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ZKTeco ZKTime.Net 3.0.1.6 Insecure File Permissions

Low
Advisory ID
ZSL-2016-5360
Release Date
30 August 2016
Vendor
ZKTeco Inc. - http://www.zkteco.com
Affected Version
3.0.1.6, 3.0.1.5 (160622), 3.0.1.1 (160216)
Tested On
Microsoft Windows 7 Ultimate SP1 (EN), Microsoft Windows 7 Professional SP1 (EN)
Summary

ZKTime.Net V3.0 is a new generation time attendance management software. Meanwhile, it integrates with time attendance and access control system. Some frequently used functions such as attendance reports, device management and employee management can be managed directly on the home page which providing excellent user experience. Owing to the Pay code function, it can generate both time attendance records and corresponding payroll in the software and easy to merge with the most ERP and Payroll software, which can rapidly upgrade your working efficiency. The brand new flat GUI design and humanized structure will make your daily management more pleasant and convenient.

Description

ZKTime.Net suffers from an elevation of privileges vulnerability which can be used by a simple user that can change the executable file with a binary of choice. The vulnerability exist due to the improper permissions, with the 'C' flag (Change) for 'Everyone' group, making the entire directory 'ZKTimeNet3.0' and its files and sub-dirs world-writable.

Proof of Concept
Disclosure Timeline
18.07.2016Vulnerability discovered.
27.07.2016Vendor contacted.
29.08.2016No response from the vendor.
30.08.2016Public security advisory released.
Credits
Vulnerability discovered by Gjoko Krstic
References
Changelog
30.08.2016Initial release
26.09.2016Added reference [1], [2], [3] and [4]
24.03.2026Added reference [5]