Vulnerability identifier: #VU25777

Vulnerability risk: High

CVSSv3.1: 7.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-9372

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Appointment Booking Calendar
Web applications / Modules and components for CMS

Vendor: CodePeople, paypaldev

Description

The vulnerability allows a remote attacker to inject arbitrary code into CSV files.

The vulnerability exists due to insufficient sanitization of user-supplied data when constructing CSV files in fields such as Description or Name in any booking form. A remote attacker can inject malicious data into the contact form fields that is used later by the plugin to generate CSV files. Such files can be opened with Microsoft Excel built-in functions and utilize its functionality to execute malicious macros.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Appointment Booking Calendar: 1.3.01 - 1.3.34

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External links
http://drive.google.com/open?id=1NNcYPaJir9SleyVr4cSPqpI2LNM7rtx9
http://wordpress.org/plugins/appointment-booking-calendar/#developers
http://www.hotdreamweaver.com/support/view.php?id=815925

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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. However, proof of concept for this vulnerability is available.