Advisory

Configuration 1

cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*

---

Published : 2020-04-27 03:15

Updated : 2022-05-12 08:14

---

NVD link : CVE-2020-11810

Mitre link : CVE-2020-11810

No products.

CWE-362