The Contact Form 7 plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient file type validation in the 'validate' function and insufficient blocklisting on the 'wpcf7_antiscript_file_name' function in versions up to, and including, 5.8.3. This makes it possible for authenticated attackers with editor-level capabilities or above to upload arbitrary files on the affected site's server, but due to the htaccess configuration, remote code cannot be executed in most cases. By default, the file will be deleted from the server immediately. However, in some cases, other plugins may make it possible for the file to live on the server longer. This can make remote code execution possible when combined with another vulnerability, such as local file inclusion.
Given the potential for attackers to exploit this vulnerability, organizations using the Contact Form 7 plugin should prioritize patching immediately. The CVSS score of 6.6 indicates a medium severity level, highlighting the need for prompt remediation to prevent unauthorized file uploads and potential subsequent exploits.
The vulnerability was published on December 1, 2023, and affects all versions prior to 5.8.4 of the Contact Form 7 plugin. Security teams should assess their deployment to understand the impact and take the necessary actions.
Organizations may also consider reviewing their security configurations and employing additional measures to mitigate risks associated with arbitrary file uploads.
The urgency for defenders is high, given the nature of the vulnerability and its potential exploitation paths.
Vulnerability Details
Official CVE description states that the Contact Form 7 plugin is vulnerable to arbitrary file uploads, which is classified under CWE-434. The CVSS score from NVD is 7.2, indicating a high severity rating based on the attack vector, complexity, and required privileges.
The affected versions include all prior to version 5.8.4. This vulnerability's root cause lies in the insufficient validation processes that allow for unauthorized file uploads.
Technical Analysis
The attack vector for this vulnerability is through the network, requiring a high level of privileges for exploitation. Specifically, authenticated users with editor-level capabilities can leverage this flaw. The attack complexity is rated as high, and no user interaction is necessary for exploitation. The impacts on confidentiality, integrity, and availability are all assessed as high.
Risk & Impact Analysis
Risk to organizations includes the potential for unauthorized file uploads, which could lead to further exploitation paths if combined with other vulnerabilities. The blast radius could be significant if sensitive data is exposed or if remote code execution is achieved through additional vulnerabilities.
Given the CVSS score of 7.2, the urgency for organizations to address this vulnerability is high. The potential for exploitation underscores the importance of immediate remediation efforts.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch 5.8.4 of the Contact Form 7 plugin are affected by this vulnerability.
Mitigation & Remediation
Organizations should upgrade to version 5.8.4 of the Contact Form 7 plugin to mitigate this vulnerability. If patching is not immediately possible, consider implementing strict file type validation and reviewing other installed plugins that may interact with file uploads.
For further information on effective security practices, organizations can refer to our continuous penetration testing services.
Detection Guidance
To detect potential exploitation, monitor logs for unauthorized file uploads and any changes in the configuration of the Contact Form 7 plugin. Look for unusual patterns in file storage locations.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential to enable further attacks when combined with local file inclusion vulnerabilities. It highlights the importance of robust input validation across all plugins.
Security teams should learn from this incident to improve their vigilance in monitoring plugin updates and vulnerabilities. Strategic defensive takeaways include ensuring that plugins are regularly reviewed for security compliance.
For additional insights, organizations can explore our vulnerability management program and the importance of continuous security assessments.
Additionally, our penetration testing methodology provides strategies to enhance your security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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