CVE-2024-8410: Abcd-community Abcd Path Traversal Flaw

CVE-2024-8410 Overview

CVE-2024-8410 is a path traversal vulnerability in ABCD ABCD2 versions up to 2.2.0-beta-1, a library management application maintained by the abcd-community project. The flaw resides in /abcd/opac/php/otros_sitios.php and stems from improper handling of the sitio parameter. Remote attackers can manipulate this parameter to traverse directories outside the intended web root. The exploit has been publicly disclosed, and the vendor did not respond to disclosure attempts. The issue is tracked under CWE-22 and carries a CVSS v4.0 score of 5.3.

Critical Impact
Remote attackers with low privileges can read files outside the intended directory scope by manipulating the sitio parameter, exposing configuration or application data.

Affected Products

ABCD ABCD2 version 2.2.0 alpha
ABCD ABCD2 version 2.2.0 beta0
ABCD ABCD2 releases up to and including 2.2.0-beta-1

Discovery Timeline

2024-09-04 - CVE-2024-8410 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-8410

Vulnerability Analysis

The vulnerability affects the OPAC (Online Public Access Catalog) component of ABCD ABCD2. Specifically, the script /abcd/opac/php/otros_sitios.php accepts a user-supplied sitio argument that is used in file path operations without adequate sanitization. Attackers can inject directory traversal sequences such as ../ to escape the intended base directory. The attack is network-reachable, requires only low privileges, and does not need user interaction. Exploitation impacts confidentiality by exposing files readable by the web server process. Integrity and availability are not directly affected according to the CVSS vector.

Root Cause

The root cause is missing validation of the sitio request parameter before it is concatenated into a file system path. The application does not normalize or restrict the resolved path against an allow-list of permitted resources. This constitutes an Improper Limitation of a Pathname to a Restricted Directory weakness, classified as CWE-22.

Attack Vector

An attacker sends a crafted HTTP request to /abcd/opac/php/otros_sitios.php with a sitio parameter containing traversal sequences. Because the endpoint is exposed via the OPAC front-end, no authentication chain is required beyond the low privilege reflected in the CVSS metrics. The exploit has been documented publicly in the ABCD Vulnerabilities repository and cataloged in VulDB entry #276490.

No verified proof-of-concept code is reproduced here. Refer to the referenced advisories for exploitation specifics.

Detection Methods for CVE-2024-8410

Indicators of Compromise

HTTP requests to /abcd/opac/php/otros_sitios.php containing sitio parameter values with ../, ..\, URL-encoded traversal sequences (%2e%2e%2f), or absolute path prefixes.
Web server access logs showing successful responses to otros_sitios.php requests referencing files outside the OPAC directory tree, such as /etc/passwd or PHP configuration files.
Anomalous read access to sensitive configuration files by the web server user account.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect the sitio query parameter for path traversal patterns and reject requests containing directory-escape sequences.
Correlate web access logs with file system audit logs to identify reads of files outside /abcd/opac/ by the web server process.
Baseline normal otros_sitios.php request patterns and alert on deviations in parameter length, encoding, or referenced paths.

Monitoring Recommendations

Enable verbose HTTP request logging on the ABCD web front-end, capturing full query strings for post-incident analysis.
Forward web server and PHP error logs into a centralized SIEM for correlation across sessions and source addresses.
Alert on repeated 200-OK responses to otros_sitios.php from a single source, which may indicate active enumeration of file paths.

How to Mitigate CVE-2024-8410

Immediate Actions Required

Restrict network access to the ABCD OPAC interface, exposing it only to trusted client ranges until a patch is available.
Deploy WAF signatures that block path traversal sequences in requests to /abcd/opac/php/otros_sitios.php.
Audit web server logs for prior exploitation attempts referencing the sitio parameter with traversal characters.

Patch Information

No vendor patch is currently referenced in the CVE record. The vendor was contacted early about the disclosure but did not respond. Monitor the ABCD Vulnerabilities repository and the abcd-community project channels for future fixes. Until an official update is released, apply compensating controls at the web tier.

Workarounds

Add a reverse proxy rule that rejects any request to otros_sitios.php where the sitio parameter contains ., /, \, or URL-encoded equivalents.
Constrain the web server user's file system permissions so that only files within the OPAC directory are readable.
Consider disabling the otros_sitios.php endpoint if the "other sites" feature is not required in your deployment.

bash

# Example NGINX rule to block traversal sequences in the sitio parameter
location = /abcd/opac/php/otros_sitios.php {
    if ($arg_sitio ~* "(\.\./|\.\.\\|%2e%2e|/etc/|/proc/)") {
        return 403;
    }
    proxy_pass http://abcd_backend;
}