Code Injection in DedeCMS via Column Name Parameter

Executive Summary

This vulnerability is a Remote Code Execution (RCE) flaw found in DedeCMS version 5.7.118. It arises from a security issue in the column name cache file writing mechanism within the /plus/search.php file of the Column Management component. By manipulating the 'Column Name' argument, an attacker can inject malicious code that gets written to a cache file and executed remotely.

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Detection Guidance

Detection of this vulnerability involves monitoring for unusual requests targeting the /plus/search.php file, specifically those manipulating the Column Name argument to inject code.

You can use network monitoring tools or web server logs to identify suspicious HTTP requests that include unexpected parameters or payloads in the Column Name argument.

For example, using command line tools like grep on your web server logs to find requests to /plus/search.php with suspicious parameters:

• grep "/plus/search.php" /path/to/access.log | grep -i "ColumnName"

Additionally, monitoring for newly created or modified cache files related to column names might help detect exploitation attempts.

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Impact Analysis

An attacker exploiting this vulnerability can execute arbitrary code on the affected system remotely. This can lead to a full system compromise, allowing the attacker to take control over the server running DedeCMS, potentially leading to data theft, service disruption, or further attacks within the network.

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Compliance Impact

This vulnerability in DedeCMS 5.7.118, which allows remote code execution via manipulation of the Column Name parameter, can have significant implications for compliance with standards and regulations like GDPR and HIPAA.

• GDPR: The vulnerability could lead to unauthorized access to sensitive personal data stored or processed by the CMS. Under GDPR, organizations must implement appropriate technical measures to protect personal data. A successful exploit of this vulnerability could result in a data breach, triggering mandatory reporting requirements and potential fines if the organization is found to have inadequate security measures.
• HIPAA: For organizations handling protected health information (PHI), this vulnerability poses a risk of unauthorized access or disclosure of PHI. HIPAA requires covered entities to ensure the confidentiality, integrity, and availability of PHI. Exploitation of this vulnerability could lead to violations of the Security Rule, resulting in penalties and corrective action plans.
• General compliance impact: The vulnerability's public exploit availability increases the risk of attacks, which may violate requirements in other standards (e.g., ISO 27001, NIST) that mandate secure coding practices, vulnerability management, and protection against unauthorized access. Organizations may need to demonstrate due diligence in patching or mitigating the issue to avoid compliance violations.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable /plus/search.php endpoint, especially from untrusted networks.

Applying input validation and sanitization on the Column Name argument to prevent code injection is critical.

If possible, update DedeCMS to a version where this vulnerability is patched.

As a temporary measure, monitor and block suspicious requests targeting the vulnerable component and review file system changes related to cache files.

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