Vulnerability Name:

CVE-2020-11810 (CCN-181000)

Assigned:2020-04-15
Published:2020-04-15
Updated:2022-05-12
Summary: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.
CVSS v3 Severity:3.7 Low (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)
3.2 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-362
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-11810

Source: CONFIRM
Type: Issue Tracking, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1169925

Source: CONFIRM
Type: Exploit, Vendor Advisory
https://community.openvpn.net/openvpn/ticket/1272

Source: XF
Type: UNKNOWN
openvpn-cve202011810-sec-bypass(181000)

Source: CCN
Type: openvpn GIT Repository
Fix illegal client float (CVE-2020-11810)

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab

Source: MLIST
Type: Mailing List, Third Party Advisory
[debian-lts-announce] 20220503 [SECURITY] [DLA 2992-1] openvpn security update

Source: FEDORA
Type: Mailing List, Patch, Third Party Advisory
FEDORA-2020-c1cb4ebcd9

Source: FEDORA
Type: Mailing List, Patch, Third Party Advisory
FEDORA-2020-969414e05b

Source: CONFIRM
Type: Patch, Vendor Advisory
https://patchwork.openvpn.net/patch/1079/

Source: CCN
Type: Ubuntu CVE Tracker
CVE-2020-11810

Source: MISC
Type: Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2020-11810

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2020-11810

Vulnerable Configuration:Configuration 1:
  • cpe:/a:openvpn:openvpn:*:*:*:*:*:*:*:* (Version >= 2.4.0 and < 2.4.9)

  • Configuration 2:
  • cpe:/o:debian:debian_linux:8.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

  • Configuration 3:
  • cpe:/o:fedoraproject:fedora:30:*:*:*:*:*:*:*
  • OR cpe:/o:fedoraproject:fedora:32:*:*:*:*:*:*:*

  • Configuration CCN 1:
  • cpe:/a:openvpn:openvpn:2.4.8:*:*:*:*:*:*:*
  • AND
  • cpe:/o:canonical:ubuntu:16.04::~~lts~~~:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu:18.04::~~lts~~~:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu:12.04::~~esm~~~:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu:14.04::~~esm~~~:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu:20.04::~~lts~~~:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu:20.10:*:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:7727
    P
    openvpn-2.5.6-150400.3.6.1 on GA media (Moderate)
    2023-06-12
    oval:org.opensuse.security:def:696
    P
    Security update for webkit2gtk3 (Important)
    2022-08-16
    oval:org.opensuse.security:def:3597
    P
    libgme0-0.6.0-5.1 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3133
    P
    libXRes1-1.0.7-3.53 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:3407
    P
    xorg-x11-libs-7.6-45.14 on GA media (Moderate)
    2022-06-28
    oval:org.opensuse.security:def:94519
    P
    clamav-0.103.5-3.35.1 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:94763
    P
    openvpn-2.5.5-150400.1.5 on GA media (Moderate)
    2022-06-22
    oval:org.opensuse.security:def:95233
    P
    Security update for ucode-intel (Moderate)
    2022-05-18
    oval:org.opensuse.security:def:6009
    P
    Security update for the Linux Kernel (Important)
    2022-04-14
    oval:org.opensuse.security:def:113069
    P
    openvpn-2.5.3-1.2 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:101946
    P
    Security update for the Linux Kernel (Live Patch 2 for SLE 15 SP3) (Important)
    2021-12-14
    oval:org.opensuse.security:def:106507
    P
    openvpn-2.5.3-1.2 on GA media (Moderate)
    2021-10-01
    oval:org.opensuse.security:def:101232
    P
    python3-bottle-0.12.13-3.3.1 on GA media (Moderate)
    2021-08-09
    oval:org.opensuse.security:def:111385
    P
    Security update for openvpn (Moderate)
    2021-05-15
    oval:org.opensuse.security:def:64496
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:96941
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:117413
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:73808
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:107898
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:64686
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:5685
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:75842
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:108612
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:66774
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:76166
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:67098
    P
    Security update for openvpn (Moderate)
    2021-05-12
    oval:org.opensuse.security:def:73618
    P
    Security update for openvpn (Moderate)
    2021-05-12
    BACK
    openvpn openvpn *
    debian debian linux 8.0
    debian debian linux 9.0
    debian debian linux 10.0
    fedoraproject fedora 30
    fedoraproject fedora 32
    openvpn openvpn 2.4.8
    canonical ubuntu 16.04
    canonical ubuntu 18.04
    canonical ubuntu 12.04
    canonical ubuntu 14.04
    canonical ubuntu 20.04
    canonical ubuntu 20.10