Microsoft is warning that a previously patched flaw in the way Windows looks up other computers on the Internet has resurfaced and could be used to direct people to malicious Web sites, reports InfoWorld.
The flaw, patched in 1999, affects all versions of Windows and becomes an issue primarily for corporate users outside the United States.
vnunet.com suggests users disable "automatically detect settings" in Internet Explorer.
Meanwhile, Symantec is warning that attackers are targeting an unpatched vulnerability in Apple QuickTime software. It affects both Windows and Mac OS users, according to PCWorld.com. It says the bug can be exploited through Internet Explorer, Firefox, Opera and Safari.