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H3C SSL VPN Username Enumeration

Low
Advisory ID
ZSL-2022-5697
Release Date
12 February 2022
Vendor
Hangzhou H3C Technologies Co., New H3C Technologies Co., Ltd. - https://www.h3c.com
Affected Version
N/A
Tested On
ssl vpn gateway HttpServer 1.1
Summary

H3C SSL VPN is a secure VPN system based on SSL connections. It allows mobile employees to access corporate networks remotely in an easy and secure way. The H3C SSL VPN devices are a new generation of professional SSL VPN devices for enterprises. They can function as ingress gateways as well as proxy gateways of internal server clusters. The SecPath SSL VPN devices are for small-to medium-sized enterprises, while the SecBlade SSL VPN devices are for medium-sized enterprises.

Description

The weakness is caused due to the login script and how it verifies provided credentials. An attacker can use this weakness to enumerate valid users on the affected application via 'txtUsrName' POST parameter.

Proof of Concept
Disclosure Timeline
N/A
Credits
Vulnerability discovered by Gjoko Krstic
References
Changelog
12.02.2022Initial release
16.02.2022Added reference [1], [2], [3] and [4]
24.03.2026Added reference [5]