ubuntu-cve-2021-3618
Vulnerability from osv_ubuntu
Published
2022-03-23 20:15
Modified
2026-07-02 15:50
Summary
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.
Severity
7.4 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
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{
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{
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{
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{
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{
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{
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{
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{
"binary_name": "sensible-mda",
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]
},
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{
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{
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{
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{
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{
"binary_name": "libnginx-mod-http-headers-more-filter",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-http-image-filter",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-http-ndk",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-http-perl",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-http-subs-filter",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-http-uploadprogress",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-http-upstream-fair",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-http-xslt-filter",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-mail",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-nchan",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-rtmp",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-stream",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-stream-geoip",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "libnginx-mod-stream-geoip2",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "nginx",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "nginx-common",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "nginx-core",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "nginx-extras",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "nginx-full",
"binary_version": "1.18.0-6ubuntu14.1"
},
{
"binary_name": "nginx-light",
"binary_version": "1.18.0-6ubuntu14.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.18.0-6ubuntu14.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-6ubuntu14.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.18.0-6ubuntu11",
"1.18.0-6ubuntu12",
"1.18.0-6ubuntu14"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libmilter1.0.1",
"binary_version": "8.15.2-22ubuntu3"
},
{
"binary_name": "rmail",
"binary_version": "8.15.2-22ubuntu3"
},
{
"binary_name": "sendmail",
"binary_version": "8.15.2-22ubuntu3"
},
{
"binary_name": "sendmail-base",
"binary_version": "8.15.2-22ubuntu3"
},
{
"binary_name": "sendmail-bin",
"binary_version": "8.15.2-22ubuntu3"
},
{
"binary_name": "sendmail-cf",
"binary_version": "8.15.2-22ubuntu3"
},
{
"binary_name": "sensible-mda",
"binary_version": "8.15.2-22ubuntu3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "sendmail",
"purl": "pkg:deb/ubuntu/sendmail@8.15.2-22ubuntu3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"8.15.2-22ubuntu2",
"8.15.2-22ubuntu3"
]
}
],
"aliases": [],
"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\u0027s 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.",
"id": "UBUNTU-CVE-2021-3618",
"modified": "2026-07-02T15:50:16Z",
"published": "2022-03-23T20:15:00Z",
"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\u0026m=159394546814125\u0026w=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"
}
],
"related": [
"USN-5371-1",
"USN-5371-2",
"USN-6379-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-3618"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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