ZKTeco ZKAccess Professional 3.5.3 Insecure File Permissions

Title: ZKTeco ZKAccess Professional 3.5.3 Insecure File Permissions
Advisory ID: ZSL-2016-5361
Type: Local
Impact: Privilege Escalation
Risk: (2/5)
Release Date: 30.08.2016
ZKAccess 3.5 is a desktop software which is suitable for small and medium businesses application. Compatible with all ZKAccess standalone reader controllers, the software can simultaneously manage access control and generate attendance report. The brand new flat GUI design and humanized structure of new ZKAccess 3.5 will make your daily management more pleasant and convenient.
ZKAccess suffers from an elevation of privileges vulnerability which can be used by a simple authenticated user that can change the executable file with a binary of choice. The vulnerability exist due to the improper permissions, with the 'M' flag (Modify) for 'Authenticated Users' group.
ZKTeco Inc. - http://www.zkteco.com
Affected Version
3.5.3 (Build 0005)
Tested On
Microsoft Windows 7 Ultimate SP1 (EN)
Microsoft Windows 7 Professional SP1 (EN)
Vendor Status
[18.07.2016] Vulnerability discovered.
[27.07.2016] Vendor contacted.
[29.08.2016] No response from the vendor.
[30.08.2016] Public security advisory released.
Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>
[1] https://cxsecurity.com/issue/WLB-2016080265
[2] https://exchange.xforce.ibmcloud.com/vulnerabilities/116486
[3] https://packetstormsecurity.com/files/138566
[4] https://www.exploit-db.com/exploits/40323/
[30.08.2016] - Initial release
[26.09.2016] - Added reference [1], [2], [3] and [4]
Zero Science Lab

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e-mail: lab@zeroscience.mk