ARMBot Unrestricted File Upload via upload.php

The primary impact of CVE-2019-25480 is the potential for remote code execution (RCE). An attacker can leverage this vulnerability to upload a malicious PHP script, typically by crafting a file name that includes path traversal sequences (e.g., ../public_html/malicious.php). Upon successful upload, the attacker can execute arbitrary code on the server, gaining complete control over the affected system. This could lead to data breaches, system compromise, and further lateral movement within the network. The blast radius extends to any data stored on the server and any connected systems accessible from the compromised ARMBot instance.

Organizations using ARMBot in production environments, particularly those with publicly accessible upload functionalities, are at significant risk. Shared hosting environments where multiple users share the same server are especially vulnerable, as a compromise of one user's account could potentially lead to the compromise of the entire server.

• php: Examine web server access logs for POST requests to upload.php with suspicious file names containing path traversal sequences (e.g., ../public_html/).

grep 'upload.php.*../public_html/' /var/log/apache2/access.log

• php: Check the /public_html/ directory for newly created PHP files with unusual names or timestamps.

find /public_html/ -name '*.php' -type f -mtime -1

• generic web: Monitor file integrity for core ARMBot files, particularly those related to file handling and upload functionality. Unexpected modifications could indicate compromise. • generic web: Review web server error logs for any errors related to file uploads or path traversal attempts.

1. 2026-03-11Disclosure

   disclosure

1. Reserviert2026-02-23
2. Veröffentlicht2026-03-11
3. Geändert2026-04-07
4. EPSS aktualisiert2026-03-23

The most effective mitigation for CVE-2019-25480 is to upgrade to a patched version of ARMBot as soon as it becomes available. In the absence of a patch, implement immediate workarounds. A Web Application Firewall (WAF) can be configured to block requests containing suspicious file names or path traversal sequences. Strict file type validation should be enforced on the server-side, rejecting any files that are not explicitly allowed. Additionally, review and restrict file permissions to prevent uploaded files from being executed. Regularly scan the web root for unauthorized files.