CVE-2024-3685: DedeCMS SQL Injection Vulnerability

CVE-2024-3685 Overview

CVE-2024-3685 is a SQL injection vulnerability in DedeCMS 5.7.112-UTF8, a Chinese-language content management system. The flaw resides in the stepselect_main.php script, where the ids parameter is concatenated into a database query without proper sanitization. Remote attackers can exploit the issue without authentication or user interaction. The vulnerability is tracked as VulDB identifier VDB-260472 and is classified under [CWE-89]. Public exploit details have been disclosed, and the vendor did not respond to early disclosure attempts.

Critical Impact

Unauthenticated remote attackers can manipulate the ids parameter to execute arbitrary SQL statements, potentially exposing or modifying the entire DedeCMS database.

Affected Products

• DedeCMS 5.7.112-UTF8
• stepselect_main.php component
• Deployments exposing DedeCMS administrative endpoints to untrusted networks

Discovery Timeline

• 2024-04-12 - CVE-2024-3685 published to the National Vulnerability Database (NVD)
• 2025-04-08 - Last updated in the NVD database

Technical Details for CVE-2024-3685

Vulnerability Analysis

The vulnerability is a classic SQL injection flaw mapped to [CWE-89]. DedeCMS 5.7.112-UTF8 accepts the ids argument in stepselect_main.php and incorporates it directly into a backend SQL query. Because the input is not validated, escaped, or parameterized, attackers can append additional SQL syntax to alter query semantics. Exploitation requires no privileges and no user interaction, and the attack is delivered over the network. Successful exploitation allows extraction of credentials, modification of CMS content, and potentially full database compromise.

Root Cause

The root cause is the absence of input validation and prepared statements when handling the ids parameter. DedeCMS concatenates the user-supplied value into a SQL statement processed by the underlying MySQL backend. Any single quote, comment sequence, or UNION clause supplied by the attacker is interpreted as SQL syntax rather than data.

Attack Vector

An attacker sends a crafted HTTP request to the stepselect_main.php endpoint with a malicious ids value. The injected payload can use boolean-based, time-based, or UNION-based techniques to read arbitrary tables, including dede_admin, where administrator password hashes are stored. Detailed proof-of-concept material has been published in the GitHub CVE PoC Document and indexed by VulDB #260472.

No verified exploit code is reproduced here. Refer to the linked advisory for technical reproduction details.

Detection Methods for CVE-2024-3685

Indicators of Compromise

• HTTP requests to stepselect_main.php containing SQL metacharacters in the ids parameter such as ', --, UNION SELECT, or SLEEP(
• Web server access logs showing unusually long ids values or hex-encoded payloads
• Unexpected outbound database queries against dede_admin, dede_member, or other sensitive tables
• New or modified administrator accounts in the DedeCMS backend without an audit trail

Detection Strategies

• Deploy web application firewall (WAF) signatures that flag SQL injection patterns targeting stepselect_main.php
• Enable MySQL general query logging during incident investigations to correlate suspicious queries with web requests
• Hunt for repeated requests from a single source IP that vary only the ids parameter, indicating automated probing

Monitoring Recommendations

• Forward web server, application, and database logs to a centralized analytics platform for correlation
• Alert on HTTP 500 responses originating from stepselect_main.php, which often indicate SQL syntax errors caused by injection attempts
• Monitor authentication events for the DedeCMS admin panel and flag logins from new geographies or user agents

How to Mitigate CVE-2024-3685

Immediate Actions Required

• Restrict network access to stepselect_main.php and the DedeCMS administrative directory using IP allowlists or VPN-only access
• Place the DedeCMS application behind a WAF with SQL injection rules enabled in blocking mode
• Audit the dede_admin table for unauthorized accounts and rotate all administrator credentials
• Review web server logs for evidence of exploitation dating back to April 2024

Patch Information

No vendor patch is available. According to the NVD entry, the DedeCMS maintainers were contacted prior to disclosure but did not respond. Organizations should evaluate whether continued use of DedeCMS 5.7.112-UTF8 is acceptable given the lack of vendor remediation, and consider migrating to an actively maintained CMS.

Workarounds

• Apply a virtual patch at the WAF layer that rejects requests where the ids parameter contains non-numeric characters
• Modify stepselect_main.php locally to cast ids values to integers before passing them to the database layer
• Disable or remove the stepselect_main.php script if the functionality is not required in your deployment
• Enforce least-privilege database accounts so the CMS cannot read administrative tables or write outside its own schema

# Example WAF rule (ModSecurity) to block non-numeric ids values
SecRule ARGS:ids "!@rx ^[0-9,]+$" \
    "id:1003685,phase:2,deny,status:403,\
     msg:'CVE-2024-3685 DedeCMS stepselect_main.php ids SQLi attempt'"