CVE-2021-3618

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-3618
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.

7.4 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.8 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:M/Au:N/C:P/I:P/A:N

Exploitability : 8.6 / Impact : 4.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

References
Link Resource
https://alpaca-attack.com/ Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1975623 Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00031.html Mailing List Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:a:sendmail:sendmail:*:*:*:*:*:*:*:*

Configuration 3 (hide)

cpe:2.3:a:vsftpd_project:vsftpd:*:*:*:*:*:*:*:*

Configuration 4 (hide)

OR cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

Configuration 5 (hide)

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
History

23 Nov 2022, 02:15

Type Values Removed Values Added
References
  • (MLIST) https://lists.debian.org/debian-lts-announce/2022/11/msg00031.html -

27 Oct 2022, 15:58

Type Values Removed Values Added
References (MISC) https://alpaca-attack.com/ - (MISC) https://alpaca-attack.com/ - Third Party Advisory

13 Sep 2022, 15:15

Type Values Removed Values Added
References
  • {'url': 'https://github.com/nginx/nginx/commit/173f16f736c10eae46cd15dd861b04b82d91a37a', 'name': 'https://github.com/nginx/nginx/commit/173f16f736c10eae46cd15dd861b04b82d91a37a', 'tags': ['Patch', 'Third Party Advisory'], 'refsource': 'MISC'}
  • {'url': 'https://ubuntu.com/security/CVE-2021-3618', 'name': 'https://ubuntu.com/security/CVE-2021-3618', 'tags': ['Exploit', 'Third Party Advisory'], 'refsource': 'MISC'}
  • {'url': 'https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991329', 'name': 'https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991329', 'tags': ['Exploit', 'Mailing List', 'Release Notes', 'Third Party Advisory'], 'refsource': 'MISC'}
  • {'url': 'https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991331', 'name': 'https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991331', 'tags': ['Exploit', 'Mailing List', 'Patch', 'Third Party Advisory'], 'refsource': 'MISC'}
  • {'url': 'https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991328', 'name': 'https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991328', 'tags': ['Exploit', 'Mailing List', 'Patch', 'Third Party Advisory'], 'refsource': 'MISC'}
  • (MISC) https://alpaca-attack.com/ -

04 Apr 2022, 20:46

Type Values Removed Values Added
CPE cpe:2.3:a:sendmail:sendmail:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*
cpe:2.3:a:vsftpd_project:vsftpd:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
CWE CWE-295
References (MISC) https://github.com/nginx/nginx/commit/173f16f736c10eae46cd15dd861b04b82d91a37a - (MISC) https://github.com/nginx/nginx/commit/173f16f736c10eae46cd15dd861b04b82d91a37a - Patch, Third Party Advisory
References (MISC) https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991328 - (MISC) https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991328 - Exploit, Mailing List, Patch, Third Party Advisory
References (MISC) https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991329 - (MISC) https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991329 - Exploit, Mailing List, Release Notes, Third Party Advisory
References (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=1975623 - (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=1975623 - Issue Tracking, Patch, Third Party Advisory
References (MISC) https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991331 - (MISC) https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991331 - Exploit, Mailing List, Patch, Third Party Advisory
References (MISC) https://ubuntu.com/security/CVE-2021-3618 - (MISC) https://ubuntu.com/security/CVE-2021-3618 - Exploit, Third Party Advisory
CVSS v2 : unknown
v3 : unknown 		v2 : 5.8
v3 : 7.4

23 Mar 2022, 20:15

Type Values Removed Values Added
New CVE
Information

Published : 2022-03-23 20:15

Updated : 2024-02-04 22:29

NVD link : CVE-2021-3618

Mitre link : CVE-2021-3618

CVE.ORG link : CVE-2021-3618

JSON object : View

Products Affected

debian

  • debian_linux

f5

  • nginx

vsftpd_project

  • vsftpd

fedoraproject

  • fedora

sendmail

  • sendmail
CWE
CWE-295

Improper Certificate Validation