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TITLE:
Mozilla Firefox Temporary File Download Manipulation Security Issue

SECUNIA ADVISORY ID:
SA36649

VERIFY ADVISORY:
http://secunia.com/advisories/36649/

DESCRIPTION:
Jeremy Brown has discovered a security issue in Mozilla Firefox,
which can be exploited by malicious, local users to manipulate
certain data.

The security issue is caused due to the browser using a fixed path
from the /tmp directory when a user opens a file downloaded for
opening from the "Downloads" window. This can be exploited to trick a
user into opening a file with potentially malicious content by placing
it in the /tmp directory before the download takes place. 

The security issue is confirmed in version 3.5.2 for Linux. Other
versions may also be affected.

SOLUTION:
Restrict local access to trusted users only.

Avoid manually opening temporary downloads via the "Downloads"
window.

PROVIDED AND/OR DISCOVERED BY:
Jeremy Brown

ORIGINAL ADVISORY:
http://jbrownsec.blogspot.com/2009/09/vamos-updates.html

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