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Credit:
The information has been provided by iDefense Labs.
The original article can be found at: http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=636
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Vulnerable Systems:
* netOctopus version 5.1.2 build 1011 with nantsys.sys driver version 5.0.0.115
The netOctopus Agent software is supposed to be installed on all client machines. It includes a driver, nantsys.sys, that is loaded at system boot time. This driver exposes a device interface, \\.\NantSys, that is writable by all users.
This driver includes functionality for reading and writing arbitrary CPU Model Specific Registers (MSRs). Changing MSR values allows tuning of various low level CPU operations. By modifying SYSENTER_EIP_MSR, is is possible to execute arbitrary attacker supplied code in kernel context by executing a sysenter instruction.
Analysis:
Exploitation of this vulnerability results in the execution of arbitrary code in kernel context. Unsuccessful attempts may result in a system crash. However, due to the nature of the vulnerability exploitation is extremely reliable.
Workaround:
Remove write permissions for the Everyone group for the \\.\NantSys device. This can be accomplished by using a tool like WinObj. This will prevent regular users from writing to the device.
Vendor response:
To address this vulnerability, Motorola Inc. has made a script available to remove the affected driver from the system. For more information, consult their advisory at the following URL.
http://www.netopia.com/support/software/technotes/netoctopus/Removing_the_nantsys_Driver.pdf
http://www.netopia.com/support/software/technotes/netoctopus/removeNantsys.vbs
CVE Information:
CVE-2007-5761
Disclosure Timeline:
09/07/2007 - Initial vendor notification
09/07/2007 - Initial vendor response
01/07/2008 - Coordinated public disclosure
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