CVE-2021-4391

Ultimate Gift Cards for WooCommerce <= 2.1.1 - Cross-Site Request Forgery Bypass

2021-06-21 00:00

Strategic Overview

Status: Patched in 2.1.2
Affected Plugin: Ultimate Gift Cards for WooCommerce
Affected Version: <= 2.1.1
CVSS: 4.3Medium
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2021-4391

View all Ultimate Gift Cards for WooCommerce vulnerabilities

At a glance

CVE-2021-4391 is a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the Ultimate Gift Cards for WooCommerce WordPress plugin, affecting versions <= 2.1.1. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.1.2; sites on affected versions should update now. Disclosed June 2021, reported by Jerome Bruandet.

Vulnerability Overview

The Ultimate Gift Cards for WooCommerce plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.1.1. This is due to missing or incorrect nonce validation on the mwb_wgm_save_post() function. This makes it possible for unauthenticated attackers to modify product gift card details via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

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.

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

Ultimate Gift Cards for WooCommerce <= 2.1.1 carries this weakness at mwb_wgm_save_post(), and reaching it 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 Ultimate Gift Cards for WooCommerce the fix is 2.1.2: builds <= 2.1.1 are affected, anything from 2.1.2 onward is not.

Remediation

Update to version 2.1.2, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Ultimate Gift Cards for WooCommerce: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Ultimate Gift Cards for WooCommerce 2.1.2 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-4391 https://www.wordfence.com/threat-intel/vulnerabilities/id/2da322ea-0206-4838-8ac4-9dd201bb00bc https://nvd.nist.gov/vuln/detail/CVE-2021-4391

Related records

Other vulnerabilities in Ultimate Gift Cards for WooCommerce

CVSS Vector

4.3

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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