Chinese security researcher Liu Die Yu discovered and released details of new Microsoft Explorer 6 flaws on the Bugtraq mailing list. If the exploit is used on a computer, a cracker can download and execute a malicious file on a user's system.

Security professionals say that the only present fix is to disable MS Explorer's active scripting so that the feature can't be used to attack the machine.

Liu Die Yu also says that other minor flaws found can lead to a larger crack of a system.

Presently Microsoft is working on a fix and will make patches available soon.