We browsers vulnerability

[Paul Wilders]

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^

Vendor Status:
Internet Explorer - Informed secure@microsoft.com 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.

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regards.

paul

[spy1]

Paul - Do you remember what that link was where you could d/l the most up-to-date beta of Opera? I can't find it. Pete

[Paul Wilders]

Paul - Do you remember what that link was where you could d/l the most up-to-date beta of Opera? I can't find it. Pete

You'll find it over here:

http://www.opera.com/download/

FYI: the pulled a version back; available now is version 6.0.1010

regards.

paul

[Krusty]

Howdy Paul

Opera is working extremely fine for me together win 98, and with configured virtual memory. Opera needs some extra RAM for cache files.
And with Cookie Muncher it´s security is even better. Java is disabled too. Still never knows.....

-Ari