CVE-2020-11810

Publication date 27 April 2020

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

3.7 · Low

Score breakdown

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.

Status

Package Ubuntu Release Status
openvpn 21.04 hirsute
Not affected
20.10 groovy
Not affected
20.04 LTS focal
Fixed 2.4.7-1ubuntu2.20.04.2
19.10 eoan Ignored end of life
18.04 LTS bionic
Fixed 2.4.4-2ubuntu1.5
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
openvpn

Severity score breakdown

Parameter Value
Base score 3.7 · Low
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact Low
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Related Ubuntu Security Notices (USN)

Other references