[FD] ifixit Bug Bounty #5 - Guide Search Persistent Vulnerability

Document Title: =============== ifixit Bug Bounty #5 - Guide Search Persistent Vulnerability References (Source): ==================== http://ift.tt/1PEQyeQ Video: http://ift.tt/1oIPKgb Release Date: ============= 2016-02-17 Vulnerability Laboratory ID (VL-ID): ==================================== 1700 Common Vulnerability Scoring System: ==================================== 3.8 Product & Service Introduction: =============================== The free repair guide for everything, written by everyone. iFixit is a private company in San Luis Obispo, California. Founded in 2003 while the founders were attending Cal Poly, the company sells repair parts and publishes free wiki-like online repair guides for consumer electronics and gadgets on its web site. (Copy of the Vendor Homepage: https://www.ifixit.com/ ) Abstract Advisory Information: ============================== The Vulnerability Laboratory Core Research Team discovered an application-side input validation web vulnerability in the official ifixit online service web-application. Vulnerability Disclosure Timeline: ================================== 2015-12-25: Researcher Notification & Coordination (Hadji Samir - Evolution Security GmbH) 2015-12-26: Vendor Notification (iFixIt Security Team) 2015-12-29: Vendor Response/Feedback (iFixIt Security Team) 2016-02-01: Vendor Fix/Patch (iFixIt Developer Team) 2016-02-15: Security Acknowledgements (iFixIt Security Team) 2016-02-17: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A persistent cross site scripting web vulnerability has been discovered in the official ifixit online service web-application. The vulnerability allows remote attackers to inject own malicious script codes to the application-side of the vulnerable modules context. The vulnerability is located in the `title name` value of the `guides` and `prerequisite guides` search modules. Remote attackers with low privileged web-application user accounts are able to inject own malicious script codes to the application-side of the affected POST/GET method request. The attack vector of the vulnerability is located on the application-side and the request method to inject is POST. The execution of the inserted payload occurs in the search module were the `guides` and `prerequisite guides` becomes available with keyword. The security risk of the filter bypass and persistent validation vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 3.8. Exploitation of the persistent input validation web vulnerability requires a low privileged web-application user accountand low or medium user interaction. Successful exploitation of the vulnerability results in session hijacking, persistent phishing, persistent external redirects to malicious source and persistent manipulation of affected or connected application modules. Request Method(s): [+] POST Vulnerable Module(s): [+] `guides` [+] `prerequisite guides` Vulnerable Parameter(s): [+] title name (Guide) Affected Module(s): [+] Search Guide Proof of Concept (PoC): ======================= The persistent cross site vulnerability can be exploited by remote attackers with low privileged web-application user account and low user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. I create Guide with title name as script code payload Note: Payload - Samir"> 2. Now the attacker needs to create new Guide page 3. After the adding procedure he clicks to the details 4. In the List any prerequisite guides in the searching i write Samir and i get the title about the last Guide page 5. Samir"> Now the code XSS executes via payload metatag 6. Successful reproduce of the persistent cross site scripting vulnerability! PoC: Exploitcode

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