Description
FUDForum 3.0.9 is vulnerable to Stored XSS via the User-Agent HTTP header. This may result in remote code execution. An attacker can use a user account to fully compromise the system via a GET request. When the admin visits user information under "User Manager" in the control panel, the payload will execute. This will allow for PHP files to be written to the web root, and for code to execute on the remote server. The problem is in admsession.php and admuser.php.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- FUDForum 3.0.9 - Remote Code Execution EDB-47650 · webapps · Nov 13, 2019
GitHub 1 repository
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fuzzlove/FUDforum-XSS-RCE ★ 7 · Oct 27, 2019
FUDForum 3.0.9 - XSS / Remote Code Execution (CVE-2019-18873, CVE-2019-18839)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.