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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
56 lines
1.7 KiB
Markdown
56 lines
1.7 KiB
Markdown
# API Reference: Testing for Email Header Injection
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## CRLF Encoding Variants
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| Encoding | Representation | Description |
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|----------|---------------|-------------|
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| `%0A` | LF | URL-encoded line feed |
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| `%0D%0A` | CRLF | URL-encoded carriage return + line feed |
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| `%0D` | CR | URL-encoded carriage return |
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| `%250A` | Double-encoded LF | Bypasses single decode |
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| `\n` | Raw LF | Direct newline character |
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## Injectable Headers
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| Header | Impact | Severity |
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|--------|--------|----------|
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| Cc: | Send copy to attacker | High |
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| Bcc: | Hidden copy to attacker | High |
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| From: | Email spoofing | Medium |
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| Reply-To: | Phishing redirect | Medium |
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| Subject: | Subject override | Low |
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| Content-Type: | Body injection | High |
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| To: | Additional recipients | High |
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## Common Injection Points
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| Endpoint | Field | Risk |
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|----------|-------|------|
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| /contact | email, name, subject | Header injection |
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| /share | to, from | Recipient injection |
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| /invite | email | Mass invitation abuse |
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| /forgot-password | email | CC token to attacker |
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| /api/send-email | to, subject, body | Full control |
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## Attack Scenarios
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| Scenario | Technique |
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|----------|-----------|
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| Spam relay | Inject BCC with mass recipients |
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| Phishing | Override From/Reply-To |
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| Password reset hijack | CC reset token email |
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| Content override | MIME boundary injection |
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## Python Libraries
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| Library | Version | Purpose |
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|---------|---------|---------|
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| `requests` | >=2.28 | HTTP form submission |
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| `json` | stdlib | Report generation |
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## References
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- OWASP Email Injection: https://owasp.org/www-community/attacks/Email_Injection
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- swaks SMTP testing: https://www.jetmore.org/john/code/swaks/
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- mailhog: https://github.com/mailhog/MailHog
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