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CVE-2021-3618

CVE-2021-3618

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.4 · High · EPSS 2.0% · Fix available

Published
Updated

Stack: system · web

Affected products and versions

  • alpaca

    Versions
    • vsftpd 3.0.4, nginx 1.21.0, sendmail 8.17: Affected

    No fix published

  • nginx Debian:12

    Affected ranges
    • ECOSYSTEM: < 1.20.2-2

    Update to 1.20.2-2

  • nginx Debian:13

    Affected ranges
    • ECOSYSTEM: < 1.20.2-2

    Update to 1.20.2-2

  • nginx Debian:14

    Affected ranges
    • ECOSYSTEM: < 1.20.2-2

    Update to 1.20.2-2

  • sendmail Debian:12

    Affected ranges
    • ECOSYSTEM: < 8.16.1-2

    Update to 8.16.1-2

  • sendmail Debian:13

    Affected ranges
    • ECOSYSTEM: < 8.16.1-2

    Update to 8.16.1-2

  • sendmail Debian:14

    Affected ranges
    • ECOSYSTEM: < 8.16.1-2

    Update to 8.16.1-2

  • vsftpd Debian:12

    Versions
    • 3.0.3-13
    • 3.0.3-13.1
    • 3.0.5-0.1
    • 3.0.5-0.2
    • 3.0.5-0.3
    • 3.0.5-0.4
    • 3.0.5-0.5
    • 3.0.5-0.6
    • 3.0.5-0.7
    • 3.0.5-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • vsftpd Debian:13

    Affected ranges
    • ECOSYSTEM: < 3.0.5-0.1

    Update to 3.0.5-0.1

  • vsftpd Debian:14

    Affected ranges
    • ECOSYSTEM: < 3.0.5-0.1

    Update to 3.0.5-0.1

  • nginx Ubuntu:Pro:14.04:LTS

    Versions
    • 1.4.1-3ubuntu1
    • 1.4.3-2ubuntu1
    • 1.4.4-1ubuntu1
    • 1.4.4-2ubuntu1
    • 1.4.4-4ubuntu1
    • 1.4.5-1ubuntu1
    • 1.4.6-1ubuntu2
    • 1.4.6-1ubuntu3
    • 1.4.6-1ubuntu3.1
    • 1.4.6-1ubuntu3.2
    • 1.4.6-1ubuntu3.3
    • 1.4.6-1ubuntu3.4
    • 1.4.6-1ubuntu3.5
    • 1.4.6-1ubuntu3.6
    • 1.4.6-1ubuntu3.7
    • 1.4.6-1ubuntu3.8
    • 1.4.6-1ubuntu3.9
    • 1.4.6-1ubuntu3.9+esm1
    • 1.4.6-1ubuntu3.9+esm2
    • 1.4.6-1ubuntu3.9+esm3
    • 1.4.6-1ubuntu3.9+esm4
    • 1.4.6-1ubuntu3.9+esm5
    • 1.4.6-1ubuntu3.9+esm6
    • 1.4.6-1ubuntu3.9+esm8
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • sendmail Ubuntu:14.04:LTS

    Versions
    • 8.14.4-2.1ubuntu4
    • 8.14.4-2.1ubuntu5
    • 8.14.4-4.1ubuntu1
    • 8.14.4-4.1ubuntu1.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • vsftpd Ubuntu:14.04:LTS

    Versions
    • 3.0.2-1ubuntu2
    • 3.0.2-1ubuntu2.14.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:Pro:16.04:LTS

