Insecure service configuration - DocumentBuilderFactory

Description

DocumentBuilderFactory is insecurely configured, which makes it susceptible to XXE attacks.

Impact

• Read confidential information.
• Execute commands on the server.

Recommendation

Securely configure DocumentBuilderFactory.

Threat

Authorized attacker from the Internet.

Expected Remediation Time

⌚ minutes.

Score

Default score using CVSS 3.1. It may change depending on the context of the src.

Base

• Attack vector: N
• Attack complexity: H
• Privileges required: L
• User interaction: R
• Scope: U
• Confidentiality: L
• Integrity: L
• Availability: N

Temporal

• Exploit code madurity: P
• Remediation level: O
• Report confidence: R

Result

• Vector string: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:R
• Score:
  • Base: 3.7
  • Temporal: 3.2
• Severity:
  • Base: Low
  • Temporal: Low

Compliant code

There are additional settings in the DocumentBuilderFactory to securely configure the service

import com.sap.security.hardener.nw.facade.HardenerFacade;

public static DocumentBuilderFactory secureDocumentBuilderFactory(final DocumentBuilderFactory factory, final String    callerNamespace) throws ParserConfigurationException{
  DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
  //One possible method to secure the DocumentBuildeerFactory
  dbFactory = HardenerFacade.secureDocumentBuilderFactory(dbFactory);
  DocumentBuilder parser = dbf.newDocumentBuilder();
  parser.setErrorHandler(handler);
  return parser.parse(stream);
}

Non compliant code

The DocumentBuilderFactory does not have a secure configuration

public static DocumentBuilderFactory secureDocumentBuilderFactory(final DocumentBuilderFactory factory, final String    callerNamespace) throws ParserConfigurationException{
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  dbf.setNamespaceAware(true);
  DocumentBuilder parser = dbf.newDocumentBuilder();
  parser.setErrorHandler(handler);
  return parser.parse(stream);
}

Requirements

• 158.Use a secure programming language

Fixes

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