Vulnerability identifier: #VU33669

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-502

Exploitation vector: Network

Exploit availability: No

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

Vendor: Stefano Lissa

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to the "restore_options_from_request" function called by the AJAX function "tnpc_render_callback" runs "unserialize" directly on "$options['inline_edits']" which is provided by user input in the "options" parameter. A remote authenticated attacker can pass specially crafted data to the application and execute arbitrary code on the target system.

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

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Newsletter: 1.0.9 - 6.8.1

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External links
http://wpvulndb.com/vulnerabilities/10340/
http://www.wordfence.com/blog/2020/08/newsletter-plugin-vulnerabilities-affect-over-300000-sites/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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