CVE-2021-3618
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
ALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing different protocols but using compatible certificates, such as multi-domain or wildcard certificates. A MiTM attacker having access to victim's traffic at the TCP/IP layer can redirect traffic from one subdomain to another, resulting in a valid TLS session. This breaks the authentication of TLS and cross-protocol attacks may be possible where the behavior of one protocol service may compromise the other at the application layer.
ALPACA es un ataque de confusión de contenido de protocolo de capa de aplicación, que explota servidores TLS que implementan diferentes protocolos pero que usan certificados compatibles, como certificados multidominio o comodín. Un atacante de tipo MiTM que tenga acceso al tráfico de la víctima en la capa TCP/IP puede redirigir el tráfico de un subdominio a otro, resultando en a una sesión TLS válida. Esto rompe la autenticación de TLS y pueden ser posibles los ataques entre protocolos donde el comportamiento de un servicio de protocolo puede comprometer al otro en la capa de aplicación
CVSS Scores
SSVC
- Decision:-
Timeline
- 2021-06-24 CVE Reserved
- 2022-03-23 CVE Published
- 2024-08-03 CVE Updated
- 2024-10-27 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-295: Improper Certificate Validation
CAPEC
References (3)
| URL | Tag | Source |
|---|---|---|
| https://alpaca-attack.com | Third Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00031.html | Mailing List |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1975623 | 2023-02-09 |
| URL | Date | SRC |
|---|
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| F5 Search vendor "F5" | Nginx Search vendor "F5" for product "Nginx" | < 1.21.0 Search vendor "F5" for product "Nginx" and version " < 1.21.0" | - |
Affected
| ||||||
| Sendmail Search vendor "Sendmail" | Sendmail Search vendor "Sendmail" for product "Sendmail" | < 8.17 Search vendor "Sendmail" for product "Sendmail" and version " < 8.17" | - |
Affected
| ||||||
| Vsftpd Project Search vendor "Vsftpd Project" | Vsftpd Search vendor "Vsftpd Project" for product "Vsftpd" | < 3.0.4 Search vendor "Vsftpd Project" for product "Vsftpd" and version " < 3.0.4" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 34 Search vendor "Fedoraproject" for product "Fedora" and version "34" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 35 Search vendor "Fedoraproject" for product "Fedora" and version "35" | - |
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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