Summary
When sending multiple HTTP requests in one TCP packet, twisted.web will process the requests asynchronously without guaranteeing the response order.
Details
There's an example faulty program:
from twisted.internet import reactor, endpoints
from twisted.web import server
from twisted.web.proxy import ReverseProxyResource
from twisted.web.resource import Resource
class Second(Resource):
isLeaf = True
def render_GET(self, request):
return b'SECOND\n'
class First(Resource):
isLeaf = True
def render_GET(self, request):
def send_response():
request.write(b'FIRST DELAYED\n')
request.finish()
reactor.callLater(0.5, send_response)
return server.NOT_DONE_YET
root = Resource()
root.putChild(b'second', Second())
root.putChild(b'first', First())
endpoint = endpoints.TCP4ServerEndpoint(reactor, 8080)
endpoint.listen(server.Site(root))
reactor.run()When two requests for /first and /second are sent in the same order, the second request will be responded to first.
echo -en "GET /first HTTP/1.1\r\nHost: a\r\n\r\nGET /second HTTP/1.1\r\nHost: a\r\n\r\n" | nc localhost 8080
Impact
If one of the endpoints is controlled by an attacker, the attacker can delay the response on purpose to manipulate the response of the second request when a victim launched two requests using HTTP pipeline.
Summary
When sending multiple HTTP requests in one TCP packet, twisted.web will process the requests asynchronously without guaranteeing the response order.
Details
There's an example faulty program:
When two requests for
/firstand/secondare sent in the same order, the second request will be responded to first.Impact
If one of the endpoints is controlled by an attacker, the attacker can delay the response on purpose to manipulate the response of the second request when a victim launched two requests using HTTP pipeline.