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Insecure Library Loading
Not critical

Firefox Charset Inheritance Cross-Site Scripting Security Issue

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Release Date:  2007-12-04    Views:  16,130

Secunia Advisory SA27907

Where:

From remote

Impact:

Cross Site Scripting

Solution Status:

Unpatched

CVE Reference(s):

No CVE references.

Description


Paul Szabo has discovered a security issue in Firefox, which can be exploited by malicious people to conduct cross-site scripting attacks.

The security issue is caused due to embedded iframes inheriting the charset of parent frames when the charset is set manually. 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 via iframes in a malicious page.

Successful exploitation requires that the target user is tricked into changing the charset of the parent page e.g. to UTF-7.

The security issue is confirmed in Firefox 2.0.0.11. Other versions may also be affected.


Solution:
Do not change the character encoding manually. Do not browse untrusted sites.

Provided and/or discovered by:
Paul Szabo

Original Advisory:
http://lists.grok.org.uk/pipermail/full-disclosure/2007-December/058752.html

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Firefox Charset Inheritance Cross-Site Scripting Security Issue

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