Cross-site scripting in Multiplayer Games Plugin for WordPress

1) Cross-site scripting

EUVDB-ID: #VU56010

Risk: Low

CVSSv3.1: 5.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-34644

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the $_SERVER['PHP_SELF'] in the ~/multiplayergames.php file. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Multiplayer Games Plugin: 2.0 - 3.7

CPE2.3

• cpe:2.3:a:cleoni:multiplayer-plugin:2.0:*:*:*:*:*:*:
• cpe:2.3:a:cleoni:multiplayer-plugin:2.0.1:*:*:*:*:*:*:
• cpe:2.3:a:cleoni:multiplayer-plugin:2.0.2:*:*:*:*:*:*:

External links

http://www.wordfence.com/vulnerability-advisories/#CVE-2021-34644
http://plugins.trac.wordpress.org/browser/multiplayer-plugin/trunk/multiplayergames.php#L662

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.