CVE-2021-4096

Fancy Product Designer <= 4.7.5 - Cross-Site Request Forgery to Arbitrary File Upload

2022-04-14 00:00
Lin Yu

Strategic Overview

Status
Patched in 4.7.6
Affected Plugin
Fancy Product Designer
Affected Version
<= 4.7.5
CVSS
8.8High
Weakness type
CWE-352 · Cross-Site Request Forgery (CSRF)
CVE
CVE-2021-4096
View all Fancy Product Designer vulnerabilities

At a glance

CVE-2021-4096 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability in the Fancy Product Designer WordPress plugin, affecting versions <= 4.7.5. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 4.7.6; sites on affected versions should update now. Disclosed April 2022, reported by Lin Yu.

Vulnerability Overview

The Fancy Product Designer plugin for WordPress is vulnerable to Cross-Site Request Forgery via the FPD_Admin_Import class that makes it possible for attackers to upload malicious files that could be used to gain webshell access to a server in versions up to, and including, 4.7.5.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-352: Cross-Site Request Forgery (CSRF)

Reaching this weakness in Fancy Product Designer <= 4.7.5 takes a caller who can reach the endpoint. Cross-site request forgery abuses the fact that browsers attach a victim's cookies to any request, so a state-changing action that only checks who you are, not whether you meant to act, can be triggered from another site.

An attacker who gets a logged-in user to load a crafted page can perform that action as them, with the impact scaling to whatever the victim's role is allowed to do. For Fancy Product Designer the fix is 4.7.6: builds <= 4.7.5 are affected, anything from 4.7.6 onward is not.

Remediation

Update to version 4.7.6, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Fancy Product Designer: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Fancy Product Designer 4.7.6 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-4096https://www.wordfence.com/threat-intel/vulnerabilities/id/232a274f-c194-4c5b-a1a8-899a822e47fchttps://nvd.nist.gov/vuln/detail/CVE-2021-4096

Related records

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