Advisory Title: Web Browsers vulnerable to the Extended HTML Form Attack Release Date: 06/02/2002 Effects: Internet Explorer 6 and older versions Opera 6.0 and older versions Severity: Allows stealing of cookies, penetration of internal networks and other evil stuff. Author: Obscure^ [ obscureat_private ] Vendor Status: Internet Explorer - Informed secureat_private and worked with them to release a patch. Should be out soon. Opera - Worked with the Opera team. A fix is due next release. Web: http://eyeonsecurity.net/papers/ - Extended HTML Form Attack Background. Many web browsers such as Internet Explorer allow forms to be submitted to non-HTTP services. Some non-HTTP services echo back the information sent, and the web browser renders the echo as an HTML page, regardless of the protocol behind the service. Problem. A malicious user can create a form which is submitted by the victim (automatically using Active Scripting or manually using Social Engineering). This form can cause a non-HTTP service to echo back JavaScript commands which in turn allow the malicious user to steal the cookie for that domain. There are more uses for this attack, other than just stealing cookies. Exploit Example. available at http://eyeonsecurity.net/advisories/showMyCookie.html Disclaimer. The information within this document may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties with regard to this information. In no event shall the author be liable for any consequences whatsoever arising out of or in connection with the use or spread of this information. Any use of this information lays within the user's responsibility. Feedback. Please send suggestions, updates, and comments to: Eye on Security mail : obscureat_private web : http://www.eyeonsecurity.net
This archive was generated by hypermail 2b30 : Wed Feb 06 2002 - 18:40:37 PST