External risk intelligence

OpenDocMan 1.4.4 MIME-Bypass Arbitrary File Upload Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2021-45834

OpenDocMan is a document management system designed as a web-based portal. Such applications are commonly deployed as web-facing services accessible to users over the internet to facilitate file management and collaboration, making the interface and associated file upload functionality typically exposed to external network traffic.

Unrestricted File Upload

Opendocman

1.4.4

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

This advisory concerns a critical vulnerability in OpenDocMan's document management portal that allows unauthenticated attackers to upload dangerous file types. If exploited, this could potentially lead to the execution of arbitrary code within the product's environment. The primary concern is to confirm if this specific software is in use and exposed externally.

  • Attackers can upload harmful files.
  • Matters if document portals are publicly accessible.
  • Confirm usage and exposure of this system.

Attack Path

How an attacker could exploit the issue

An attacker can upload malicious files to the OpenDocMan portal through its file transfer feature, bypassing security checks. This could allow the attacker to execute arbitrary code on the server, leading to a complete compromise of the system.

  • Unauthenticated access to the portal.
  • Uploading dangerous file types via add.php.
  • Potential for arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

An attacker could upload malicious files to the OpenDocMan portal, which, when processed, may lead to the execution of arbitrary code. This could occur when the system handles uploaded files through its `add.php` script via a MIME-bypass technique.

  • Dangerous file types may be uploaded.
  • Malicious files could be processed by the portal.
  • Arbitrary code execution could occur.

Operational Fix

Recommended remediation, mitigation, and detection steps

The OpenDocMan portal's file upload vulnerability, accessible via `add.php`, likely falls under the responsibility of application owners and the infrastructure or platform teams managing the web services. The initial practical step is to identify all instances of OpenDocMan, confirm their reachability and business criticality, and then determine the accountable owner for remediation planning.

  • App owners and platform teams are responsible.
  • Verify OpenDocMan's external exposure.
  • Plan remediation with vendor coordination.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is OpenDocMan?

OpenDocMan is an open-source, web-based document management system. It provides a centralized portal for organizations to store, track, and collaborate on files. Because it is designed to be a functional web interface, it is commonly installed on servers where users can access it through a browser to manage their document libraries.

What does CWE-434 mean regarding CVE-2021-45834?

CWE-434 refers to an Unrestricted Upload of File with Dangerous Type. In the context of this CVE, it means the application fails to properly validate the files being uploaded. Instead of limiting uploads to safe documents, the system allows an attacker to bypass checks and submit executable files that the server might then incorrectly process or run.

How can an attacker trigger this vulnerability?

An attacker triggers this by targeting the 'add.php' file within the OpenDocMan portal. By using a technique known as a MIME-bypass, they trick the system into accepting dangerous file types that should have been rejected. Simply browsing the site or uploading legitimate documents does not trigger this; the bug requires specifically crafted file upload requests that evade the portal's intended security controls.

Is my instance of OpenDocMan at risk?

According to Halo Surface Signal, this software is often deployed as a web-facing service to facilitate remote file management, meaning instances are frequently reachable from the internet. If your specific deployment is exposed to external network traffic, it is at higher risk because attackers do not need prior authentication to attempt the malicious file upload.

What should I do if I run OpenDocMan 1.4.4?

Your first step is to locate all instances of OpenDocMan 1.4.4 within your environment to understand your footprint. Once identified, confirm if these systems are accessible from the internet. Coordinate with the application owners or your platform team to evaluate the business necessity of the current configuration and prioritize this for remediation or security updates provided by the vendor.

References