Experts reported drop-dead simple exploit that completely bypassed an OS X security feature known as Gatekeeper. Apple shipped a fix, but now the security researcher who discovered the original vulnerability said he found an equally obvious work-around.

Patrick Wardle said the security fix consisted of blacklisting a small number of known files he privately reported to Apple that could be repackaged to install malicious software on Macs, even when Gatekeeper is set to its most restrictive setting. Wardle was able to revive his attack with little effort by finding a new Apple trusted file that hadn't been blocked by the Apple update.