CVE-2020-11810
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
1Exploited in Wild
-Decision
Descriptions
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.
Se detectó un problema en OpenVPN versiones 2.4.x versiones anteriores a 2.4.9. Un atacante puede inyectar un paquete de canal de datos v2 (P_DATA_V2) usando el peer-id de la víctima. Normalmente, estos paquetes son eliminados, pero si este paquete llega antes de que se hayan inicializado los parámetros de cifrado del canal de datos, se eliminará la conexión de la víctima. Esto requiere una sincronización cuidadosa debido a una pequeña ventana de tiempo (normalmente unos pocos segundos) entre el inicio de la conexión del cliente víctima y la respuesta PUSH_REPLY del servidor al cliente. Este ataque sólo funcionará si Negotiable Cipher Parameters (NCP) está en uso.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2020-04-15 CVE Reserved
- 2020-04-27 CVE Published
- 2024-08-04 CVE Updated
- 2024-08-04 First Exploit
- 2024-08-21 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CAPEC
References (8)
| URL | Tag | Source |
|---|---|---|
| https://bugzilla.suse.com/show_bug.cgi?id=1169925 | Issue Tracking | |
| https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html | Mailing List |
|
| https://security-tracker.debian.org/tracker/CVE-2020-11810 | Third Party Advisory |
| URL | Date | SRC |
|---|---|---|
| https://community.openvpn.net/openvpn/ticket/1272 | 2024-08-04 |
| URL | Date | SRC |
|---|---|---|
| https://github.com/OpenVPN/openvpn/commit/37bc691e7d26ea4eb61a8a434ebd7a9ae76225ab | 2023-11-07 | |
| https://patchwork.openvpn.net/patch/1079 | 2023-11-07 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Openvpn Search vendor "Openvpn" | Openvpn Search vendor "Openvpn" for product "Openvpn" | >= 2.4.0 < 2.4.9 Search vendor "Openvpn" for product "Openvpn" and version " >= 2.4.0 < 2.4.9" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0" | - |
Affected
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| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 30 Search vendor "Fedoraproject" for product "Fedora" and version "30" | - |
Affected
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| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 32 Search vendor "Fedoraproject" for product "Fedora" and version "32" | - |
Affected
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