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TITLE:
Firefox Greasemonkey Extension Disclosure of Sensitive Information

SECUNIA ADVISORY ID:
SA16128

VERIFY ADVISORY:
http://secunia.com/advisories/16128/

CRITICAL:
Moderately critical

IMPACT:
Exposure of system information, Exposure of sensitive information

WHERE:
>From remote

SOFTWARE:
Greasemonkey 0.x (extension for Firefox)
http://secunia.com/product/5420/

DESCRIPTION:
Mark Pilgrim has reported a vulnerability in the Greasemonkey
extension for Firefox, which can be exploited by malicious people to
disclose various information.

The vulnerability is caused due to certain functions being insecurely
exposed and can be exploited by a malicious web site via the
"GM_xmlhttpRequest()" function to disclose the contents of arbitrary
local files and list the contents of arbitrary local directories.

Successful exploitation requires that a Greasemonkey script is
configured to run on the malicious web site.

The vulnerability has been reported in versions prior to 0.3.5.

SOLUTION:
The vulnerability has been fixed in version 0.3.5 by reducing the
functionality.

PROVIDED AND/OR DISCOVERED BY:
Mark Pilgrim

ORIGINAL ADVISORY:
http://greaseblog.blogspot.com/2005/07/mandatory-greasemonkey-update.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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