QID 352825

Date Published: 2021-09-15

QID 352825: Amazon Linux Security Advisory for nginx: AL2012-2021-349

Package updates are available for amazon linux that fix the following vulnerabilities:
cve-2021-3618: 1975623: cve-2021-3618 alpaca: application layer protocol confusion - analyzing and mitigating cracks in tls authentication 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.


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.

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as Medium - 4.2 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Administrators are advised to apply the appropriate software updates.
    Vendor References

    CVEs related to QID 352825

    CVE-2021-3618 |
    Software Advisories
    Advisory ID Software Component Link
    AL2012-2021-349 Amazon Linux Bare Metal URL Logo docs.aws.amazon.com/AWSEC2/latest/UserGuide/install-updates.html
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