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Improper Restriction of XML External Entity Reference

CVE-2023-22832

Severity High
Score 7.5/10

Summary

The "ExtractCCDAAttributes" Processor in Apache NiFi versions 1.2.0 through 1.19.1 does not restrict XML External Entity references. Flow configurations that include the "ExtractCCDAAttributes" Processor are vulnerable to malicious XML documents that contain Document Type Declarations with XML External Entity references. The resolution disables Document Type Declarations and disallows XML External Entity resolution in the "ExtractCCDAAttributes" Processor.

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

CWE-611 - Improper Restriction of XML External Entity Reference

Listed 4th in the 'OWASP Top Ten', XML External Entities (XXE) vulnerability allows attackers to provide an XML input that contains an external entity. When the XML is parsed, it can cause data extraction and manipulation, execution of commands, denial-of-service attacks, and server-side request forgery.

Advisory Timeline

  • Published