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TITLE:
SpeedFan Speedfan.sys Privilege Escalation and Denial of Service

SECUNIA ADVISORY ID:
SA27312

VERIFY ADVISORY:
http://secunia.com/advisories/27312/

CRITICAL:
Less critical

IMPACT:
Security Bypass, Privilege escalation, DoS

WHERE:
Local system

SOFTWARE:
SpeedFan 4.x
http://secunia.com/product/9212/

DESCRIPTION:
Ruben Santamarta has reported some vulnerabilities and a weakness in
SpeedFan, which can be exploited by malicious, local users to bypass
certain security restrictions, cause a DoS (Denial of Service) or
gain escalated privileges.

1) Input validation errors within the 0x9C402438 and 0x9C40243C IOCTL
handlers of Speedfan.sys can be exploited to e.g. access the said
IOCTL handlers and overwrite arbitrary memory or load arbitrary
unsigned drivers on Windows Vista.

Successful exploitation allows execution of arbitrary code with
kernel privileges.

2) An error within the 0x9c402420 IOCTL handler can be exploited to
e.g. crash the system.

The vulnerabilities and weakness are reported in version 4.33. Other
versions may also be affected.

SOLUTION:
The vendor is reportedly working on a fix.

PROVIDED AND/OR DISCOVERED BY:
Ruben Santamarta

ORIGINAL ADVISORY:
http://www.reversemode.com/index.php?option=com_content&task=view&id=42&Itemid=1

http://www.bugtrack.almico.com/view.php?id=987

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