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URL Redirection to Untrusted Site ('Open Redirect')

CVE-2021-25737

Medium
4.8/10

Summary

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. This issue was fixed in versions v1.21.1, v1.20.7, v1.19.11 and v1.18.19.

  • LOW
  • NETWORK
  • LOW
  • CHANGED
  • REQUIRED
  • HIGH
  • LOW
  • NONE

CWE-601 - Open Redirect

An open redirect attack employs a URL parameter, HTML refresh tags, or a DOM based location change to exploit the trust of a vulnerable domain to direct the users to a malicious website. The attack could lead to higher severity vulnerabilities such as unauthorized access control, account takeover, XSS, and more.

References

Advisory Timeline

  • Published