Your submission was sent successfully! Close

CVE-2021-3618

Published: 23 March 2022

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.

Notes

AuthorNote
mdeslaur
the mail proxy mechanisms aren't included in nginx.conf by
default
Priority

Low

CVSS 3 base score: 7.4

Status

Package Release Status
nginx
Launchpad, Ubuntu, Debian
bionic
Released (1.14.0-0ubuntu1.10)
focal
Released (1.18.0-0ubuntu1.3)
hirsute Ignored
(reached end-of-life)
impish
Released (1.18.0-6ubuntu11.1)
jammy
Released (1.18.0-6ubuntu14.1)
kinetic Needed

trusty Needed

upstream
Released (1.21.0)
xenial
Released (1.10.3-0ubuntu0.16.04.5+esm3)
Patches:
upstream: http://hg.nginx.org/nginx/rev/ec1071830799
sendmail
Launchpad, Ubuntu, Debian
bionic Needed

focal Needed

hirsute Ignored
(reached end-of-life)
impish Ignored
(reached end-of-life)
jammy Needed

kinetic Needed

trusty Needed

upstream
Released (8.16.1-1)
xenial Ignored
(out of standard support)
vsftpd
Launchpad, Ubuntu, Debian
bionic Needed

focal Needed

hirsute Ignored
(reached end-of-life)
impish Ignored
(reached end-of-life)
jammy Not vulnerable
(3.0.5-0ubuntu1)
kinetic Not vulnerable
(3.0.5-0ubuntu1)
trusty Needed

upstream
Released (3.0.4)
xenial Needed