Mozilla Thunderbird Validation Error in IFRAME SRC Tag Lets Remote Users Execute Arbitrary Javascript
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SecurityTracker Alert ID: 1015665
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SecurityTracker URL: http://securitytracker.com/id?1015665
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Feb 22 2006
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Impact: Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Version(s): 1.0.7 and prior versions
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Description: A vulnerability was reported in Mozilla Thunderbird. A remote user can cause arbitrary scripting code to be executed on the target user's system.
The software does not properly filter javascript from HTML tags. A remote user can send HTML-based e-mail with arbitrary javascript
in the SRC attribute of the IFRAME tag. When the target user edits the message (when replying to the message, for example), the
javascript will be executed, regardless of the javascript settings in the preferences.
A demonstration exploit is provided:
<html>
<body>
<iframe
src="javascript:alert('Found by www.sysdream.com !')"></iframe>
</body>
</html>
nono2357 at sysdream dot com discovered this
vulnerability.
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Impact: A remote user can cause arbitrary javascript to be executed on the target user's system.
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Solution: The vendor has issued a fixed version (1.5), available at:
http://www.mozilla.com/thunderbird/
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Vendor URL: www.mozilla.com/thunderbird/ (Links to External Site)
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Cause: Input validation error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Reported By: Renaud Lifchitz <r.lifchitz@sysdream.com>
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Message History:
None.
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Source Message Contents
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Date: Wed, 22 Feb 2006 15:42:19 +0100
From: Renaud Lifchitz <r.lifchitz@sysdream.com>
Subject: Mozilla Thunderbird : Remote Code Execution & Denial of Service
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Mozilla Thunderbird : Remote Code Execution & Denial of Service
//----- Advisory
Program : Mozilla Thunderbird
Homepage : http://www.mozilla.com/thunderbird/
Tested version : <= 1.0.7
Found by : nono2357 at sysdream dot com
This advisory : nono2357 at sysdream dot com
Discovery date : 2006/01/28
//----- Application description
Full-Featured Email
Simple to use, powerful, and customizable, Thunderbird is a full-featured
email application. Thunderbird supports IMAP and POP mail protocols, as well
as HTML mail formatting. Easily import your existing email accounts and
messages. Built-in RSS capabilities, powerful quick search, spell check
as you
type, global inbox, deleting attachments and advanced message filtering
round
out Thunderbird's modern feature set.
//----- Description of vulnerability
Thunderbird's WYSIWYG rendering engine insufficiently filters javascript
scripts. It is possible to write javascript in the SRC attribute of the
IFRAME
tag. This leads to execution when the email is edited (for instance when
replying to the email), even if javascript is disabled in the preferences.
//----- Proof Of Concept
* Javascript execution :
<html>
<body>
<iframe src="javascript:alert('Found by www.sysdream.com !')"></iframe>
</body>
</html>
* Denial of service (application crash) :
<html>
<body>
<iframe src="javascript:parent.document.write('Found by www.sysdream.com
!')"></iframe>
</body>
</html>
//----- Solution
Upgrade to version 1.5.
Download page : http://www.mozilla.com/thunderbird/all.html
Direct link :
http://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/1.5/
//----- Impact
Successful exploitation may lead to information disclosure (application
version, platform, user emails, user preferences, ...) or could crash the
application.
//----- Credits
http://www.sysdream.com
nono2357 at sysdream dot com
//----- Greetings
crashfr & the hackademy ...
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