CVE-2021-4424

Slider Hero <= 8.2.0 - Cross-Site Request Forgery Bypass

2021-07-05 00:00

Strategic Overview

Status: Patched in 8.2.1
Affected Plugin: Slider Hero with Video Background, Animation
Affected Version: <= 8.2.0
CVSS: 4.3Medium
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2021-4424

View all Slider Hero with Video Background, Animation vulnerabilities

At a glance

CVE-2021-4424 is a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the Slider Hero with Video Background, Animation WordPress plugin, affecting versions <= 8.2.0. 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 8.2.1; sites on affected versions should update now. Disclosed July 2021, reported by Jerome Bruandet.

Vulnerability Overview

The Slider Hero plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 8.2.0. This is due to missing or incorrect nonce validation on the qc_slider_hero_duplicate() function. This makes it possible for unauthenticated attackers to duplicate slides 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)

Slider Hero with Video Background, Animation <= 8.2.0 carries this weakness at qc_slider_hero_duplicate(), 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 Slider Hero with Video Background, Animation the fix is 8.2.1: builds <= 8.2.0 are affected, anything from 8.2.1 onward is not.

Remediation

Update to version 8.2.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Slider Hero with Video Background, Animation: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Slider Hero with Video Background, Animation 8.2.1 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-4424 https://www.wordfence.com/threat-intel/vulnerabilities/id/e6d195cd-4df8-4926-b834-d695fc05f81d https://nvd.nist.gov/vuln/detail/CVE-2021-4424

Related records

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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