CVE-2024-4593: DedeCMS CSRF Vulnerability in sys_multiserv

CVE-2024-4593 Overview

CVE-2024-4593 is a cross-site request forgery (CSRF) vulnerability in DedeCMS 5.7, a Chinese open-source content management system. The flaw resides in /src/dede/sys_multiserv.php and allows attackers to trigger state-changing requests when an authenticated administrator visits a crafted page. The weakness is tracked as [CWE-352] and was assigned VulDB identifier VDB-263315. The exploit has been publicly disclosed. According to the disclosure, the vendor was contacted prior to publication but did not respond.

Critical Impact

Remote attackers can trick authenticated DedeCMS administrators into executing unauthorized actions through the vulnerable sys_multiserv.php endpoint, affecting integrity of the CMS configuration.

Affected Products

• DedeCMS 5.7
• Component: /src/dede/sys_multiserv.php
• Vendor: dedecms

Discovery Timeline

• 2024-05-07 - CVE-2024-4593 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-4593

Vulnerability Analysis

The vulnerability stems from missing anti-CSRF protections on the sys_multiserv.php administrative endpoint in DedeCMS 5.7. The script processes requests without validating a per-session token tied to the submitting user. An attacker who can lure an authenticated administrator to a malicious page can forge requests that the browser automatically authenticates using existing session cookies.

The attack targets confidentiality and integrity at a limited scope and requires user interaction, consistent with classic CSRF patterns. Exploitation does not require attacker-side credentials because the victim's browser supplies them implicitly.

Root Cause

The root cause is the absence of a CSRF token, origin check, or SameSite cookie enforcement on state-changing requests handled by sys_multiserv.php. Any request from an authenticated administrator session is accepted as legitimate.

Attack Vector

The attack is initiated remotely over the network. An attacker hosts a page containing a hidden form or img/script tag that targets the vulnerable endpoint on the victim's DedeCMS instance. When the authenticated administrator loads the page, the browser issues the forged request with valid session cookies, and the server executes it. Public proof-of-concept details are referenced in the GitHub CMS Documentation and the VulDB entry.

Detection Methods for CVE-2024-4593

Indicators of Compromise

• Unexpected modifications to multi-server configuration entries managed by sys_multiserv.php.
• Administrator session requests to /src/dede/sys_multiserv.php with HTTP Referer or Origin headers pointing to third-party domains.
• Short-interval POST requests to the endpoint shortly after an admin visits an external link.

Detection Strategies

• Inspect web server access logs for POST requests to sys_multiserv.php where Referer is absent or external.
• Alert on administrative state changes that lack a corresponding interactive admin UI navigation sequence.
• Deploy a web application firewall (WAF) rule that enforces same-origin Referer/Origin validation for /src/dede/* paths.

Monitoring Recommendations

• Monitor DedeCMS administrator accounts for configuration changes outside maintenance windows.
• Correlate browser and endpoint telemetry with CMS audit logs to identify requests triggered without direct admin interaction.
• Track outbound email or notification events generated by multi-server configuration changes to spot unauthorized modifications early.

How to Mitigate CVE-2024-4593

Immediate Actions Required

• Restrict access to /src/dede/ to trusted IP ranges or require VPN access for the administration backend.
• Instruct administrators to log out of the DedeCMS backend before browsing other sites and to use dedicated browsers or profiles for administration.
• Deploy WAF rules that enforce Origin and Referer header checks on all state-changing admin endpoints.

Patch Information

At the time of publication, no vendor patch is available. The disclosure notes the vendor did not respond to pre-disclosure contact. Monitor the VulDB entry and GitHub CMS Documentation for remediation updates.

Workarounds

• Set session cookies for the DedeCMS admin interface to SameSite=Strict to block cross-site request forwarding.
• Add a reverse proxy or WAF rule rejecting requests to sys_multiserv.php without a same-origin Referer.
• Implement a custom pre-filter in /src/dede/ that validates a per-session CSRF token on every POST request.

# Example nginx configuration enforcing same-origin Referer on the admin path
location ~ ^/src/dede/sys_multiserv\.php$ {
    valid_referers server_names;
    if ($invalid_referer) {
        return 403;
    }
    include fastcgi_params;
    fastcgi_pass unix:/var/run/php-fpm.sock;
}