CVE-2023-6220

Piotnet Forms <= 1.0.28 - Unauthenticated Arbitrary File Upload

2023-12-04 00:00
István Márton

Strategic Overview

Status
Patched in 1.0.29
Affected Plugin
Piotnet Forms
Affected Version
<= 1.0.28
CVSS
8.1High
Weakness type
CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE
CVE-2023-6220
View all Piotnet Forms vulnerabilities

At a glance

CVE-2023-6220 is a high-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Piotnet Forms WordPress plugin, affecting versions <= 1.0.28. It carries a CVSS score of 8.1 (reachable over the network; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 1.0.29; sites on affected versions should update now. Disclosed December 2023, reported by István Márton.

Vulnerability Overview

The Piotnet Forms plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient file type validation in the 'piotnetforms_ajax_form_builder' function in versions up to, and including, 1.0.28. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-434: Unrestricted Upload of File with Dangerous Type

Piotnet Forms <= 1.0.28 carries this weakness at piotnetforms_ajax_form_builder, and reaching it takes no account at all. An unrestricted file upload lets a caller store a file whose type or destination the application does not properly constrain.

If an uploaded file lands anywhere the server will execute, the flaw becomes remote code execution and the site should be treated as fully compromised. For Piotnet Forms the fix is 1.0.29: builds <= 1.0.28 are affected, anything from 1.0.29 onward is not.

Remediation

Update to version 1.0.29, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Piotnet Forms 1.0.29 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Login Security

External References

https://www.cve.org/CVERecord?id=CVE-2023-6220https://www.wordfence.com/threat-intel/vulnerabilities/id/af2b7eac-a3f5-408f-b139-643e70b3f27ahttps://nvd.nist.gov/vuln/detail/CVE-2023-6220

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C