
diff -r b183036ba675 -r 6d552ef3b435 handouts/ho03.tex
--- a/handouts/ho03.tex	Wed Oct 07 10:14:04 2015 +0100
+++ b/handouts/ho03.tex	Wed Oct 07 18:03:32 2015 +0100
@@ -412,6 +412,14 @@
 ``higher-education'' in the architecture of the target system.
 But it is actually relatively simple: First there are many
 such strings ready-made---just a quick Google query away.
+A nice selection of ready-made shell-codes can be found 
+for example at
+
+\begin{center}
+\url{http://shellblade.net/shellcode.html}
+\end{center}
+
+
 Second, tools like the debugger can help us again. We can just
 write the code we want in C, for example this would be the
 program for starting a shell:
@@ -450,7 +458,8 @@
 will be send to the target computer. This of course requires
 that the buffer we are trying to attack can at least contain
 the shellcode we want to run. But as you can see this is only
-47 bytes, which is a very low bar to jump over. More
+47 bytes, which is a very low bar to jump over. Actually there
+are optimised versions which only need 24 bytes. More
 formidable is the choice of finding the right address to jump
 to. The string is typically of the form
 




