{"id":"UBUNTU-CVE-2021-3618","details":"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.","modified":"2026-02-04T02:47:38.442549Z","published":"2022-03-23T20:15:00Z","related":["USN-5371-1","USN-5371-2","USN-6379-1"],"upstream":["CVE-2021-3618"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3618"},{"type":"REPORT","url":"https://security.appspot.com/vsftpd/Changelog.txt"},{"type":"REPORT","url":"https://alpaca-attack.com/"},{"type":"REPORT","url":"https://marc.info/?l=sendmail-announce&m=159394546814125&w=2"},{"type":"REPORT","url":"https://lists.exim.org/lurker/message/20210609.200324.f0e073ed.el.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5371-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5371-2"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6379-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-3618"}],"affected":[{"package":{"name":"nginx","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/nginx@1.4.6-1ubuntu3.9+esm5?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.1-3ubuntu1","1.4.3-2ubuntu1","1.4.4-1ubuntu1","1.4.4-2ubuntu1","1.4.4-4ubuntu1","1.4.5-1ubuntu1","1.4.6-1ubuntu2","1.4.6-1ubuntu3","1.4.6-1ubuntu3.1","1.4.6-1ubuntu3.2","1.4.6-1ubuntu3.3","1.4.6-1ubuntu3.4","1.4.6-1ubuntu3.5","1.4.6-1ubuntu3.6","1.4.6-1ubuntu3.7","1.4.6-1ubuntu3.8","1.4.6-1ubuntu3.9","1.4.6-1ubuntu3.9+esm1","1.4.6-1ubuntu3.9+esm2","1.4.6-1ubuntu3.9+esm3","1.4.6-1ubuntu3.9+esm4","1.4.6-1ubuntu3.9+esm5"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-common"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-core"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-extras"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-full"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-light"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-naxsi"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-naxsi-ui"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3618.json"}},{"package":{"name":"sendmail","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/sendmail@8.14.4-4.1ubuntu1.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.14.4-2.1ubuntu4","8.14.4-2.1ubuntu5","8.14.4-4.1ubuntu1","8.14.4-4.1ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_version":"8.14.4-4.1ubuntu1.1","binary_name":"libmilter-dev"},{"binary_version":"8.14.4-4.1ubuntu1.1","binary_name":"libmilter1.0.1"},{"binary_version":"8.14.4-4.1ubuntu1.1","binary_name":"rmail"},{"binary_version":"8.14.4-4.1ubuntu1.1","binary_name":"sendmail"},{"binary_version":"8.14.4-4.1ubuntu1.1","binary_name":"sendmail-base"},{"binary_version":"8.14.4-4.1ubuntu1.1","binary_name":"sendmail-bin"},{"binary_version":"8.14.4-4.1ubuntu1.1","binary_name":"sendmail-cf"},{"binary_version":"8.14.4-4.1ubuntu1.1","binary_name":"sensible-mda"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3618.json"}},{"package":{"name":"vsftpd","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/vsftpd@3.0.2-1ubuntu2.14.04.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.2-1ubuntu2","3.0.2-1ubuntu2.14.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.0.2-1ubuntu2.14.04.1","binary_name":"vsftpd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3618.json"}},{"package":{"name":"nginx","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/nginx@1.10.3-0ubuntu0.16.04.5+esm3?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.3-0ubuntu0.16.04.5+esm3"}]}],"versions":["1.9.3-1ubuntu1","1.9.6-2ubuntu1","1.9.6-2ubuntu2","1.9.9-0ubuntu1","1.9.9-1ubuntu1","1.9.10-0ubuntu1","1.9.10-1ubuntu1","1.9.11-0ubuntu1","1.9.11-0ubuntu2","1.9.12-0ubuntu1","1.9.13-0ubuntu1","1.9.14-0ubuntu1","1.9.15-0ubuntu1","1.10.0-0ubuntu0.16.04.1","1.10.0-0ubuntu0.16.04.2","1.10.0-0ubuntu0.16.04.3","1.10.0-0ubuntu0.16.04.4","1.10.3-0ubuntu0.16.04.1","1.10.3-0ubuntu0.16.04.2","1.10.3-0ubuntu0.16.04.3","1.10.3-0ubuntu0.16.04.4","1.10.3-0ubuntu0.16.04.5","1.10.3-0ubuntu0.16.04.5+esm1","1.10.3-0ubuntu0.16.04.5+esm2"],"ecosystem_specific":{"availability":"Available 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