Adobe Cross Site Scripting / Open Redirect
Posted on 19 February 2016
Document Title: =============== Adobe - Multiple Client Side Cross Site Scripting Web Vulnerabilities References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1628 PSIRT ID: 4260 / 4261 Release Date: ============= 2016-02-15 Vulnerability Laboratory ID (VL-ID): ==================================== 1628 Common Vulnerability Scoring System: ==================================== 3 Product & Service Introduction: =============================== Whether it is a smartphone or tablet app, a game, a video, a digital magazine, a website, or an online experience, chances are that it was touched by Adobe technology. Our tools and services enable our customers to create groundbreaking digital content, deploy it across media and devices, and then continually measure and optimize it based on user data. By providing complete solutions that combine digital media creation with data-driven marketing, we help businesses improve their communications, strengthen their brands, and ultimately achieve greater business success. (Copy of the Vendor Homepage: http://www.adobe.com/aboutadobe/) Abstract Advisory Information: ============================== An independent vulnerability laboratory researcher discovered multiple client-side vulnerabilities in the official adobe online-service web-application. Vulnerability Disclosure Timeline: ================================== 2015-10-29: Researcher Notification & Coordination (Daniel DÃez Tainta - DaniLabs) 2015-10-30: Vendor Notification (Adobe PSIRT - Security Acknowledgements) 2015-11-03: Vendor Response/Feedback (Adobe PSIRT - Security Acknowledgements) 2015-02-03: Vendor Fix/Patch (Adobe - Developer Team) 2015-02-14: Security Reward (Adobe PSIRT - Security Acknowledgements) 2015-02-15: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Adobe Systems Product: Online Service - Web Application 2015 Q4 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ Multiple client-side web vulnerabilities has been discovered in the official Adobe (arvato) online service web-application. The first vulnerability is a Cross Site Scripting of type reflected. The second vulnerability is an open redirect is an application that takes a parameter and redirects an user to the parameter value without any validation. The vulnerability is located in the `tduid` and `url` parameter values of the arvato_redirect.html file GET method request. The `tduid` parameter receives as argument `0`. The `url` parameter receives as argument an url or javascript code. Remote attackers are able to inject script codes to the client-side browser to application GET method requests. The attack vector of the issues are client-side and the request method to inject is GET. An attacker can send an url like http://www.vulnerability-lab.com and the request redirect to the external target url without approval. An attacker can also send a javascript code like `javascript:alert(documen.cookie)` and the request executes without secure validation. The security risk of the client-side web vulnerabilities are estimated as medium with a cvss (common vulnerability scoring system) count of 3.0. Exploitation of the non-persistent web vulnerabilities requires no privileged web application user account and low or medium user interaction. Successful exploitation of the vulnerability results in session hijacking, non-persistent phishing, non-persistent external redirects, non-persistent load of malicious script codes or non-persistent web module context manipulation. Request Method(s): [+] GET Vulnerable Module(s): [+] Adobe - arvato Vulnerable File(s): [+] arvato_redirect.html Vulnerable Parameter(s): [+] tduid [+] url Proof of Concept (PoC): ======================= The client-side vulnerabilities can be exploited by remote attackers without privileged web-application user account and with low or medium user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. PoC: Cross Site Scripting https://www.adobe.com/arvato_redirect.html?tduid=0&url=javascript:alert(document.domain) https://www.adobe.com/arvato_redirect.html?tduid=0javascript:alert%28document.cookie%29&url= PoC: