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Vulnerability Note VU#146896Gear Software CD DVD Filter driver privilege escalation vulnerabilityOverviewThe Gear Software CD DVD Filter driver contains a privilege escalation vulnerability, which can allow an attacker to gain SYSTEM privileges.I. DescriptionGear Software provides a driver called CD DVD Filter, which is provided by GEARAspiWDM.sys. This driver is used by multiple CD/DVD recording applications. The Gear Software CD DVD Filter driver allows unlimited calls to IoAttachDevice from a user-space application. By making multiple calls to IoAttachDevice, an attacker may be able to exploit an integer overflow in the Microsoft Windows kernel to execute code with SYSTEM privileges.II. ImpactAn attacker may be able to execute code with SYSTEM privileges.III. SolutionApply an updateThis issue is addressed in GEAR driver version 4.001.7, which provides GEARAspiWDM.sys version 2.0.7.5. This version of the CD DVD Filter driver limits the number of IoAttachDevice calls that can be made. Please check with your software vendor for updates that contains this fixed driver. If no update is available, the stand-alone driver from GEAR may be installed.
References
Thanks to Ruben Santamarta of Wintercore for reporting this vulnerability by way of the Microsoft Security Response Center. This document was written by Will Dormann.
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