A stack-based buffer overflow occurs when processing a long rtsp:// URL within a QTL file, which is an XML document laid out like the following, according to the published proof-of-concept:
src="rtsp://A:[258 or more characters]" />
This malicious QTL file may be hosted on a web site, allowing for exploitation across the internet. Other attack vectors may be possible to reach the same vulnerable code in QuickTime which may require less user interaction than this published proof-of-concept.
QuickTime 7.1.3 and earlier
BeyondTrust Prevention and Detection:
A vendor-supplied patch is available and is the best form of mitigation for this vulnerability.
Previous Mitigation Information
To block the published proof-of-concept using other mitigation, users are suggested to disassociate QTL files from QuickTime. This can be accomplished via the registry, by editing the (default) key in HKEY_CLASSES_ROOT.qtl. Simply adding a ".bak" will disable QuickTime from opening QTL files. This mitigation will only protect from the QTL-file vector, which is the only published attack vector.
NOTE: Although some sources have suggested disabling RTSP within QuickTime, this does not effectively stop the proof-of-concept exploit.
Links:Original Disclosure (MoAB-01-01-2007)
PoC Code Disclosure - Mac (Non-Malicious Exploit)
PoC Code Disclosure - Windows (BindShell TCP/4444)