============================================= MGC ALERT 2015-001 - Original release date: September 08, 2015 - Last revised: September 24, 2015 - Discovered by: Manuel Garcia Cardenas - Severity: 4,8/10 (CVSS Base Score) ============================================= I. VULNERABILITY ------------------------- Stored XSS in 4images <= v1.7.11 II. BACKGROUND ------------------------- 4images is a powerful web-based image gallery management system. Features include comment system, user registration and management, password protected administration area with browser-based upload and HTML templates for page layout and design. III. DESCRIPTION ------------------------- Has been detected a stored XSS vulnerability in 4images, that allows the execution of arbitrary HTML/script code to be executed in the context of the victim user's browser. The code injection is done through the parameter warning in the page categories.php parameters "cat_description". IV. PROOF OF CONCEPT ------------------------- Malicious Request: http://vulnerablesite.com/4images/admin/categories.php __csrf=&action=updatecat&cat_id=1&cat_name=example&cat_description=<XSS injection>&cat_parent_id=0&cat_order=5&cat_hits=2285&auth_viewcat=0&auth_viewimage=0&auth_download=2&auth_upload=2&auth_directupload=9&auth_vote=0&auth_sendpostcard=0&auth_readcomment=0&auth_postcomment=2 Example: http://vulnerablesite.com/4images/categories.php?cat_id=1 V. BUSINESS IMPACT ------------------------- An attacker can execute arbitrary HTML or script code in a targeted user's browser, this can leverage to steal sensitive information as user credentials, personal data, etc. VI. SYSTEMS AFFECTED ------------------------- 4images <= v1.7.11 VII. SOLUTION ------------------------- Update to the last version. VIII. REFERENCES ------------------------- http://www.4homepages.de/ IX. CREDITS ------------------------- This vulnerability has been discovered and reported by Manuel Garcia Cardenas (advidsec (at) gmail (dot) com). X. REVISION HISTORY ------------------------- September 08, 2015 1: Initial release September 24, 2015 2: Last revision XI. DISCLOSURE TIMELINE ------------------------- September 08, 2015 1: Vulnerability acquired by Manuel Garcia Cardenas September 08, 2015 2: Send to vendor September 24, 2015 3: Sent to lists XII. LEGAL NOTICES ------------------------- The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. XIII. ABOUT ------------------------- Manuel Garcia Cardenas Pentester