"There are a number of significant vulnerabilities in technologies relating to the IE domain/zone security model, the DHTML object model, MIME-type determination, and ActiveX. It is possible to reduce exposure to these vulnerabilities by using a different Web browser, especially when browsing untrusted sites," US-CERT stated in a vulnerability note.
US-CERT is a non-profit partnership between the Department of Homeland Security (DHS) and the public and private sectors. It was established in September 2003 to improve computer security preparedness and response to cyber attacks in the U.S.
US-CERT researchers say the IE browser does not adequately validate the security context of a frame that has been redirected by a Web server. It opens the door for an attacker to exploit the flaw by executing script in different security domains.
To protect against the flaw, IE users are urged to disable Active scripting and ActiveX controls in the Internet Zone (or any zone used by an attacker). Other temporary workarounds include the application of the Outlook e-mail security update; the use of plain-text e-mails and the use of anti-virus software.
Surfers must also get into the habit of not clicking on unsolicited URLs from e-mail, instant messages, Web forums or internet relay chat (IRC) sessions.
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