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Permissive Cross-domain Policy with Untrusted Domains

CVE-2021-34435

High
8.8/10

Summary

In Eclipse Theia 0.3.9 before 1.8.1 and 1.9.x before 1.9.0-next.2d422afd , the "mini-browser" extension allows a user to preview HTML files in an iframe inside the IDE. But with the way it is made it is possible for a previewed HTML file to trigger an RCE. This exploit only happens if a user previews a malicious file.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • REQUIRED
  • NONE
  • HIGH
  • HIGH

CWE-942 - Permissive Cross-domain Policy with Untrusted Domains

The software uses a cross-domain policy file that includes domains that should not be trusted.

References

Advisory Timeline

  • Published