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  5. CVE-2021-25737

CVE-2021-25737: URL Redirection to Untrusted Site (Open Redirect)

September 6, 2021 (updated October 7, 2021)

A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.

References

  • nvd.nist.gov/vuln/detail/CVE-2021-25737

Code Behaviors & Features

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Affected versions

All versions starting from 1.16.0 before 1.18.19, all versions starting from 1.19.0 before 1.19.10, all versions starting from 1.20.0 before 1.20.7, all versions starting from version 1.21.0 before 1.21.1

Fixed versions

  • 1.18.19
  • 1.19.10
  • 1.20.7
  • 1.21.1

Solution

Upgrade to version 1.18.19, 1.19.10, 1.20.7, 1.21.1 or above.

Impact 4.8 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Learn more about CVSS

Source file

go/k8s.io/kubernetes/pkg/apis/apps/validation/CVE-2021-25737.yml

Spotted a mistake? Edit the file on GitLab.

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