Vulnerability identifier: #VU8706

Vulnerability risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Appointments
Web applications / Modules and components for CMS

Vendor: WPMU DEV

Description
The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient filtration of user-supplied data passed to "/wp-admin/admin-ajax.php" script. A remote unauthenticated attacker can inject and execute arbitrary PHP code on the target server.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable web application and execute arbitrary OS commands on the affected web server.

Mitigation
Update to version 2.2.2.

Vulnerable software versions

Appointments: 2.0.3 - 2.2.0

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External links
http://www.wordfence.com/blog/2017/10/3-zero-day-plugin-vulnerabilities-exploited-wild/

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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.