Important: #103306 - Frame GET parameter in tx_cms_showpic eID disabled¶
See forge#103306
Description¶
The show image controller (eID tx_cms_showpic) lacks a cryptographic
HMAC-signature on the frame HTTP query parameter (e.g.
/index.php?eID=tx_cms_showpic?file=3&...&frame=12345).
This allows adversaries to instruct the system to produce an arbitrary number of
thumbnail images on the server side.
To prevent uncontrolled resource consumption, the frame HTTP query parameter is now ignored, since it could not be used by core APIs.
The new feature flag
security.frontend.allowInsecureFrameOptionInShowImageController — which is
disabled per default — can be used to reactivate the previous behavior:
$GLOBALS['TYPO3_CONF_VARS']['SYS']['features']['security.frontend.allowInsecureFrameOptionInShowImageController'] = true;
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