Apple has taken another swing at fixing a troublesome spate of QuickTime vulnerabilities. The company released an update for the Windows version of QuickTime media player on Wednesday afternoon to patch what Apple calls a "command injection issue" in the way the media player handles URLs. The flaw, which affects Windows XP and Windows Vista, was first disclosed in September of 2006 by Petko D. Petkov, a penetration tester. Petkov noted in a blog post this September that he reported two QuickTime bugs in the early fall of 2006. Only one, however, was patched. To bring attention to the year-old vulnerability, Petkov posted several proof-of-concept exploits on his blog last month. The issue does not affect computers running Mac OS X, according to Apple.