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CVE-2021-3618 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.4 HIGH
Vector:  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991328 Exploit  Mailing List  Patch  Third Party Advisory 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991329 Exploit  Mailing List  Release Notes  Third Party Advisory 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=991331 Exploit  Mailing List  Patch  Third Party Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=1975623 Issue Tracking  Patch  Third Party Advisory 
https://github.com/nginx/nginx/commit/173f16f736c10eae46cd15dd861b04b82d91a37a Patch  Third Party Advisory 
https://ubuntu.com/security/CVE-2021-3618 Exploit  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-295 Improper Certificate Validation cwe source acceptance level NIST   Contributor acceptance level Red Hat, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3618
NVD Published Date:
03/23/2022
NVD Last Modified:
04/04/2022
Source:
Red Hat, Inc.