[NEWS] Flash Player Local Shared Object Vulnerability (Patch)

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To: list@securiteam.com
Date: 18 Dec 2003 10:32:16 +0200

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  Flash Player Local Shared Object Vulnerability (Patch)
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SUMMARY

A recently discovered security flaw in the Internet Explorer and Opera
browsers may allow improper access to certain local files. A potential
exploit can then be created in association with the local Flash data file
to allow a malicious user to gain access to information stored on the
local machine.

DETAILS

Solution:
Macromedia has released an updated version of Macromedia Flash Player
(7,0,19,0) that can be downloaded from the Macromedia Player Download
Center.

This new version stores local data in a way that a malicious user cannot
access it from applications other than Flash Player. This ensures Flash
movies are able to work properly with data saved to the local file system,
but external applications, such as web browsers, are not.

Severity Rating:
Macromedia categorizes this issue as an important update and recommends
users update to the newest player.

Technical Details:
This release of Flash Player addresses the potential for exploits due to
the predictability of the location of data stored by the Flash movies.
While this is not in itself a directly exploitable vulnerability, an
exploit can be created in combination with a security flaw in the browser.
If the data stored by Flash Player on the local file system is a script,
then it may be possible for that script to be executed on the local
machine using a browser.

This update prevents data stored by Flash movies from being used
maliciously. However, at this time no updates to Internet Explorer and
Opera browsers addressing the vulnerabilities in those products
have been announced.

ADDITIONAL INFORMATION

The information has been provided by <mailto:secure@macromedia.com>
Macromedia Security Center.

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