CVE-2020-15104

描述

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.

如何修補 CVE-2020-15104

要修補 CVE-2020-15104,請將受影響套件升級到下列已修補版本。

• —升級至 1.12.6 或更新版本

CVE-2020-15104 正在被利用嗎?

低 — EPSS 為 0.3%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 1.12.6, >= 1.13.0, < 1.13.4, >= 1.14.0, < 1.14.4

CVSS 分數

參考連結(2)

• WEBgithub.com/envoyproxy/envoy/security/advisories/GHSA-w5f5-6qhq-hhrg
• WEBnvd.nist.gov/vuln/detail/CVE-2020-15104