    Versions
    • 1.9.3-1ubuntu1
    • 1.9.6-2ubuntu1
    • 1.9.6-2ubuntu2
    • 1.9.9-0ubuntu1
    • 1.9.9-1ubuntu1
    • 1.9.10-0ubuntu1
    • 1.9.10-1ubuntu1
    • 1.9.11-0ubuntu1
    • 1.9.11-0ubuntu2
    • 1.9.12-0ubuntu1
    • 1.9.13-0ubuntu1
    • 1.9.14-0ubuntu1
    • 1.9.15-0ubuntu1
    • 1.10.0-0ubuntu0.16.04.1
    • 1.10.0-0ubuntu0.16.04.2
    • 1.10.0-0ubuntu0.16.04.3
    • 1.10.0-0ubuntu0.16.04.4
    • 1.10.3-0ubuntu0.16.04.1
    • 1.10.3-0ubuntu0.16.04.2
    • 1.10.3-0ubuntu0.16.04.3
    • 1.10.3-0ubuntu0.16.04.4
    • 1.10.3-0ubuntu0.16.04.5
    • 1.10.3-0ubuntu0.16.04.5+esm1
    • 1.10.3-0ubuntu0.16.04.5+esm2
    Affected ranges
    • ECOSYSTEM: < 1.10.3-0ubuntu0.16.04.5+esm3

    Update to 1.10.3-0ubuntu0.16.04.5+esm3

  • vsftpd Ubuntu:16.04:LTS

    Versions
    • 3.0.2-20ubuntu1
    • 3.0.3-1ubuntu1
    • 3.0.3-2ubuntu1
    • 3.0.3-3ubuntu2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • sendmail Ubuntu:16.04:LTS

    Versions
    • 8.14.9-4
    • 8.15.2-2
    • 8.15.2-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:18.04:LTS

    Versions
    • 1.12.1-0ubuntu2
    • 1.13.6-2ubuntu1
    • 1.13.6-2ubuntu2
    • 1.13.10-1ubuntu1
    • 1.13.12-0ubuntu1
    • 1.14.0-0ubuntu1
    • 1.14.0-0ubuntu1.1
    • 1.14.0-0ubuntu1.2
    • 1.14.0-0ubuntu1.3
    • 1.14.0-0ubuntu1.4
    • 1.14.0-0ubuntu1.5
    • 1.14.0-0ubuntu1.6
    • 1.14.0-0ubuntu1.7
    • 1.14.0-0ubuntu1.9
    Affected ranges
    • ECOSYSTEM: < 1.14.0-0ubuntu1.10

    Update to 1.14.0-0ubuntu1.10

  • vsftpd Ubuntu:18.04:LTS

    Versions
    • 3.0.3-9
    • 3.0.3-9build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • sendmail Ubuntu:18.04:LTS

    Versions
    • 8.15.2-8ubuntu1
    • 8.15.2-9ubuntu1
    • 8.15.2-10
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:20.04:LTS

    Versions
    • 1.16.1-0ubuntu2
    • 1.16.1-0ubuntu3
    • 1.17.5-0ubuntu1
    • 1.17.6-0ubuntu1
    • 1.17.7-0ubuntu1
    • 1.17.8-0ubuntu1
    • 1.17.8-0ubuntu2
    • 1.17.8-0ubuntu3
    • 1.17.9-0ubuntu1
    • 1.17.9-0ubuntu2
    • 1.17.9-0ubuntu3
    • 1.17.10-0ubuntu1
    • 1.18.0-0ubuntu1
    • 1.18.0-0ubuntu1.2
    Affected ranges
    • ECOSYSTEM: < 1.18.0-0ubuntu1.3

    Update to 1.18.0-0ubuntu1.3

  • vsftpd Ubuntu:20.04:LTS

    Versions
    • 3.0.3-12
    Affected ranges
    • ECOSYSTEM: < 3.0.5-0ubuntu0.20.04.1

    Update to 3.0.5-0ubuntu0.20.04.1

  • sendmail Ubuntu:20.04:LTS

    Versions
    • 8.15.2-13
    • 8.15.2-17ubuntu1
    • 8.15.2-18
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nginx Ubuntu:22.04:LTS

    Versions
    • 1.18.0-6ubuntu11
    • 1.18.0-6ubuntu12
    • 1.18.0-6ubuntu14
    Affected ranges
    • ECOSYSTEM: < 1.18.0-6ubuntu14.1

    Update to 1.18.0-6ubuntu14.1

  • sendmail Ubuntu:22.04:LTS

    Versions
    • 8.15.2-22ubuntu2
    • 8.15.2-22ubuntu3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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