Fix Shadow API Exposure in Pyramid
Shadow APIs in Pyramid are a classic case of 'out of sight, out of patch.' Developers frequently abuse 'config.scan()' to auto-register views, inadvertently exposing internal metrics, debug tools, or legacy endpoints that bypass standard authentication middleware. This creates an unmonitored attack surface where an attacker can discover undocumented routes via brute-force or side-channel leaks.
The Vulnerable Pattern
from pyramid.view import view_config from pyramid.config import Configuratorviews/hidden.py
@view_config(route_name=‘admin_debug’, renderer=‘json’) def admin_debug(request): # Shadow API: Exposed because config.scan() picks it up automatically return {‘system_env’: dict(request.registry.settings)}
init.py
def main(global_config, **settings): config = Configurator(settings=settings) config.add_route(‘admin_debug’, ’/_internal/debug’) # VULNERABILITY: Blindly scanning the entire package config.scan(’.’) return config.make_wsgi_app()
The Secure Implementation
To kill Shadow APIs, you must enforce visibility and authorization. First, replace broad 'config.scan()' calls with targeted scanning or explicit 'config.add_view' registrations. Second, implement a 'RootFactory' with Access Control Lists (ACLs) to ensure that even if a route is discovered, it requires a specific principal (e.g., group:admin). Third, use 'config.include' with a 'route_prefix' for sensitive modules; this centralizes management and allows you to apply global security predicates to all internal endpoints in one block.
from pyramid.view import view_config from pyramid.config import Configurator from pyramid.security import Allow, Authenticatedclass RootFactory(object): acl = [(Allow, ‘group:admin’, ‘internal_access’)]
def main(global_config, **settings): config = Configurator(settings=settings, root_factory=RootFactory) # 1. Explicit Routing over blind scanning config.add_route(‘api_v1’, ‘/api/v1/data’)
# 2. Strict scan exclusion for internal modules config.scan(ignore='myapp.views.internal') # 3. Mount internal tools on a separate, protected include config.include('.internal_routes', route_prefix='/_mgmt') return config.make_wsgi_app()internal_routes.py
def includeme(config): config.add_route(‘debug_stats’, ‘/stats’) config.add_view(debug_stats_view, route_name=‘debug_stats’, permission=‘internal_access’)
Your Pyramid API
might be exposed to Shadow API Exposure
74% of Pyramid apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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