Speedfan Speedfan.sys denial of service

speedfan-speedfan-dos (37299)

Medium Risk

Description:

Microsoft Windows Vista is vulnerable to a denial of service, caused by an error in the IOCTL dispatch handler of the Speedfan.sys driver. By creating a specially-crafted file to overwrite an arbitrary MSR, a local attacker could exploit this vulnerability to crash the system.

*CVSS:

Base Score:	4.4
Access Vector:	Local
Access Complexity:	Medium
Authentication:	Single
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	Complete
Temporal Score:	4
Exploitability:	Proof-of-Concept
Remediation Level:	Unavailable
Report Confidence:	Confirmed

Consequences:

Denial of Service

Remedy:

No remedy available as of July 9, 2011.

References:

• Almico's Bug Tracker: Bug ID 0000987: Speedfan.sys IOCTL Dispatch Handlers privilege escalation.
• Reverse Mode News Archive, Friday, 19 October 2007: Another 3rd party flaw to step into Vista Kernel.
• SpeedFan Web page: SpeedFan .
• CVE-2007-5634: Speedfan.sys in Alfredo Milani Comparetti SpeedFan 4.33, when used on Microsoft Windows Vista x64, does not properly check a buffer during an IOCTL 0x9c402420 call, which allows local users to cause a denial of service (machine crash) and possibly gain privileges via unspecified vectors.
• SA27312: SpeedFan Speedfan.sys Privilege Escalation and Denial of Service

Platforms Affected:

• Alfredo Milani Comparetti SpeedFan 4.33
• Microsoft Windows Vista x64

Reported:

Oct 01, 2007

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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