Forum Thread: Internet Explorer Charset Inheritance Cross-Site Scripting Vulner...

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Internet Explorer Charset Inheritance Cross-Site Scripting Vulnerability

Secunia Internet Explorer Charset Inheritance Cross-Site Scripting Vulnerability
Secunia Official 22nd Aug, 2010 19:52
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Stefan Esser has discovered a vulnerability in Internet Explorer, which can be exploited by malicious people to conduct cross-site scripting attacks.

The vulnerability exists because pages that don't specify a charset inherit the charset of the parent page. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of certain sites that are included e.g. via iframes in a malicious page that uses UTF-7 as charset.

Successful exploitation requires that the user is tricked into visiting a malicious web site.

The vulnerability is confirmed in Internet Explorer 7 and 8 on a fully patched Windows XP. Other versions may also be affected.

palisade RE: Internet Explorer Charset Inheritance Cross-Site Scripting Vulnerability
Member 22nd Aug, 2010 19:52
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Last edited on 22nd Aug, 2010 20:19
I have verified this exploit still works on the latest IE8. I also tested Chrome and Firefox, they are not vulnerable. I am going to try downloading the preview for IE9 and test that as well, I'll keep everyone here posted.

After that I am going to contact MS and see what their thoughts on this are.

Update: The IE9 preview is not vulnerable to this exploit. However, the preview is far from ready to be used as a replacement web browser for IE8 and it is not officially out yet. This vulnerability is not actually closed until MS fully releases IE9 to the public after the beta this September. Since they have solved this in IE9 there's no need for me to contact MS regarding this issue at this time.
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firebreathingmonkey RE: Internet Explorer Charset Inheritance Cross-Site Scripting Vulnerability
Member 14th Sep, 2010 09:47
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IE9 might fix the problem but this version of IE only runs on Windows Vista and Windows 7 (as far as I am aware) so users of Windows XP will still need the IE7 or IE8 patch introducing.
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PetrolDave RE: Internet Explorer Charset Inheritance Cross-Site Scripting Vulnerability
Member 9th Feb, 2011 11:28
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Last edited on 9th Feb, 2011 11:29
According to Wikipedia http://en.wikipedia.org/wiki/Usage_share_of_operat... 44% of all Windows installations are still using XP, so a patch of IE8 is essential - unless M$ are happy to leave this vulnerability open to nearly half of Windows users?
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sp80 RE: Internet Explorer Charset Inheritance Cross-Site Scripting Vulnerability
Member 21st Aug, 2013 12:01
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Last edited on 21st Aug, 2013 12:01
Is this vulnerability still existing for a fully IE8 + WinXP configuration? What is Microsoft answer to this problem?
Thank you.

--
Regards
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This user no longer exists RE: Internet Explorer Charset Inheritance Cross-Site Scripting Vulnerability
Secunia Official 22nd Aug, 2013 09:25