Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
0

CVE-2021-3618

Disclosure Date: March 23, 2022 •
CVE-2021-3618 CVSS v3 Base Score: 7.4
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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.

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CVSS V3 Severity and Metrics
Base Score:
7.4 High
Impact Score:
5.2
Exploitability Score:
2.2
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector (AV):
Network
Attack Complexity (AC):
High
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
None

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
ALPACA vsftpd 3.0.4, nginx 1.21.0, sendmail 8.17
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • debian,
  • f5,
  • fedoraproject,
  • sendmail,
  • vsftpd project

Products

  • debian linux 10.0,
  • fedora 33,
  • fedora 34,
  • fedora 35,
  • nginx,
  • sendmail,
  • vsftpd
Technical Analysis