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Valentin Brandl 2022-10-21 15:20:54 +02:00
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2 changed files with 42 additions and 27 deletions
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8
bibliography.bib
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@ -51,6 +51,14 @@ year={2007}
urldate = {2022-09-28},
}
@unpublished{spg,
Author = {Skornia, Christoph},
Institution = {OTH Regensburg},
Howpublished = {University Lecture},
Year = {2021},
Title = {Secure Programming --- Input Validation},
}
@misc{directoryStructure,
title = {Classic SysAdmin: The Linux Filesystem Explained},
Institution = {The Linux Foundation},

37
bof.tex
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@ -120,23 +120,31 @@
\section{Stack Layout, Execution Flow}
\begin{frame}
\frametitle{Stack Layout}
\includegraphics[width=.30\textwidth]{stack.png}
\frametitle{Stack Layout}
\begin{figure}
\centering
\includegraphics[width=.25\textwidth]{stack.png}
\caption{Stack Layout~\cite{spg}}
\end{figure}
\end{frame}
\begin{frame}
\frametitle{Stack Layout}
\includegraphics[width=.60\textwidth]{stack_overflow.png}
\frametitle{Stack Layout}
\begin{figure}
\centering
\includegraphics[width=.60\textwidth]{stack_overflow.png}
\caption{Buffer Overflow~\cite{spg}}
\end{figure}
\end{frame}
\begin{frame}
\frametitle{Execution Flow}
\begin{itemize}
\frametitle{Execution Flow}
\begin{itemize}
\item Beim Aufruf einer Funktion, aktuelle Adresse auf Stack
\item \emph{\Ac{ip}} auf Adresse der aufgerufenen Funktion
\item Bei \mintinline{c}{return}, Stack Frame wiederherstellen, Adresse von Stack in \emph{\Ac{ip}}
\item Was wenn die Adresse auf dem Stack überschrieben wurde?
\end{itemize}
\end{itemize}
\end{frame}
\section{Exkurs: Shellcode}
@ -153,34 +161,33 @@
\item \url{https://www.exploit-db.com/shellcodes}
\end{itemize}
\end{itemize}
% \frametitle{Exkurs: Shellcode}
\end{frame}
\section{Exploitation}
\begin{frame}
\frametitle{Code Execution}
\begin{itemize}
\frametitle{Code Execution}
\begin{itemize}
\item Shellcode im Speicher plazieren
\item Buffer überschreiben
\item \emph{\Ac{ip}} überschreiben
\item \emph{\Ac{ip}} auf Shellcode zeigen lassen
\end{itemize}
\end{itemize}
\end{frame}
\section{Aktuelles Beispiel}
\begin{frame}
\frametitle{Beispiel in freier Wildbahn}
\begin{description}
\frametitle{Beispiel in freier Wildbahn}
\begin{description}
\item[\emph{Chromium}] Heap Buffer Overflown WebGPU: \emph{CVE-2022-1483}~\cite{CVE-2022-1483}
\item[\emph{Linux Kernel}] Heap Buffer Overflow durch Integer Overflow: \emph{CVE-2022-39842}~\cite{CVE-2022-39842}
\item[\emph{MPlayer}] Buffer Overflow beim lesen von AVI und MPEG Headern: \emph{CVE-2022-38866}~\cite{CVE-2022-38866}, \emph{CVE-2022-38864}~\cite{CVE-2022-38864}
\item[\emph{GNU Binutils}] Heap Buffer Overflow in \emph{strip}: \emph{CVE-2022-38533}~\cite{CVE-2022-38533}
\end{description}
\end{description}
\end{frame}
\section{Aktuelle Situation}
\begin{frame}
\frametitle{Migrationen}
\frametitle{Migrationen}
\begin{itemize}
\item \Ac{aslr}
\item \emph{w\^{}x} Memory