ZKTime Web Software 2.0 Insecure Direct Object Reference

`Exploit Title: ZKTime Web Software 2.0 - Broken Authentication  
CVE-ID: CVE-2017-14680  
Vendor Homepage: https://www.zkteco.com/product/ZKTime_Web_2.0_435.html  
Vendor of Product: ZKTeco  
Affected Product Code: ZKTime Web - 2.0.1.12280  
Category: WebApps  
Author: Arvind V.  
Author Social: @Find_Arvind  
  
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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.  
  
Attack Description:  
The Application is a time attendance software which allows users to  
download their time and attendance data from the application in a PDF  
Format. The data includes their employeeas id, user-id, gender,  
birth-dates, phone numbers and access-areas. These PDF Files however are  
not properly authenticated. If any user get access to the file-download  
link, he can go ahead and download these files directly without any  
authentication.  
  
Proof of Concept Links:  
  
1) http://XX.XX.XX.XX:8081/tmp/report_file/Personnel_20170820144237.pdf  
<http://xx.xx.xx.xx:8081/tmp/report_file/Personnel_20170820144237.pdf>  
2) http://XX.XX.XX.XX:8081/tmp/report_file/Personnel_20170820144238.pdf  
<http://xx.xx.xx.xx:8081/tmp/report_file/Personnel_20170820144238.pdf>  
3) http://XX.XX.XX.XX:8081/tmp/report_file/Personnel_20170820144239.pdf  
<http://xx.xx.xx.xx:8081/tmp/report_file/Personnel_20170820144239.pdf>  
  
  
Impact:  
Personal details pertaining to the employees of the company are disclosed  
without their permissions. This leads to violation of user privacy.  
Moreover the information available can be used to mount further attacks.  
  
References:  
http://seclists.org/fulldisclosure/2017/Sep/39  
http://seclists.org/bugtraq/2017/Sep/20  
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-14680  
  
  
Vulnerability Timeline:  
18th August 2017 a Vulnerability Discovered  
20th August 2017 a Contacted Vendor a No Response  
1st September 2017 a Contacted Vendor again a No Response  
18th September 2017 a Vulnerability Disclosed  
  
`