Title: Realtek 11n Wireless LAN Utility Privilege Escalation
Advisory ID: ZSL-2015-5228
Type: Local
Impact: Privilege Escalation
Risk: (2/5)
Release Date: 24.02.2015

Summary

Realtek 11n Wireless LAN utility is deployed and used by realtek alfa cards and more in order to help diagnose and view wireless card properties.

Description

The application suffers from an unquoted search path issue impacting the Realtek Service 'Realtek11nSU' and 'Realtek11nCU' for Windows deployed as part of 11n USB Wireless LAN Utility. This could potentially allow an authorized but non-privileged local user to execute arbitrary code with elevated privileges on the system. A successful attempt would require the local user to be able to insert their code in the system root path undetected by the OS or other security applications where it could potentially be executed during application startup or reboot. If successful, the local user’s code would execute with the elevated privileges of the application.

Vendor

Realtek Semiconductor Corp. - http://www.realtek.com.tw

Affected Version

700.1631.106.2011

Tested On

Microsoft Windows 7

Vendor Status

N/A

PoC

realtek_eop.txt

Credits

Vulnerability discovered by Humberto Cabrera - <humbe@zeroscience.mk>

References

[1] https://eaty0face.wordpress.com/2015/02/13/realtek-11n-wireless-lan-utility-privilege-escalation/
[2] http://www.exploit-db.com/exploits/36062/
[3] http://packetstormsecurity.com/files/130515
[4] http://osvdb.org/show/osvdb/118748
[5] https://exchange.xforce.ibmcloud.com/#/vulnerabilities/101203

Changelog

[24.02.2015] - Initial release
[25.02.2015] - Added reference [3]
[26.02.2015] - Added reference [4]
[12.03.2015] - Added reference [5]

Contact

Zero Science Lab

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