writeup.md

The cat command on server is malfunctioning, which command said cat command is using /bin/cat. To correct it, we remove /bin/cat, the whole vm is built upon busybox, so soft link /bin/busybox to /bin/cat.

rm -f /bin/cat
ln -s /bin/busybox /bin/cat

cat /dev/safe to get the flag.

cat /dev/safe
Hero{s0_yOu_C4n_r34d_Fr0m_cHrD3v}