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XXE Vulnerability Report Template

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XXE Vulnerability Report

Vulnerability Overview

XML External Entity (XXE) vulnerabilities occur when an application parses XML input from an untrusted source, allowing an attacker to include external entities that may disclose sensitive information, execute remote code, or cause a denial of service.

Vulnerability Details

  • Affected Component: [Specify the affected component/module/library where XXE vulnerability is present]
  • Vulnerable Parameter: [Identify the specific input parameter or data field vulnerable to XXE injection]
  • Attack Vector: [Describe how an attacker can exploit this vulnerability]
  • Impact: [Detail the potential impact of successful exploitation, such as data leakage, server-side request forgery (SSRF), or remote code execution (RCE)]

Steps to Reproduce

  1. Prepare Payload: Craft an XML payload containing an external entity declaration.
  2. Send Request: Submit the crafted XML payload to the vulnerable component.
  3. Observation: Observe the response from the application for any signs of XML entity expansion or unintended behavior.

Proof of Concept (PoC) Code

   <!-- Example of XXE Payload -->
<?xml version="1.0"?>
<!DOCTYPE data [
  <!ENTITY xxe SYSTEM "file:///etc/passwd">
]>
<data>&xxe;</data>

Recommendations

  • Input Validation: Implement strict input validation to sanitize and restrict user-supplied XML input.
  • Disable External Entity Resolution: Configure XML parsers to disable external entity resolution when parsing untrusted XML data.
  • Use Safe XML Parsers: Utilize secure XML parsing libraries that do not automatically resolve external entities by default.

Remediation Steps

  • Identify and patch the vulnerable component/module/library to prevent XXE vulnerabilities.
  • Perform comprehensive security testing, including code reviews and penetration testing, to ensure the absence of similar vulnerabilities.

Disclosure Timeline

  • [Date]: Vulnerability discovered.
  • [Date]: Initial communication with the vendor/developer.
  • [Date]: Vulnerability details shared with the vendor/developer.
  • [Date]: Vendor/developer acknowledgment of the vulnerability.
  • [Date]: Vendor/developer patch release or mitigation deployed.
  • [Date]: Public disclosure of the vulnerability.

References

Please replace placeholders such as [Specify], [Identify], [Describe], and [Date] with relevant information specific to the XXE vulnerability being reported.