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V-SOL GPON/EPON OLT Platform v2.03 Remote Privilege Escalation

High
Advisory ID
ZSL-2019-5538
Release Date
26 September 2019
Vendor
Guangzhou V-SOLUTION Electronic Technology Co., Ltd. - https://www.vsolcn.com
Affected Version
V2.03.62R_IPv6, V2.03.54R, V2.03.52R, V2.03.49, V2.03.47, V2.03.40, V2.03.26, V2.03.24, V1.8.6, V1.4
Tested On
GoAhead-Webs
Summary

GPON is currently the leading FTTH standard in broadband access technology being widely deployed by service providers around the world. GPON/EPON OLT products are 1U height 19 inch rack mount products. The features of the OLT are small, convenient, flexible, easy to deploy, high performance. It is appropriate to be deployed in compact room environment. The OLTs can be used for 'Triple-Play', VPN, IP Camera, Enterprise LAN and ICT applications.

Description

The application suffers from a privilege escalation vulnerability. Normal user can elevate his/her privileges by sending a HTTP POST request setting the parameter 'user_role_mod' to integer value '1' gaining admin rights.

Proof of Concept
Disclosure Timeline
N/A
Credits
Vulnerability discovered by Gjoko Krstic
References
Changelog
26.09.2019Initial release
03.10.2019Added reference [1], [2], [3] and [4]
23.03.2026Added reference [5]