CVE-2021-32783

Published on: 07/23/2021 12:00:00 AM UTC

Last Modified on: 08/05/2021 04:56:00 PM UTC

CVE-2021-32783 - advisory for GHSA-5ph6-qq5x-7jwc

Source: Mitre Source: Nist Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H

Certain versions of Contour from Projectcontour contain the following vulnerability:

Contour is a Kubernetes ingress controller using Envoy proxy. In Contour before version 1.17.1 a specially crafted ExternalName type Service may be used to access Envoy's admin interface, which Contour normally prevents from access outside the Envoy container. This can be used to shut down Envoy remotely (a denial of service), or to expose the existence of any Secret that Envoy is using for its configuration, including most notably TLS Keypairs. However, it *cannot* be used to get the *content* of those secrets. Since this attack allows access to the administration interface, a variety of administration options are available, such as shutting down the Envoy or draining traffic. In general, the Envoy admin interface cannot easily be used for making changes to the cluster, in-flight requests, or backend services, but it could be used to shut down or drain Envoy, change traffic routing, or to retrieve secret metadata, as mentioned above. The issue will be addressed in Contour v1.18.0 and a cherry-picked patch release, v1.17.1, has been released to cover users who cannot upgrade at this time. For more details refer to the linked GitHub Security Advisory.

  • CVE-2021-32783 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • Affected Vendor/Software: URL Logo projectcontour - contour version < 1.17.1

CVSS3 Score: 8.5 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW LOW NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
CHANGED LOW NONE HIGH

CVSS2 Score: 5.5 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK LOW SINGLE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
PARTIAL NONE PARTIAL

CVE References

Description Tags Link
ExternalName Services can be used to gain access to Envoy's admin interface · Advisory · projectcontour/contour · GitHub github.com
text/html
URL Logo CONFIRM github.com/projectcontour/contour/security/advisories/GHSA-5ph6-qq5x-7jwc
Release Contour v1.17.1 · projectcontour/contour · GitHub github.com
text/html
URL Logo MISC github.com/projectcontour/contour/releases/tag/v1.17.1
cherrypicks for v1.17.1 (#3909) · projectcontour/[email protected] · GitHub github.com
text/html
URL Logo MISC github.com/projectcontour/contour/commit/b53a5c4fd927f4ea2c6cf02f1359d8e28bef852e

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationProjectcontourContourAllAllAllAll
  • cpe:2.3:a:projectcontour:contour:*:*:*:*:*:kubernetes:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-32783 : Contour is a Kubernetes ingress controller using Envoy proxy. In Contour before version 1.17.1 a s… twitter.com/i/web/status/1… 2021-07-23 21:55:46
Twitter Icon @LinInfoSec Kubernetes - CVE-2021-32783: github.com/projectcontour… 2021-07-24 01:20:32
Reddit Logo Icon /r/netcve CVE-2021-32783 2021-07-23 22:38:28
© CVE.report 2021 Twitter Nitter Twitter Viewer |

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