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CVE-2020-11810

Published: 27 April 2020

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.

Priority

Low

CVSS 3 base score: 3.7

Status

Package Release Status
openvpn
Launchpad, Ubuntu, Debian
bionic
Released (2.4.4-2ubuntu1.5)
eoan Ignored
(reached end-of-life)
focal
Released (2.4.7-1ubuntu2.20.04.2)
groovy Not vulnerable
(2.4.9-3ubuntu1)
hirsute Not vulnerable
(2.5.1-1ubuntu1)
precise
Released (2.5.1-1)
trusty Not vulnerable
(code not present)
upstream
Released (2.4.9-1)
xenial Not vulnerable
(code not present)