Florianbuetow Claude Code Privilege Escalation

Elevation of Privilege Analysis

Analyze source code for privilege escalation threats where attackers can gain unauthorized capabilities or access. Maps to STRIDE E -- violations of the Authorization security property.

Supported Flags

Read ../../shared/schemas/flags.md for the full flag specification. This skill supports all cross-cutting flags including --scope, --depth, --severity, --format, --fix, --quiet, and --explain.

Framework Context

Read ../../shared/frameworks/stride.md, specifically the E - Elevation of Privilege section, for the threat model backing this analysis. Key concerns: broken access control (IDOR), missing function-level access control, JWT manipulation, role confusion, privilege escalation.

Workflow

1. Determine Scope

Parse flags and resolve the target file list per the flags spec. Filter to files implementing authorization:

• Route handlers with role checks and permission guards
• Authorization middleware and policy enforcement points
• RBAC/ABAC implementations and permission models
• Admin endpoints and administrative interfaces
• User management (create, update roles, delete accounts)
• Object ownership checks and tenant isolation logic
• API controllers and GraphQL resolvers with access control
• Infrastructure-as-code defining IAM roles and security groups

2. Analyze for Privilege Escalation Threats

For each in-scope file, apply the Analysis Checklist below. At --depth standard, examine authorization logic in each file. At --depth deep, map the full authorization architecture: who can access what, where checks are enforced, where gaps exist between routes, and whether authorization is consistently applied at every layer.

3. Report Findings

Output findings per ../../shared/schemas/findings.md using the PRIV ID prefix (e.g., PRIV-001). Set references.stride to "E" on every finding.

Analysis Checklist

Work through these questions against the scoped code. Each "yes" may produce a finding.

1. Missing function-level access control -- Are admin or privileged endpoints accessible without role verification? Compare route definitions: if some routes check isAdmin, requireRole('admin'), or @permission_required, identify sibling routes that should but do not have equivalent guards. Map all endpoints and flag gaps in the authorization layer.
2. Insecure direct object references (IDOR) -- Do endpoints use user-supplied IDs to fetch resources without verifying ownership? Look for findById(req.params.id), getRecord(id) where the result is not checked against the requesting user's permissions or tenant. Test: can user A access user B's resources by changing the ID?
3. JWT claim manipulation -- Are JWT role or permission claims trusted without server-side verification? Check if role-based decisions use claims from the token payload without cross-referencing a server-side authority (database, LDAP). Look for jwt.decode without verify, or role checks solely from token claims.
4. Client-side authorization -- Are access control decisions made only in frontend code (React/Vue/Angular component guards, route guards) without corresponding server-side enforcement on the API endpoints they call? Search for role, isAdmin, canAccess in frontend code and verify equivalent checks exist server-side.
5. Mass assignment to role fields -- Can users set their own role, isAdmin, permissions, or group fields through API requests? Look for ORM .create(req.body) or .update(req.body) without excluding privilege-related fields. Check for attr_accessible, fillable, $guarded, or DTO validation that strips role fields.
6. Default admin accounts -- Are there hardcoded admin users created in seed scripts, migrations, or initialization code with well-known credentials? Look for role: 'admin' combined with password: in seed data. Check if these are gated behind environment checks (if NODE_ENV === 'development').
7. Horizontal privilege escalation -- Can users access other users' resources by manipulating IDs? Check if resource queries include ownership filters (WHERE user_id = ? or WHERE org_id = ?) or if they rely solely on the resource ID from the request. Multi-tenant applications must enforce tenant isolation on every query.
8. Trust boundary violations -- Are internal-only services or endpoints accessible from external networks? Look for admin APIs without network-level restrictions, internal microservice calls that accept external requests, or debug/management ports exposed without authentication.
9. Broken role hierarchy -- Is the role hierarchy enforced consistently? Check if editor can perform admin actions, or if role inheritance has gaps. Look for permission checks using string comparison (if role === 'admin') instead of hierarchical evaluation that accounts for role inheritance.
10. Missing deny-by-default -- Does the authorization system default to allow when no explicit rule matches? Check middleware ordering: is there a catch-all deny at the end, or do unmatched routes pass through without authorization? Look for next() called unconditionally in auth middleware.
11. Path parameter manipulation -- Can URL path parameters be manipulated to bypass route-level authorization? For example, accessing /api/admin/../user/settings to bypass admin-only middleware, or using URL encoding tricks to evade path-based access rules.
12. Scope/permission creep in tokens -- Are OAuth scopes or API key permissions overly broad? Check if tokens are issued with scope: *, full permissions, or if fine-grained scopes are available but not enforced. Look for scope validation at the endpoint level, not just at token issuance.

