Title: WEG SuperDrive G2 v12.0.0 Insecure File Permissions
Advisory ID: ZSL-2016-5294
Type: Local
Impact: Privilege Escalation
Risk: (2/5)
Release Date: 16.01.2016

Summary

SuperDrive is a Windows graph tool for parameter setting, control and monitor of WEG Drives. It permits to edit directly in the drive online parameters, or to edit offline parameter files stored in the microcomputer. It enables you to store parameters of all drives that exist in the installation. The software also incorporates functions enable the upload to the drive of the microcomputer parameters sets as well as the download from the drive to the microcomputer. The communication between drive and microcomputer is realized via RS232 serial interface (point to point) or by RS485 for network linkage.

Description

SuperDrive 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 'C' flag (Change) for 'Authenticated Users' group.

Vendor

WEG Group - http://www.weg.net

Affected Version

SuperDrive G2 (v12.0.0 Build 20150930-J1.8.0_60-NB8.0.2)
SuperDrive (v7.0.0)

Tested On

Microsoft Windows 7 Ultimate SP1 (EN)
Microsoft Windows 7 Professional SP1 (EN)
Java 1.8.0_60

Vendor Status

[25.11.2015] Vulnerability discovered.
[05.12.2015] Vendor contacted.
[15.01.2016] No response from the vendor.
[16.01.2016] Public security advisory released.

PoC

superdrive_eop.txt

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[1] https://cxsecurity.com/issue/WLB-2016010101
[2] https://www.exploit-db.com/exploits/39260/
[3] https://packetstormsecurity.com/files/135306
[4] https://exchange.xforce.ibmcloud.com/vulnerabilities/109736

Changelog

[16.01.2016] - Initial release
[17.01.2016] - Added reference [1]
[18.01.2016] - Added reference [2]
[19.01.2016] - Added reference [3]
[21.01.2016] - Added reference [4]

Contact

Zero Science Lab

Web: http://www.zeroscience.mk
e-mail: lab@zeroscience.mk