CVE-2023-5820

Thumbnail Slider With Lightbox <= 1.0 - Cross-Site Request Forgery to Arbitrary File Upload

2023-10-26 00:00

Strategic Overview

Status: Patched in 1.0.1
Affected Plugin: Thumbnail Slider With Lightbox
Affected Version: 1.0
CVSS: 8.3High
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2023-5820

View all Thumbnail Slider With Lightbox vulnerabilities

At a glance

CVE-2023-5820 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability in the Thumbnail Slider With Lightbox WordPress plugin, affecting versions 1.0. It carries a CVSS score of 8.3 (reachable over the network; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 1.0.1; sites on affected versions should update now. Disclosed October 2023, reported by Ala Arfaoui.

Vulnerability Overview

The Thumbnail Slider With Lightbox plugin for WordPress is vulnerable to Cross-Site Request Forgery in version 1.0. This is due to missing or incorrect nonce validation on the addedit functionality. This makes it possible for unauthenticated attackers to upload arbitrary files 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, 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 Thumbnail Slider With Lightbox 1.0 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 Thumbnail Slider With Lightbox the fix is 1.0.1: builds 1.0 are affected, anything from 1.0.1 onward is not.

Remediation

Update to version 1.0.1, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Thumbnail Slider With Lightbox: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Thumbnail Slider With Lightbox 1.0.1 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-5820 https://www.wordfence.com/threat-intel/vulnerabilities/id/e51e1cd2-6de9-4820-8bba-1c6b5053e2c1 https://nvd.nist.gov/vuln/detail/CVE-2023-5820

Related records

Same weakness class

4.3CVE-2023-5531: Thumbnail Slider With Lightbox <= 1.0 CSRFCVE-2023-5531

CVSS Vector

8.3

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

Base

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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