Instructions showing wannabe Mac-hackers a way to remotely take control over OS X systems through an unpatched security hole have been posted online. The researcher who published the blueprints said he did so to nudge Apple into fixing the problem, which the company has known about for more than six months. But Security Fix has found that half a year is about the average time it takes Cupertino to plug these types of holes. On Tuesday, renowned Apple researcher Landon Fuller published a proof-of-concept exploit for a particularly dangerous bug in Java that Sun Microsystems fixed in a patch released Dec. 3, 2008. However, Apple — which ships its own version of Sun’s Java with OS X — has yet to push out an update to fix that particular flaw. “Unfortunately, it seems that many Mac OS X security issues are ignored if the severity of the issue is not