============================================= MGC ALERT 2014-002 - Original release date: March 5, 2014 - Last revised: November 17, 2014 - Discovered by: Manuel Garcia Cardenas - Severity: 4,8/10 (CVSS Base Score) ============================================= I. VULNERABILITY ------------------------- Reflected XSS in Nibbleblog <= v4.0.1 II. BACKGROUND ------------------------- Nibbleblog is a powerful engine for creating blogs, all you need is PHP to work. III. DESCRIPTION ------------------------- Has been detected a reflected XSS vulnerability in Nibbleblog, 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 index.php parameters "author_name" and "content". IV. PROOF OF CONCEPT ------------------------- Malicious Request: http://vulnerablesite.com/nibbleblog/index.php?controller=post&action=view&id_post=1 hash=10905d09405f5db41d3c6645fd23e72746f76106&author_name=<XSS injection>&author_email=&content=<XSS injection> Example: http://vulnerablesite.com/nibbleblog/index.php?controller=post&action=view&id_post=1 hash=10905d09405f5db41d3c6645fd23e72746f76106&author_name=%22%3E%3Cscript%3Ealert%281%29%3C%2Fscript%3E&author_email=&content=%22%3E%3Cscript%3Ealert%281%29%3C%2Fscript%3E 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 ------------------------- Nibbleblog <= v4.0.1 VII. SOLUTION ------------------------- Update to version 4.0.2 VIII. REFERENCES ------------------------- http://www.nibbleblog.com/ http://blog.nibbleblog.com/post/nibbleblog-v4.0.2-coffee/ IX. CREDITS ------------------------- This vulnerability has been discovered and reported by Manuel Garcia Cardenas (advidsec (at) gmail (dot) com). X. REVISION HISTORY ------------------------- March 5, 2014 1: Initial release November 17, 2014 2: Last revision XI. DISCLOSURE TIMELINE ------------------------- March 5, 2014 1: Vulnerability acquired by Manuel Garcia Cardenas March 5, 2014 2: Send to vendor March 7, 2014 3: New version that includes patched code http://blog.nibbleblog.com/post/nibbleblog-v4.0.2-coffee/ November 17, 2014 4: 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