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Ubuntu: USN-4933-1 (CVE-2020-11810): OpenVPN vulnerabilities

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Ubuntu: USN-4933-1 (CVE-2020-11810): OpenVPN vulnerabilities

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:N/A:P)
Published
04/13/2020
Created
05/07/2021
Added
05/05/2021
Modified
05/05/2021

Description

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.

Solution(s)

  • ubuntu-upgrade-openvpn

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