Blackcat CMS 1.2 Cross Site Scripting
Posted on 24 June 2017
# Exploit Title : Blackcat CMS XSS Vulnerability # Date: 21/June/2017 # Exploit Author: Faiz Ahmed Zaidi Organization: Provensec LLC Website: http://provensec.com/ # Vendor Homepage: https://blackcat-cms.org/ # Software Link: https://blackcat-cms.org/page/download.php # Version: blackcatcms_v1.2_Bundle # Tested on: Windows 10 (Xampp) # CVE : CVE-2017-9609 Suggested description: I would like to report a vulnerability that I discovered in BlackCat CMS (blackcatcms_v1.2_Bundle), which can be exploited to perform Cross-Site Scripting (XSS) attacks. The vulnerability exists due to insufficient sanitization of the amap_languagea HTTP POST parameter passed to a/backend/pages/lang_settings.php?page_id=1a script.The exploitation example below uses the "alert()" JavaScript function to display "Provensec" word. Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted web sites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser side script, to a different end user. Flaws that allow these attacks to succeed are quite widespread and occur anywhere a web application uses input from a user within the output it generates without validating or encoding it. An attacker can use XSS to send a malicious script to an unsuspecting user. The end user's browser has no way to know that the script should not be trusted, and will execute the script. Because it thinks the script came from a trusted source; the malicious script can access any cookies, session tokens, or other sensitive information retained by the browser and used with that site. These scripts can even rewrite the content of the HTML page. ------------------------------------------ Vulnerability Type: Cross Site Scripting (XSS) ------------------------------------------ Vendor of Product: Black Cat Development ------------------------------------------ Affected Product Code Base: Blackcat CMS (https://blackcat-cms.org/) - blackcatcms_v1.2_Bundle ------------------------------------------ Affected Component: https://localhost/blackcatcms_v1.2_Bundle/backend/pages/lang_settings.php https://localhost/blackcatcms_v1.2_Bundle/backend/pages/lang_settings_save.php ------------------------------------------ Attack Type: Remote ------------------------------------------ Attack Vectors: Steps: 1.Login to BlackCat CMS. 2.Open the URL "https://localhost/blackcatcms_v1.2_Bundle/backend/pages/lang_settings.php?page_id=1". 3.Create and Save the Create link. 4.Tamper the "map_language" parameter and insert payload in it. Here, payload I used a<script>alert(/Provensec/)</script>a. 5.Forward the tampered request. 6.XSS gets executed on "https://localhost/blackcatcms_v1.2_Bundle/backend/pages/lang_settings_save.php" page. ------------------------------------------ Reference: https://www.owasp.org/index.php/Cross-site_Scripting_(XSS) ------------------------------------------ Discoverer: Author: Faiz Ahmed Zaidi Organization: Provensec LLC Website: http://provensec.com/ ------------------------------------------ *-- * *Thanks & Regards* *Faiz Ahmed Zaidi* *Information Security Researcher * *Provensec* <http://provensec.com/>* *
