BIT-envoy-2024-32475: Envoy RELEASE_ASSERT using auto_sni with :authority header > 255 bytes

Published Apr 18, 2024
·
Updated

Envoy is a cloud-native, open source edge and service proxy. When an upstream TLS cluster is used with autosni enabled, a request containing a host/:authority header longer than 255 characters triggers an abnormal termination of Envoy process. Envoy does not gracefully handle an error when setting SNI for outbound TLS connection. The error can occur when Envoy attempts to use the host/:authority header value longer than 255 characters as SNI for outbound TLS connection. SNI length is limited to 255 characters per the standard. Envoy always expects this operation to succeed and abnormally aborts the process when it fails. This vulnerability is fixed in 1.30.1, 1.29.4, 1.28.3, and 1.27.5.

Affected Software

1 affected component
Envoy Envoy<1.30.1, <1.29.4, <1.28.3, <1.27.5

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Envoy to a version that resolves this vulnerability.

    Fixed in 1.30.1
  2. Upgrade

    Upgrade Envoy to a version that resolves this vulnerability.

    Fixed in 1.29.4
  3. Upgrade

    Upgrade Envoy to a version that resolves this vulnerability.

    Fixed in 1.28.3
  4. Upgrade

    Upgrade Envoy to a version that resolves this vulnerability.

    Fixed in 1.27.5

Event History

Apr 18, 2024
CVE Published
via OSV·02:18 PM
Data Sourced
via OSV·02:18 PM
DescriptionSeverityWeakness

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203