CVE-2024-7423: Xwp Stream CSRF Vulnerability

CVE-2024-7423 Overview

CVE-2024-7423 is a Cross-Site Request Forgery (CSRF) vulnerability in the Stream plugin for WordPress, affecting all versions up to and including 4.0.1. The flaw stems from missing or incorrect nonce validation in the network_options_action() function within classes/class-network.php. Unauthenticated attackers can update arbitrary options on a vulnerable WordPress multisite network by tricking an authenticated administrator into clicking a crafted link. Successful exploitation can lead to denial of service or privilege escalation. The vulnerability is tracked under [CWE-352].

Critical Impact

Attackers can modify arbitrary network options on WordPress multisite installations, enabling privilege escalation or denial of service through forged administrator requests.

Affected Products

• XWP Stream plugin for WordPress, all versions through 4.0.1
• WordPress multisite installations running the affected plugin
• Sites with administrators susceptible to social engineering links

Discovery Timeline

• 2024-09-13 - CVE-2024-7423 published to NVD
• 2024-09-26 - Last updated in NVD database

Technical Details for CVE-2024-7423

Vulnerability Analysis

The Stream plugin tracks user and system activity on WordPress sites and includes network-level option management for multisite deployments. The network_options_action() handler processes requests to update network-wide plugin options but fails to validate a WordPress nonce token before applying changes. This omission removes the CSRF protection that WordPress provides through its wp_verify_nonce() and check_admin_referer() primitives.

Without nonce validation, the handler accepts any authenticated request that reaches the endpoint, regardless of origin. An attacker who hosts a malicious page can embed a request targeting the vulnerable endpoint. When a logged-in network administrator visits that page, their browser submits the request with valid session cookies. The plugin then processes the update as if the administrator initiated it.

The vulnerability requires user interaction, since the administrator must visit attacker-controlled content while authenticated. However, no attacker credentials are needed to initiate the attack chain.

Root Cause

The root cause is the absence of a nonce check in the network_options_action() function in classes/class-network.php. WordPress requires nonce verification on state-changing requests to confirm intent and origin. The vendor patch in changeset 3139815 adds the required validation before option updates are committed.

Attack Vector

Exploitation proceeds over the network and requires no privileges, only user interaction from a targeted administrator. An attacker crafts an HTML page or email containing a hidden form or image tag that triggers a POST request to the vulnerable Stream endpoint. The forged request carries parameters that overwrite arbitrary network options. Depending on the option modified, the attacker can disable security features, redirect site URLs, or alter role capabilities to escalate privileges. Public proof-of-concept exploit code is not currently listed in the references.

Detection Methods for CVE-2024-7423

Indicators of Compromise

• Unexpected modifications to WordPress network options, particularly role, URL, or plugin-related settings
• HTTP POST requests to Stream plugin network admin endpoints lacking a valid _wpnonce parameter
• Administrator account activity originating from external Referer headers pointing to untrusted domains
• New or altered administrator accounts following an administrator browsing session

Detection Strategies

• Audit web server access logs for POST requests targeting wp-admin/network/admin.php with Stream-related action parameters
• Compare current wp_sitemeta and option tables against known-good backups to identify unauthorized changes
• Review Stream plugin activity logs for option-update events that lack corresponding administrator UI sessions

Monitoring Recommendations

• Enable WordPress audit logging at the multisite network level and forward events to a centralized log platform
• Alert on changes to sensitive options such as siteurl, home, active_sitewide_plugins, and user role definitions
• Monitor administrator browser sessions for cross-origin form submissions targeting /wp-admin/ paths

How to Mitigate CVE-2024-7423

Immediate Actions Required

• Update the Stream plugin to a version later than 4.0.1 that includes the fix from changeset 3139815
• Force re-authentication for all network and site administrators after patching
• Review network options and user roles for unauthorized modifications made prior to patching

Patch Information

The vendor addressed the vulnerability in the WordPress Stream Changeset 3139815, which adds nonce validation to network_options_action(). Site operators should install the patched release through the WordPress plugin updater. Technical details are available in the Wordfence Vulnerability Analysis and the original WordPress Stream Class File.

Workarounds

• Deactivate the Stream plugin on multisite networks until the patched version is installed
• Restrict administrator access to the WordPress network admin from trusted IP addresses using web server rules
• Train administrators to log out of WordPress before browsing untrusted links and to use isolated browser profiles for admin tasks

# Update the Stream plugin using WP-CLI
wp plugin update stream --network
wp plugin list --name=stream --fields=name,status,version