Gjoko KrsticZSL-2021-5627SmartFoxServer 2X 2.17.0 Credentials Disclosure
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
24.8%
Title: SmartFoxServer 2X 2.17.0 Credentials Disclosure
Advisory ID: ZSL-2021-5627
Type: Local
Impact: Exposure of Sensitive Information, Security Bypass
Risk: (3/5)
Release Date: 07.02.2021
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
The application stores sensitive information in an unencrypted XML file called /config/server.xml. A local attacker that has access to the current user session can successfully disclose plain-text credentials that can be used to bypass authentication to the affected server.
Vendor
gotoAndPlay() - <https://www.smartfoxserver.com>
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
Vendor Status
[29.01.2021] Vulnerability discovered.
[29.01.2021] Asked vendor about the console module, how to enable it.
[30.01.2021] No response.
[31.01.2021] Vendor contacted.
[01.02.2021] Vendor asks more details.
[01.02.2021] Sent details to the vendor.
[01.02.2021] Vendor responds.
[01.02.2021] Replied to the vendor, asking for a plan.
[03.02.2021] Vendor will fix the Credentials Disclosure. Other issues are working as expected.
[07.02.2021] Public security advisory released.
PoC
Credits
Vulnerability discovered by Gjoko Krstic - <[email protected]>
References
[1] <https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-26550>
[2] <https://nvd.nist.gov/vuln/detail/CVE-2021-26550>
[3] <https://www.exploit-db.com/exploits/49527>
[4] <https://packetstormsecurity.com/files/161337/>
[5] <https://cxsecurity.com/issue/WLB-2021020034>
[6] <https://exchange.xforce.ibmcloud.com/vulnerabilities/196350>
[7] <https://www.tenable.com/cve/CVE-2021-26550>
Changelog
[07.02.2021] - Initial release
[10.02.2021] - Added reference [3], [4], [5], [6] and [7]
Contact
Zero Science Lab
Web: <https://www.zeroscience.mk>
e-mail: [email protected]
<html><body><p>SmartFoxServer 2X 2.17.0 Credentials Disclosure
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: The application stores sensitive information in an
unencrypted XML file called /config/server.xml. A local
attacker that has access to the current user session can
successfully disclose plain-text credentials that can be
used to bypass authentication to the affected server.
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-2021-5627
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5627.php
CVE ID: CVE-2021-26550
CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-26550
NIST URL: https://nvd.nist.gov/vuln/detail/CVE-2021-26550
CWE ID: CWE-312
CWE URL: https://cwe.mitre.org/data/definitions/312.html
29.01.2021
--
PS C:\Users\t00t\SmartFoxServer_2X\SFS2X\config> Get-Content server.xml | Select-String -Pattern passw -Context 1,0
<login>sfsadmin</login>
> <password>Waddup</password>
<login>testingus</login>
> <password>123456</password>
<mailuser>username</mailuser>
> <mailpass>password</mailpass>
C:\Users\t00t\SmartFoxServer_2X\SFS2X\config>icacls server.xml
server.xml NT AUTHORITY\SYSTEM:(I)(F)
BUILTIN\Administrators:(I)(F)
LAB42\t00t:(I)(F)
</p></body></html>Related
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:L/Au:N/C:P/I:N/A:N
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AI Score
Confidence
High
EPSS
Percentile
24.8%