Date: 12 June 2007
References: ESB-2007.0550 ESB-2007.1030
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AUSCERT External Security Bulletin Redistribution
ESB-2007.0404 -- [Win][UNIX/Linux]
12 June 2007
AusCERT Security Bulletin Summary
Product: Firefox 18.104.22.168 and prior
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact: Cross-site Scripting
Access Privileged Data
CVE Names: CVE-2007-3089
Original Bulletin: http://www.kb.cert.org/vuls/id/143297
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US-CERT Vulnerability Note VU#143297
Mozilla Firefox allows cross-domain access to an iframe. This
vulnerability could allow an attacker to interact with a web site in
a different domain. The attacker could read content and cookies,
capture keystrokes, and modify content.
An iframe is an HTML element which allows an HTML document to be
embedded inside a master HTML document.
The Mozilla same origin policy says:
The same origin policy prevents document or script loaded from
one origin from getting or setting properties of a document
from a different origin. The policy dates from Netscape Navigator 2.0.
Mozilla considers two pages to have the same origin if the
protocol, port (if given), and host are the same for both pages.
Firefox does not properly enforce the same origin policy to web pages
that use IFrames.
From Mozilla Bugzilla Bug ID 382686:
The problem you fixed there is that document.write() could be
used to overwrite frames that originate from Internet-based
SRC= pointing to non-same-domain site. This is fixed and throws
a security exception.
Unfortunately, the check implemented means that about:blank
frames can be overwritten freely; and unfortunately, *all*
frames, even with Internet SRC= specified, will be vulnerable
to a race condition while the document loads.
Note that some websites that allow users to supply content may allow
iframes to be included.
An attacker may be able to obtain sensitive data from a user, modify
the appearance of a webpage or track keystrokes. Depending on the
nature of the web site the user was visiting, this data may include
passwords, credit card numbers, and any arbitrary information provided
by the user.
We are currently unaware of a practical solution to this problem.
Workarounds for users
* Use the NoScript Firefox Add-on to whitelist what sites can run
* Type in URLs directly in the web browser's address bar, or use
bookmarks to navigate to websites
* See the Cross-Site Scripting Vulnerabilities document for general
Workarounds for administrators
* Do not allow users to submit content to a shared resource that
includes iframes. A shared resource may include the comments
section of a blog or a web forum.
* Monitor the content submitted by third parties for malicious
Vendor Status Date Updated
Mozilla Vulnerable 8-Jun-2007
This vulnerability was reported by Michal Zalewski on the
Full-Disclosure mailing list.
This document was written by Ryan Giobbi.
Date Public 06/04/2007
Date First Published 06/08/2007 01:28:14 PM
Date Last Updated 06/11/2007
Document Revision 22
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