WIP cscg24

cscg24/rev/intro_rev_1/Dockerfile

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+# run via docker compose :)
+
+FROM ubuntu:22.04
+
+RUN apt-get update
+
+RUN apt-get -y install socat 
+RUN useradd -d /home/ctf/ -m -p ctf -s /bin/bash ctf
+RUN echo "ctf:ctf" | chpasswd
+
+WORKDIR /home/ctf
+
+COPY rev1 .
+COPY flag.txt .
+
+USER ctf
+CMD socat -ddd TCP4-LISTEN:1024,fork,reuseaddr exec:./rev1,pty,echo=0,raw,iexten=0

cscg24/rev/intro_rev_1/flag.txt

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+CSCG{testflag}

cscg24/rev/intro_rev_2/Dockerfile

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+# run via docker compose :)
+
+FROM ubuntu:22.04
+
+RUN apt-get update
+
+RUN apt-get -y install socat 
+
+RUN useradd -d /home/ctf/ -m -p ctf -s /bin/bash ctf
+RUN echo "ctf:ctf" | chpasswd
+
+WORKDIR /home/ctf
+
+COPY rev2 .
+COPY flag.txt .
+
+USER ctf
+CMD socat -ddd TCP4-LISTEN:1024,fork,reuseaddr exec:./rev2,pty,echo=0,raw,iexten=0

cscg24/rev/intro_rev_2/decode_password.py

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+encoded_passwd = b"\x02\xea\x02\xe8\xfc\xfd\xbd\xfd\xf2\xec\xe8\xfd\xfb\xea\xf7\xfc\xef\xb9\xfb\xf6\xea\xfd\xf2\xf8\xf7\x00"
+
+
+def decode(char: int):
+    return char + 0x77
+
+
+for char in encoded_passwd:
+    print(chr(decode(char)), end="")

cscg24/rev/intro_rev_2/flag.txt

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+CSCG{testflag}