Fix Unrestricted Resource Consumption in TurboGears
Unrestricted resource consumption in TurboGears often manifests via unbounded file uploads or memory-intensive operations. An attacker can trigger Out-of-Memory (OOM) errors or disk exhaustion by flooding endpoints with massive payloads. To mitigate, we must enforce strict limits at the WSGI middleware level and within the controller logic.
The Vulnerable Pattern
from tg import expose, request
class RootController(BaseController): @expose() def upload(self, myfile): # VULNERABLE: Reads entire file into memory without size checks or validation data = myfile.file.read() with open(‘/tmp/uploaded_file’, ‘wb’) as f: f.write(data) return ‘File uploaded’
The Secure Implementation
The fix involves a multi-layered defense. First, we validate the 'Content-Length' header to reject oversized requests immediately. Second, because headers can be spoofed, we implement a streaming read loop that tracks the actual bytes written to disk, aborting with a 413 error if the threshold is exceeded. This prevents OOM (Out of Memory) kills and disk exhaustion. For production environments, it is also recommended to set 'client_max_body_size' in Nginx or 'LimitRequestBody' in Apache to stop the request before it reaches the TurboGears application.
from tg import expose, request, abort
MAX_UPLOAD_SIZE = 5 * 1024 * 1024 # 5MB Limit
class RootController(BaseController):
@expose()
def upload(self, myfile):
# Check Content-Length header first
content_length = int(request.header_map.get(‘Content-Length’, 0))
if content_length > MAX_UPLOAD_SIZE:
abort(413, ‘Payload Too Large’)
# Secure: Stream processing with chunked size enforcement
size = 0
with open('/tmp/secure_upload', 'wb') as f:
while True:
chunk = myfile.file.read(8192)
if not chunk:
break
size += len(chunk)
if size > MAX_UPLOAD_SIZE:
abort(413, 'Payload Too Large')
f.write(chunk)
return 'Upload successful'</code></pre>
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