Now that we have our virtual machines set up, let’s explore the vulnerability.

Reboot your Windows 7 host, and you will find your WinDBG come to life :) Now, on your debugging host, set WinDBG to connect via a COM port:Īnd on your Windows 7 host, enter the following at an administrative command prompt: bcdedit /debug on Next, on our debugging VM, we will want to perform a similar configuration, providing the same named pipe path, however this time we want to ensure that the “Connect to existing pipe/socket” option is deselected. It is important that the “Connect to existing pipe/socket” option is selected, which will allow the virtual serial port to establish a connection to the kernel debugger VM when required. Being a MacOS user, I am asked to provide a path for a named pipe, however this may differ from OS to OS: Due to this, we will revert to using a virtual serial port.įirst, on your Windows 7 virtual host settings, select “Ports” and make sure that a serial port is enabled.

If you remember, we previously used the NET option of the Windows 10 kernel debugger, however this is not supported in earlier versions. One thing worth walking through in this post however is how to set up a Windows 7 host for kernel debugging within VirtualBox. If you have not yet read through the first post in this series, I recommend that you pause and review it now, as it will provide details of how to set up your environment and connect the kernel debugger to your Windows 10 VM. Lab Setupįor this tutorial, we will set up our lab to consist of 3 virtual machines: To show some of the nuances of exploiting bugs on these operating systems, we will craft 2 exploits with the aim of achieving privilege escalation to the SYSTEM user. However, we know that Windows 7 is still a popular OS in use by many, and we know that thanks to backwards compatibility, Windows 10 has a weakness in 32-bit versions. With the NULL page being unavailable to user mode processes in Windows 8 and beyond, it may seem that this class of vulnerability has been mitigated. NULL pointer dereference bugs are becoming a difficult vulnerability to exploit on modern operating systems. This time we will be focusing on NULL pointer dereferences, and demonstrating how we can exploit this class of vulnerability on both Windows 7 圆4 and Windows 10 x32.

In this series of posts, we are exploring kernel driver exploitation via the HEVD driver provided by HackSys Team. « Back to home Exploiting Windows 10 Kernel Drivers - NULL Pointer Dereference

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