Open Redirect https://www.adobe.com/arvato_redirect.html?tduid=0&url=http://www.google.es --- PoC Session Logs [GET] --- Status: OK[200] GET https://www.adobe.com/arvato_redirect.html?tduid=0&url=javascript:alert(document.cookie) Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[unknown] Mime Type[unknown] Request Header: Host[www.adobe.com] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate] Cookie[dtLatC=56; dtPC=198644794_638h1; TRADEDOUBLER=0; mbox=session#1446198637998-786547#1446200498|PC#1446198637998-786547.26_19#1449222639; s_sq=%5B%5BB%5D%5D; s_vi=[CS]v1|2B199EBC05314EB1-6000011420006DAD[CE]; sfdc_session=-; s_sess=%20s_cc%3Dtrue%3B%20s_cpc%3D1%3B%20s_sq%3D%3B%20s_demandbase_v2.2%3Ddone%3B%20s_dmdbase%3D%255Bn%252Fa%255D%253A%255Bn%252Fa%2 55D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253AWireless%253AMobile%2520Network%3B%20s_ dmdbase_custom%3DFuldabr%25C3%25BCck%253A05%253A34277%253ADE%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%253A%255Bn%252Fa%255D%3B; s_pers=%20s_fid%3D014AEA34CF75A081-30D64128250EAD69%7C1509357038901%3B%20s_vs%3D1%7C1446200438903%3B%20gpv%3Dno%2520value%7C1446200438906%3B%20s _nr%3D1446198638908-New%7C1477734638908%3B; s_cc=true; aam_uuid=88603075514468463170269453653802973821; dtCookie=87E42C5B5E16F929E67CA5354B350B54|QWRvYmUrZUNvbW1lcmNlfDE] PoC: Source (Arvato Affiliate tracking Redirect Page) function setCookie(name, value, expires, path, domain, secure) { console.log("Entering to set Cookie"); var today = new Date(); today.setTime( today.getTime() ); if ( expires ) { expires = expires * 1000 * 60 * 60 * 24; } var expires_date = new Date( today.getTime() + (expires) ); console.log(expires_date); document.cookie= name + "=" + escape(value) + ((expires) ? "; expires=" + expires_date.toGMTString() : "") + ((path) ? "; path=" + path : "") + ((domain) ? "; domain=" + domain : "") + ((secure) ? "; secure" : ""); console.log(document.cookie); } function getVar(name) { get_string = document.location.search; return_value = ''; do { name_index = get_string.indexOf(name + '='); if(name_index != -1) { get_string = get_string.substr(name_index + name.length + 1, get_string.length - name_index); end_of_value = get_string.indexOf('&'); if(end_of_value != -1) { value = get_string.substr(0, end_of_value); } else { value = get_string; } if(return_value == '' || value == '') { return_value += value; } else { return_value += ', ' + value; } } } while(name_index != -1) { space = return_value.indexOf('+'); } while(space != -1) { return_value = return_value.substr(0, space) + ' ' + return_value.substr(space + 1, return_value.length); space = return_value.indexOf('+'); } return(return_value); } function redirTo() { var strReturn = ""; var strHref = document.location.href; if ( strHref.indexOf("&url=") > -1 ) { strReturn = strHref.substr(strHref.indexOf("&url=")+5); } else { strReturn = "http://www.adobe.com"; } return strReturn; } var mytduid = getVar('tduid'); console.log("TDUID : "+mytduid); setCookie('TRADEDOUBLER', mytduid, 365,"/",".adobe.com",true); window.location = redirTo(); Reference(s): https://www.adobe.com/arvato_redirect.html Solution - Fix & Patch: ======================= The open vulnerability can be patched by a restriction of the requested parameters in the url value. Disallow special chars and use a whitelist to deny external redirects. The client-side cross site scripting vulnerability can be patched by a secure parse and encode of the vulnerable tduid value in the arvato_redirect.html file. Disallow special chars and filter the input to correct the context to prevent further client-side javascript code injection attacks against the web-application. Security Risk: ============== The security risk of the client-side cross site scripting web vulnerability in the adobe web-application is estimated as medium. (CVSS 3.0) The security risk of the client-side open redirect web vulnerability in the adobe web-application is estimated as low. (CVSS 2.1) Credits & Authors: ================== Daniel DÃez Tainta - (@DaniLabs) Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. 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