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TITLE:
GreaseKit / Creammonkey GM API Vulnerability

SECUNIA ADVISORY ID:
SA28241

VERIFY ADVISORY:
http://secunia.com/advisories/28241/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
GreaseKit / Creammonkey 1.x
http://secunia.com/product/17044/

DESCRIPTION:
A vulnerability was reported in GreaseKit / Creammonkey, which can be
exploited by malicious people to bypass certain security
restrictions.

The vulnerability is caused due to the insufficient protection of the
functions GM_addSytle, GM_log, GM_openInTab, GM_setValue, GM_getValue,
and GM_xmlhttpRequest for userscript. This can be exploited to e.g.
disclose and manipulate settings or send HTTP requests, if a user
visits a malicious website.

Successful exploitation requires that "userscript" is enabled for the
malicious website.

SOLUTION:
Update to version 1.4.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
http://8-p.info/greasekit/vuln/20071226-en.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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