Fix Unrestricted Resource Consumption in Pyramid
Unrestricted resource consumption in Pyramid typically manifests as DoS vulnerabilities via massive file uploads or uncontrolled memory allocation. If you aren't capping the request body size at the WebOb layer, an attacker can flood your worker processes with multi-gigabyte payloads, exhausting RAM or disk space and killing the service.
The Vulnerable Pattern
from pyramid.view import view_config
@view_config(route_name=‘upload_raw’, renderer=‘json’) def upload_raw(request): # VULNERABLE: Directly reading the entire stream into memory # No check on Content-Length or total body size file_data = request.POST[‘file’].file.read() return {‘size’: len(file_data)}
The Secure Implementation
To mitigate resource exhaustion, you must implement multi-layered defense. First, configure the 'webob.max_body_size' setting in your Pyramid production .ini file; this provides a global cap. Second, in your views, explicitly validate 'request.content_length' before touching the data stream. Finally, never use a naked '.read()' call which buffers the entire payload in memory; use a loop to read fixed-size chunks and track the total bytes processed to prevent 'slowloris' style memory creep or disk filling.
from pyramid.view import view_config
from pyramid.httpexceptions import HTTPRequestEntityTooLarge
Recommended: Set ‘webob.max_body_size’ in your .ini configuration
webob.max_body_size = 10485760 (10MB)
@view_config(route_name=‘upload_secure’, renderer=‘json’)
def upload_secure(request):
MAX_ALLOWED = 10 * 1024 * 1024 # 10MB limit
if request.content_length and request.content_length > MAX_ALLOWED:
raise HTTPRequestEntityTooLarge("Payload exceeds limit")
input_file = request.POST['file'].file
total_read = 0
# SECURE: Stream processing with chunked reads and hard limit
while True:
chunk = input_file.read(8192)
if not chunk:
break
total_read += len(chunk)
if total_read > MAX_ALLOWED:
raise HTTPRequestEntityTooLarge("Stream exceeded limit")
# process_chunk(chunk)
return {'status': 'success'}</code></pre>
Your Pyramid API
might be exposed to Unrestricted Resource Consumption
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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