Improper Certificate Validation Affecting nginx package, versions <1.20.2-2


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.12% (47th percentile)

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  • Snyk IDSNYK-DEBIAN12-NGINX-1554597
  • published21 Jul 2021
  • disclosed23 Mar 2022

Introduced: 21 Jul 2021

CVE-2021-3618  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade Debian:12 nginx to version 1.20.2-2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nginx package and not the nginx package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

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.

CVSS Scores

version 3.1