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Security Advisories: GSA_kwCzR0hTQS1qODZ2LTJ2anItZmc4Zs4AA5Cm

Etcd Gateway TLS endpoint validation only confirms TCP reachability

Vulnerability type

Cryptography

Workarounds

Refer to the gateway documentation. The vulnerability was spotted due to unclear documentation of how the gateway handles endpoints validation.

Detail

Secure endpoint validation is performed by the etcd gateway start command when the --discovery-srv flag is enabled. However, as currently implemented, it only validates TCP reachability, effectively allowing connections to an endpoint that doesn't accept TLS connections through the HTTPS URL. The auditors has noted that appropriate documentation of this validation functionality plus deprecation of this misleading functionality is an acceptable path forward.

References

Find out more on this vulnerability in the security audit report

For more information

If you have any questions or comments about this advisory:

Permalink: https://github.com/advisories/GHSA-j86v-2vjr-fg8f
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1qODZ2LTJ2anItZmc4Zs4AA5Cm
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 27 days ago
Updated: 27 days ago


Identifiers: GHSA-j86v-2vjr-fg8f
References:

Affected Packages

go:go.etcd.io/etcd
Versions: < 3.3.23, >= 3.4.0-rc.0, <= 3.4.9
Fixed in: 3.3.23, 3.4.10