The command prompt has been disabled by your administrator?

nospam@example.com (Tariq) — Thu, 05 Feb 2009 08:10:00 -0700

I came across an old enough post on Didier's blog about Group policies that have disabled cmd.exe from running. Didier mentions a few ways to get cmd.exe to run. The suggestion I like the most is to find the DisableCMD string in cmd.exe and change it to DisableAMD using a hex editor. Thankfully there is a tool which will allow us to patch cmd.exe in one tiny line.
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Adding a malicious system call to the Linux kernel

nospam@example.com (Tariq) — Thu, 11 Dec 2008 08:21:00 -0700

Today I am adding a malicious system call to the Linux kernel which will allow the caller to do something they cannot normally do in user mode. When attacking a Linux box our goal is usually to become root; as root we can do anything we like, so the system call I will add to the Linux kernel gives the caller real and effective user ids of zero.

There are relatively few tutorials out there on how to do this, unfortunately there a little differences between versions of Linux that can easily stump beginners, so this tutorial tries to give you an environment which you can easily replicate using a virtual machine and go through the tutorial.

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Gl.ib.ly - Security

The command prompt has been disabled by your administrator?

Adding a malicious system call to the Linux kernel