CVE-2020-11810

 

Published at: - 27-04-2020 05:15

Last modified: - 12-05-2022 10:14

Total changes: - 3

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

 

Verification logic

 

Reference

• https://community.openvpn.net/openvpn/ticket/1272
• https://security-tracker.debian.org/tracker/CVE-2020-11810
• https://patchwork.openvpn.net/patch/1079/
• https://bugzilla.suse.com/show_bug.cgi?id=1169925
• https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab
• FEDORA-2020-c1cb4ebcd9-Mailing List, Patch, Third Party Advisory
• FEDORA-2020-969414e05b-Mailing List, Patch, Third Party Advisory
• [debian-lts-announce] 20220503 [SECURITY] [DLA 2992-1] openvpn security update-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2020-11810

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures