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SmartFoxServer 2X 2.17.0 God Mode Console WebSocket XSS

Low
Advisory ID
ZSL-2021-5626
Release Date
07 February 2021
Vendor
Affected Version
Server: 2.17.0, Remote Admin: 3.2.6, SmartFoxServer 2X, Pro, Basic
Tested On
Windows (all) 64bit installer, Linux/Unix 64bit installer, MacOS (10.8+) 64bit installer, Java 1.8.0_281, Python 3.9.1, Python 2.7.14
Summary

SmartFoxServer (SFS) is a comprehensive SDK for rapidly developing multiplayer games and applications with Adobe Flash/Flex/Air, Unity, HTML5, iOS, Universal Windows Platform, Android, Java, C++ and more. SmartFoxServer comes with a rich set of features, an impressive documentation set, tens of examples with their source, powerful administration tools and a very active support forum. Born in 2004, and evolving continuously since then, today SmartFoxServer is the leading middleware to create large scale multiplayer games, MMOs and virtual communities. Thanks to its simplicity of use, versatility and performance, it currently powers hundreds of projects all over the world, from small chats and turn-based games to massive virtual worlds and realtime games.

Description

Authenticated Cross-Site Scripting was discovered. Input passed to the AdminTool console is not properly sanitized before being returned to the user. This can be exploited to execute arbitrary HTML code in a user's browser session in context of an affected site.

Proof of Concept
Disclosure Timeline
29.01.2021Vulnerability discovered.
29.01.2021Asked vendor about the console module, how to enable it.
30.01.2021No response.
31.01.2021Vendor contacted.
01.02.2021Vendor asks more details.
01.02.2021Sent details to the vendor.
01.02.2021Vendor responds.
01.02.2021Replied to the vendor, asking for a plan.
03.02.2021Vendor will fix the Credentials Disclosure. Other issues are working as expected.
07.02.2021Public security advisory released.
Credits
Vulnerability discovered by Gjoko Krstic
References
Changelog
07.02.2021Initial release
10.02.2021Added reference [3], [4], [5], [6] and [7]