Peplink NGxxx/LCxxx VPN-Firewall Open Redirect Vulnerability

Title: Peplink NGxxx/LCxxx VPN-Firewall Open Redirect Vulnerability
Advisory ID: ZSL-2016-5376
Type: Local/Remote
Impact: Spoofing
Risk: (2/5)
Release Date: 29.11.2016
The NG500 / 520 is a high-performance VPN server, which is suitable for small and medium enterprises to use as a VPN center. It is simple to deploy and high security. At the same time, NG500 / 520 products also integrates advanced firewall features to support access to computers by group, by region, according to the strategy, according to rules management; support office network and business network isolation to ensure data server security. At the same time, NG500 / NG520 support intelligent flow control function, can reserve bandwidth for VPN, to ensure the fluency of critical applications, to prevent network congestion.

The NG300 / 320 products are cost-effective VPN branch gateway products, support to drive the entire LAN access to the headquarters network to support LAN TO LAN interconnection. NG300 / 320 integrated online behavior management function, you can achieve P2P, QQ, MSN and other application control and site filtering and other functions, support QoS traffic priority control technology, VPN applications can reserve bandwidth to ensure the stability of remote enterprise data transmission.
Input passed via the '_redirect' GET parameter via 'service.cgi' script is not properly verified before being used to redirect users. This can be exploited to redirect a user to an arbitrary website e.g. when a user clicks a specially crafted link to the affected script hosted on a trusted domain.
Qingdao Xunbo Information Technology Co., Ltd. -
Affected Version
PEPLINK NG300 VPN-Firewall
PEPLINK NG320-VPN-Firewall
PEPLINK NG500-VPN-Firewall
PEPLINK NG520-VPN-Firewall
PEPLINK LC500-VPN-Firewall
Tested On
VPN OS 2.6 UTM Base/027R12-newvpn-3.53r
Vendor Status
Vulnerability discovered by Gjoko Krstic - <>
[29.11.2016] - Initial release
[08.12.2016] - Added reference [1], [2] and [3]
Zero Science Lab