SmartFoxServer 2X 2.17.0 God Mode Console WebSocket XSS

🗓️ 07 Feb 2021 00:00:00Reported by Gjoko KrsticType

zeroscience🔗 www.zeroscience.mk👁 301 Views

SmartFoxServer 2X 2.17.0 God Mode Console WebSocket XSS. Authenticated Cross-Site Scripting vulnerability. Vendor response inadequate

Reporter	Title	Published	Views	Family All 10
Circl	CVE-2021-26549	30 May 202103:05	–	circl
CNNVD	GotoAndPlay SNC SmartFoxServer Cross-Site Scripting Vulnerability	8 Feb 202100:00	–	cnnvd
CVE	CVE-2021-26549	9 Feb 202119:03	–	cve
Cvelist	CVE-2021-26549	9 Feb 202119:03	–	cvelist
EUVD	EUVD-2021-13348	7 Oct 202500:30	–	euvd
NVD	CVE-2021-26549	9 Feb 202120:15	–	nvd
OSV	CVE-2021-26549	9 Feb 202120:15	–	osv
Packet Storm	SmartFoxServer 2X 2.17.0 God Mode Console WebSocket Cross Site Scripting	8 Feb 202100:00	–	packetstorm
Prion	Cross site scripting	9 Feb 202120:15	–	prion
RedhatCVE	CVE-2021-26549	22 May 202520:41	–	redhatcve

<html><body><p>SmartFoxServer 2X 2.17.0 God Mode Console WebSocket XSS


Vendor: gotoAndPlay()
Product web page: https://www.smartfoxserver.com
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.

-----------------------------------------------------------------
/ConsoleModuleReqHandler.java:
------------------------------

 private String checkHTML(String data) {
     if (data.indexOf(60) &gt; -1 &amp;&amp; data.indexOf("<span data='data.replaceAll("\\&lt;",' data.replaceall="" return="">", "&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: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5626.php

CVE ID: CVE-2021-26549
CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-26549
NIST URL: https://nvd.nist.gov/vuln/detail/CVE-2021-26549


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
</script></span></p></body></html>

07 Feb 2021 00:00Current

6.3Medium risk

Vulners AI Score6.3

CVSS 23.5

CVSS 3.15.4

EPSS0.01432