Exploit/Advisories

# Exploit Title: Joplin 1.0.245 - Arbitrary Code Execution (PoC)
# Date: 2020-09-21
# Exploit Author: Ademar Nowasky Junior (@nowaskyjr)
# Vendor Homepage: https://joplinapp.org/
# Software Link: https://github.com/laurent22/joplin/releases/download/v1.0.245/Joplin-Setup-1.0.245.exe
# Version: 1.0.190 to 1.0.245
# Tested on: Windows / Linux
# CVE : CVE-2020-15930
# References:
# https://github.com/laurent22/joplin/commit/57d750bc9aeb0f98d53ed4b924458b54984c15ff

# 1. Technical Details
# An XSS issue in Joplin for desktop v1.0.190 to v1.0.245 allows arbitrary code execution via a malicious HTML embed tag.
# HTML embed tags are not blacklisted in Joplin's renderer. This can be chained with a bug where child windows opened through window.open() have node integration enabled to achieve ACE.
# If Joplin API is enabled, Remote Code Execution with user interaction is possible by abusing the lack of required authentication in Joplin 'POST /notes' api endpoint to remotely deploy the payload into the victim application.

# 2. PoC
# Paste the following payload into a note:

# 2.1 RCE with user interaction# Enable Joplin API, visit exploit.html and open the created note in Joplin to execute the exploit.# By default, notes are stored in the last notebook created.

# To create a note in other notebooks you need the notebook ID. It's possible to get the victim's notebooks IDs due to a relaxed CORS policy in 'GET /folders' endpoint.

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