CVE-2024-32475
Envoy RELEASE_ASSERT using auto_sni with :authority header > 255 bytes
Envoy is a cloud-native, open source edge and service proxy. When an upstream TLS cluster is used with `auto_sni` 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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| envoy envoyproxy |
>= 1.30.0, < 1.30.1 (affected) >= 1.29.0, < 1.29.4 (affected) >= 1.28.0, < 1.28.3 (affected) >= 1.13.0, < 1.27.5 (affected) |
CNA: GitHub_M |
| envoy envoyproxy |
≥ 1.13.0; < 1.27.5 (affected, semver)
Other versions: unknown |
ADP: CISA-ADP |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-3mh5-6q8v-25wjCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/envoyproxy/envoy/commit/b47fc6648d7c2dfe0093a601d44cb704b7bad382CNA: GitHub_M · x_refsource_MISC
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-3mh5-6q8v-25wjADP: CVE · x_refsource_CONFIRM, x_transferred
- https://github.com/envoyproxy/envoy/commit/b47fc6648d7c2dfe0093a601d44cb704b7bad382ADP: CVE · x_refsource_MISC, x_transferred
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