External risk intelligence

elFinder 2.1.64 Improper Access Control File Upload Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2024-38909

elFinder is a file manager component typically integrated into web applications to provide users with interface-based file management capabilities. Because it is designed to be a functional web-based UI for users to interact with server-side files, it is commonly exposed as part of internet-facing web applications or administrative panels.

Std42 Elfinder

2.1.64

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

Studio 42's elFinder, a web-based file management tool, has a critical vulnerability where unauthorized users could potentially gain access to sensitive information or execute code. This issue stems from improper controls over file copying operations, allowing attackers to bypass intended restrictions.

File manager allows unauthorized file access.
Critical flaw could expose sensitive data.
Confirm relevance; ensure no exposure.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by accessing a web server that uses the affected file manager component. If the file manager allows copying files between directories without proper checks on file extensions, an attacker can leverage this to move sensitive files or execute arbitrary code on the server.

Entry: Unauthenticated network access.
Trigger: Unauthorized file copying across directories.
Risk: Exposure of secrets, arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthorized attacker to access and potentially execute arbitrary code on the server. When supported by the advisory, this could involve copying files with specific, unauthorized extensions between directories, leading to exposure of sensitive information or compromise of the system's behavior.

Server files and secrets at risk.
Unauthorized file copying.
Potential for RCE and data exposure.

Operational Fix

Recommended remediation, mitigation, and detection steps

Application owners and web infrastructure teams are likely responsible for addressing this vulnerability in elFinder. The immediate first step is to identify all instances of the affected file manager component, determine its reachability and criticality within the environment, and then confirm the accountable owner for remediation. Subsequent actions will depend on the assessed risk and available maintenance windows.

Application owners should assume responsibility.
Verify component exposure and business criticality.
Plan remediation based on assessed risk.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is elFinder?

elFinder is a web-based file management component developed by Studio 42. It functions like a graphical file explorer integrated directly into web applications, allowing users to upload, edit, and organize files on a server through a browser interface. Because it simplifies complex server-side file operations, developers often include it in administrative panels or user dashboards to provide a familiar desktop-like experience for managing web-hosted content.

What does CVE-2024-38909 mean for security?

This vulnerability is classified as an Incorrect Access Control issue (CWE-284). It represents a failure in the software's permission logic, specifically regarding file operations. Because the system does not properly validate file extensions during move or copy actions, it creates a shortcut that allows users to bypass security boundaries, potentially leading to unauthorized data access or the execution of malicious commands on the host server.

How is this elFinder bug triggered?

The bug is triggered when an attacker interacts with the file manager to copy or move files between server directories without proper validation. The vulnerability specifically arises from the software's failure to enforce restrictions on unauthorized file extensions during these transfers. Note that simply viewing files or accessing directories is not the trigger; the exploitation requires performing these specific, improperly validated file movement operations.

Why should I care about this CVE based on Halo Surface Signal?

Halo Surface Signal indicates that because elFinder is a functional web-based UI designed for interactive file management, it is frequently integrated into internet-facing applications or administrative panels. This high level of connectivity means that if your instance is reachable from the public internet, it is more likely to be accessible to arbitrary, unauthenticated attackers, significantly increasing the potential risk to your server.

How do I respond to CVE-2024-38909?

Your first step is to locate all deployments of elFinder 2.1.64 within your web environment. Once identified, evaluate whether these components are internet-facing or isolated within internal networks to prioritize your response. Assign ownership to the relevant application teams and confirm the business criticality of each instance. From there, coordinate with your infrastructure or development leads to plan remediation according to your organization's established maintenance procedures.

References

github.com/B0D0B0P0T/CVE/blob/main/CVE-2024-38909

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.