QID 355154

Date Published: 2023-05-29

QID 355154: Amazon Linux Security Advisory for sendmail : ALAS2023-2023-018

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. (
( CVE-2021-3618)



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7.4 severity.
  • CVSS V2 rated as Medium - 5.8 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2023-2023-018 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 355154

    CVE-2021-3618 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2023-2023-018 amazon linux 2023 URL Logo alas.aws.amazon.com/AL2023/ALAS-2023-018.html
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