Adware purveyor used security flaws to install a toolbar on Internet Explorer

Pop-up toolbar spreads via IE flaws - News - ZDNet:
"An adware purveyor has apparently used two previously unknown security flaws in Microsoft's Internet Explorer browser to install a toolbar on victims' computers that triggers pop-up ads, researchers said this week.

One flaw lets an attacker run a program on a victim's machine, while the other enables malicious code to 'cross zones,' or run with privileges higher than normal. Together, the two issues allow for the creation of a Web site that, when visited by victims, can upload and install programs to the victim's computer, according to two analyses of the security holes.… "

http://zdnet.com.com/2100-1105_2-5229707.html