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Improper Certificate Validation Affecting nginx package, versions <1.14.2-2+deb10u5

0.0
high

Snyk CVSS

    Attack Complexity High
    Confidentiality High
    Integrity High

    Threat Intelligence

    EPSS 0.11% (44th percentile)
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NVD
7.4 high
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SUSE
7.4 high
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Red Hat
7.4 high

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  • Snyk ID SNYK-DEBIAN10-NGINX-1320230
  • published 21 Jul 2021
  • disclosed 23 Mar 2022
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Introduced: 21 Jul 2021

CVE-2021-3618 Open this link in a new tab
CWE-295 Open this link in a new tab

How to fix?

Upgrade Debian:10 nginx to version 1.14.2-2+deb10u5 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:10 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.