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ubuntucveUbuntu.comUB:CVE-2021-3618
HistoryMar 23, 2022 - 12:00 a.m.

CVE-2021-3618

2022-03-2300:00:00
ubuntu.com
ubuntu.com
136

7.4 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

5.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:P/A:N

0.001 Low

EPSS

Percentile

43.8%

JSON

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.

Bugs

Notes

Author Note
mdeslaur the mail proxy mechanisms aren’t included in nginx.conf by default
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchnginx< 1.14.0-0ubuntu1.10UNKNOWN
ubuntu20.04noarchnginx< 1.18.0-0ubuntu1.3UNKNOWN
ubuntu21.10noarchnginx< 1.18.0-6ubuntu11.1UNKNOWN
ubuntu22.04noarchnginx< 1.18.0-6ubuntu14.1UNKNOWN
ubuntu14.04noarchnginx< anyUNKNOWN
ubuntu16.04noarchnginx< 1.10.3-0ubuntu0.16.04.5+esm3) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu18.04noarchsendmail< anyUNKNOWN
ubuntu20.04noarchsendmail< anyUNKNOWN
ubuntu22.04noarchsendmail< anyUNKNOWN
ubuntu14.04noarchsendmail< anyUNKNOWN
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1-10 of 151

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7.4 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

5.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:P/A:N

0.001 Low

EPSS

Percentile

43.8%

JSON
Related for UB:CVE-2021-3618
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