working

cscg25/rev/intro1/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

cscg25/rev/intro1/flag.txt

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+CSCG{testflag}