CSV injection in Hustle WordPress plugin

1) Code injection

EUVDB-ID: #VU18732

Risk: Low

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-11872

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The disclosed 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. A remote non-authenticated 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 allow a remote attacker to execute arbitrary code on the system but requires that the administrator performs malicious data export into CSV format and opens it with an application that will execute the injected code.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Hustle – Pop-Ups, Slide-ins and Email Opt-ins: 3.0 - 6.0.7

External links

http://blog.reddy.io/2019/05/24/reddy-solutions-found-a-csv-injection-vulnerability-in-hustle-wordpress-plugin/
http://blog.reddy.io/category/cybersecurity/
http://wordpress.org/plugins/wordpress-popup/#developers

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.