*1. Introduction* Vendor: ZKTeco Affected Product: ZKTime Web - 2.0.1.12280 Fixed in: Vendor Website: https://www.zkteco.com/product/ZKTime_Web_2.0_435.html Vulnerability Type: Cross Site Request Forgery Remote Exploitable: Yes CVE: CVE-2017-17056 *2. Product description* ZKTime Web 2.0 is a cutting edge Web-based Time Attendance software, which provided a stable communication for devices through GPRS/WAN, hence, users can access the software anywhere by their Web Browser to remotely manage hundreds of T&A terminals under complex network condition (WLAN). The Application has an administrator role and application user role. *3. Attack Description* The ZKTime Web Software allows the Administrator to elevate the privileges of the application user using a 'password_change()' function of the Modify Password component. An Attacker takes advantage of this scenario and creates a crafted link to add himself as an administrator to the ZKTime Web Software. He then uses social engineering methods to trick the administrator into click the forged http request. The request is executed and the attacker becomes the Administrator of the ZKTime Web Software. *4. Proof of Concept Code* Forged HTTP Request used by the attacker: *5. Impact* If the vulnerability is successfully exploited than an attacker (who would be a normal user of the web application) can escalate his privileges and become the administrator of ZK Time Web Software. *6. References* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17056 *7. Credit* Himanshu Mehta (@LionHeartRoxx)