CVE-2023-6812

WP Compress – Image Optimizer [All-In-One] <= 6.20.01 - Open Redirect via css

2024-05-13 00:00
Krzysztof Zając

Strategic Overview

Status
Patched in 6.20.02
Affected Plugin
WP Compress – Instant Performance & Speed Optimization
Affected Version
<= 6.20.01
CVSS
4.3Medium
Weakness type
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
CVE
CVE-2023-6812
View all WP Compress – Instant Performance & Speed Optimization vulnerabilities

At a glance

CVE-2023-6812 is a medium-severity URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the WP Compress WordPress plugin, affecting versions <= 6.20.01. 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 6.20.02; sites on affected versions should update now. Disclosed May 2024, reported by Krzysztof Zając.

Vulnerability Overview

The WP Compress – Image Optimizer [All-In-One plugin for WordPress is vulnerable to Open Redirect in all versions up to, and including, 6.20.01. This is due to insufficient validation on the redirect url supplied via the 'css' parameter. This makes it possible for unauthenticated attackers to redirect users to potentially malicious sites if they can successfully trick them into performing an action.

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-601: URL Redirection to Untrusted Site ('Open Redirect')

WP Compress <= 6.20.01 carries this weakness at css, and reaching it takes a caller who can reach the endpoint. An open redirect is a page that takes a destination from the request and sends the browser there without checking that the destination belongs to the site.

A link that starts on a trusted domain finishes on an attacker's, which is what makes phishing and consent-screen abuse credible to the person clicking it. For WP Compress the fix is 6.20.02: builds <= 6.20.01 are affected, anything from 6.20.02 onward is not.

Remediation

Update to version 6.20.02, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to WP Compress: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WP Compress 6.20.02 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-6812https://www.wordfence.com/threat-intel/vulnerabilities/id/cbbf9fbb-74fd-42eb-a781-2a720fe56b13https://nvd.nist.gov/vuln/detail/CVE-2023-6812

Related records

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