CVE-2020-15104: TLS Validation Vulnerability in Envoy
First published: Tue Jul 14 2020(Updated: )
In Envoy before versions 1.12.6, 1.13.4, 1.14.4, and 1.15.0 when validating TLS certificates, Envoy would incorrectly allow a wildcard DNS Subject Alternative Name apply to multiple subdomains. For example, with a SAN of *.example.com, Envoy would incorrectly allow nested.subdomain.example.com, when it should only allow subdomain.example.com. This defect applies to both validating a client TLS certificate in mTLS, and validating a server TLS certificate for upstream connections. This vulnerability is only applicable to situations where an untrusted entity can obtain a signed wildcard TLS certificate for a domain of which you only intend to trust a subdomain of. For example, if you intend to trust api.mysubdomain.example.com, and an untrusted actor can obtain a signed TLS certificate for *.example.com or *.com. Configurations are vulnerable if they use verify_subject_alt_name in any Envoy version, or if they use match_subject_alt_names in version 1.14 or later. This issue has been fixed in Envoy versions 1.12.6, 1.13.4, 1.14.4, 1.15.0.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Envoyproxy Envoy | <1.12.6 | |
| Envoyproxy Envoy | >=1.13.0<1.13.4 | |
| Envoyproxy Envoy | >=1.14.0<1.14.4 |
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Frequently Asked Questions
What is CVE-2020-15104?
CVE-2020-15104 is a vulnerability in Envoy that allows a wildcard DNS Subject Alternative Name to apply to multiple subdomains.
Which versions of Envoy are affected by CVE-2020-15104?
Versions 1.12.6, 1.13.4, 1.14.4, and 1.15.0 of Envoy are affected by CVE-2020-15104.
How does CVE-2020-15104 impact TLS certificate validation in Envoy?
CVE-2020-15104 allows a wildcard DNS Subject Alternative Name to be incorrectly applied to multiple subdomains during TLS certificate validation in Envoy.
What is the severity of CVE-2020-15104?
CVE-2020-15104 has a severity rating of medium, with a CVSS score of 5.4.
How can I fix CVE-2020-15104?
To fix CVE-2020-15104, update Envoy to versions 1.12.6, 1.13.4, 1.14.4, or 1.15.0.
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