CVE-2023-41732

CP Blocks <= 1.0.20 - Cross-Site Request Forgery to Settings Update

2023-09-05 00:00

Strategic Overview

Status: Patched in 1.0.21
Affected Plugin: CP Blocks
Affected Version: <= 1.0.20
CVSS: 4.3Medium
Weakness type: CWE-352 · Cross-Site Request Forgery (CSRF)
CVE: CVE-2023-41732

At a glance

CVE-2023-41732 is a medium-severity Cross-Site Request Forgery (CSRF) vulnerability in the CP Blocks WordPress plugin, affecting versions <= 1.0.20. 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 1.0.21; sites on affected versions should update now. Disclosed September 2023, reported by István Márton.

Vulnerability Overview

The CP Blocks plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.0.20. This is due to incorrect nonce validation in the admin-int-license.inc.php file. This makes it possible for unauthenticated attackers to update the license key 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)

Reaching this weakness in CP Blocks <= 1.0.20 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 CP Blocks the fix is 1.0.21: builds <= 1.0.20 are affected, anything from 1.0.21 onward is not.

Remediation

Update to version 1.0.21, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to CP Blocks: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: CP Blocks 1.0.21 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-41732 https://www.wordfence.com/threat-intel/vulnerabilities/id/35cd1788-1756-4d03-8f6f-e5e4153e3f4f https://nvd.nist.gov/vuln/detail/CVE-2023-41732

Related records

Other vulnerabilities in CP Blocks

6.4CVE-2022-0448: CP Blocks <= 1.0.14 Stored Cross-Site ScriptingCVE-2022-0448

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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