TYPO3 vulnerable to an Uncontrolled Resource Consumption in the ShowImageController

Problem The ShowImageController eID txcmsshowpic lacks a cryptographic HMAC-signature on the frame HTTP query parameter e.g. /index.php?eID=txcmsshowpic?file=3&...&frame=12345. This allows adversaries to instruct the system to produce an arbitrary number of thumbnail images on the server side...