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CVE-2020-15127— Denial of service in Contour

Quick assessment

Affected
projectcontour contour
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Contour是一款使用Envoy代理的Kubernetes入口控制器。 Contour 1.7.0之前版本中存在访问控制错误漏洞。该漏洞源于网络系统或产品未正确限制来自未授权角色的资源访问。

CVSS 7.5 · High EPSS 1.38% · P72
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I. Basic Information for CVE-2020-15127

Vulnerability Information
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Vulnerability Title
Denial of service in Contour
Source: CVE Program / CVE List V5
Vulnerability Description
In Contour ( Ingress controller for Kubernetes) before version 1.7.0, a bad actor can shut down all instances of Envoy, essentially killing the entire ingress data plane. GET requests to /shutdown on port 8090 of the Envoy pod initiate Envoy's shutdown procedure. The shutdown procedure includes flipping the readiness endpoint to false, which removes Envoy from the routing pool. When running Envoy (For example on the host network, pod spec hostNetwork=true), the shutdown manager's endpoint is accessible to anyone on the network that can reach the Kubernetes node that's running Envoy. There is no authentication in place that prevents a rogue actor on the network from shutting down Envoy via the shutdown manager endpoint. Successful exploitation of this issue will lead to bad actors shutting down all instances of Envoy, essentially killing the entire ingress data plane. This is fixed in version 1.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Contour 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Contour是一款使用Envoy代理的Kubernetes入口控制器。 Contour 1.7.0之前版本中存在访问控制错误漏洞。该漏洞源于网络系统或产品未正确限制来自未授权角色的资源访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
projectcontour contour < 1.7.0 -

II. Public POCs for CVE-2020-15127

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III. Intelligence Information for CVE-2020-15127

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Vendor Advisories for CVE-2020-15127 (1)

Other References for CVE-2020-15127 (1)

IV. Related Vulnerabilities

Same product: contour
Same vendor: projectcontour
Same weakness: CWE-306

V. Comments for CVE-2020-15127

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