Alpaquita Linux
Security Advisory

CVE-2021-3618

Published: August 31, 2023Last modified: August 31, 2023

Description

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 score breakdown

ParameterValue
Base score7.4
Attack VectorNETWORK
Attack complexityHIGH
Privileges requiredNONE
User interactionNONE
ScopeUNCHANGED
ConfidentialityHIGH
Integrity impactHIGH
Availability impactNONE
VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Status

ProductReleasePackageStatus
Alpaquita Linux23 LTSnginxNot affected (1.22.1-r0)
StreamnginxNot affected (1.24.0-r11)

References

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