Pragmatism Notes

• Single-user applications or personal tools may not have authorization at all, and that is fine. Only flag missing authz when the application clearly has multiple user roles or multi-tenancy.
• IDOR findings require understanding the data model. Not every findById(req.params.id) is an IDOR -- some resources are intentionally public (e.g., blog posts, product listings). Focus on resources that contain user-private data.
• Client-side route guards are expected for UX (hiding admin buttons from regular users) but are not security controls. Only flag when the corresponding server-side check is missing.
• Mass assignment protections vary by framework. Before reporting, check if the framework has built-in protection (Rails strong params, Django ModelForm, NestJS DTOs with class-validator). Flag only when protection is absent or misconfigured.
• Role hierarchies are application-specific. A flat role model (admin / user) is not a finding. Flag only when the code shows evidence of an intended hierarchy that is inconsistently enforced.

What to Look For

Concrete code patterns and grep heuristics to surface privilege escalation risks:

• Unprotected admin routes: Routes containing /admin, /manage, /internal, /dashboard, /settings without auth middleware. Compare middleware chains between admin and public routes. Grep: (admin|manage|internal|dashboard) in route definitions.
• Direct ID lookups without ownership: Model.findById(req.params.id) or db.query("SELECT ... WHERE id = $1", [req.params.id]) without a user_id or org_id filter joined to the session user. Grep: findById\s*\(\s*req\.(params|query)|WHERE id\s*= without ownership clause.
• Role from client: req.body.role, request.data['is_admin'], params[:role] used in user creation or update without stripping. Also req.user.role derived solely from JWT without server-side lookup. Grep: req\.(body|query|params)\.(role|isAdmin|is_admin|permissions|group).
• Missing middleware on routes: Routes registered after auth middleware is applied vs. routes registered before (ordering bug). Check for app.use(authMiddleware) placement relative to route definitions. Grep: app\.(get|post|put|delete|use)\s*\( to map registration order.
• Wildcard permissions: permission: '*', role: 'superadmin' granted broadly, if (user.role) { allow } checking role existence rather than specific role value. Grep: permission.*\*|role.*super|if\s*\(\s*user\.(role|admin).
• Unsafe defaults: authorized: true as default, access: 'public' on sensitive resources, missing else deny in conditional authorization. Grep: authorized.*true|access.*public|default.*allow.
• Privilege fields in mass assignment: .create(req.body), Object.assign(user, req.body), **request.data without exclude_fields or pick for role/permission attributes. Grep: \.create\(\s*req\.body|Object\.assign\(.*req\.body|\.update\(\s*\{.*\.\.\.req.
• Inconsistent checks: Some endpoints for a resource check permissions while sibling endpoints for the same resource do not. Search for the resource name across handlers and compare auth patterns. Flag asymmetric coverage.

Output Format

Each finding must conform to ../../shared/schemas/findings.md.

id:          PRIV-<NNN>
severity:    critical | high | medium | low
confidence:  high | medium | low
location:    file, line, function, snippet
description: What the privilege escalation path is and how it can be exploited
impact:      What unauthorized capabilities an attacker gains
fix:         Concrete remediation with diff when possible
references:
  stride: "E"
  cwe:    CWE-269 (Improper Privilege Mgmt), CWE-639 (IDOR), or relevant CWE
metadata:
  tool:      privilege-escalation
  framework: stride
  category:  E

Severity Guidelines for Elevation of Privilege

Common CWE References

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