Security vendor F-Secure issued a patch Thursday to <A HREF="http://news.zdnet.com/2100-1009_22-6028641.html?tag=nl.e589">deal with critical flaws</A> in a number of its antivirus and Internet security products. Flaws in the way F-Secure software handles ZIP and RAR data compression archives could allow an attacker to execute remote code on users' systems and also to bypass F-Secure's antivirus-scanning capabilities. Vulnerabilities were found in 19 versions of F-Secure's antivirus products for Microsoft Windows, as well as in its products for Linux.