Microsoft warns on Internet Explorer security flaw

Microsoft Corp hs warned that a newly discovered bug in its Internet Explorer web browser makes PCs vulnerable to attack by hackers and urged customers to download a piece of security software to mitigate the risk of infection.

The security flaw affects hundreds of millions of Internet Explorer browser users. Microsoft said attackers can exploit the bug to infect the PC of someone who visits a malicious website and then take control of the victim’s computer.

The software maker advised customers on its website to install security software as an interim measure, buying it time to fix the bug and release a new, more secure version of Internet Explorer. The free security tool, which is known as Enhanced Mitigation Experience Toolkit, or EMET, is available through an advisory on Microsoft’s website:
blogs.technet.com/b/msrc/

The EMET software must be downloaded, installed and then manually configured to protect computers from the newly discovered threat. The company also advised customers to adjust several Windows security settings to thwart potential attackers, but cautioned that doing so might impact the PC’s usability.

Some security experts said it would be too cumbersome for many PC users to implement the measures suggested by Microsoft. Instead they advised Windows users to temporarily switch from Internet Explorer to rival browsers such as Google Inc’s Chrome, Mozilla’s Firefox or Opera Software ASA’s Opera. Microsoft officials declined to comment on the skepticism that those security experts expressed about the effectiveness of the EMET software.

Eric Romang, researcher in Luxembourg, discovered the flaw in Internet Explorer, when his PC was infected by a piece of malicious software known as Poison Ivy that hackers use to steal data or take remote control of PCs.