CVE-2025-2396: Edetw U-office Force RCE Vulnerability

CVE-2025-2396 Overview

CVE-2025-2396 is an arbitrary file upload vulnerability [CWE-434] in U-Office Force, an office automation product from e-Excellence (edetw). The flaw allows authenticated remote attackers holding only regular user privileges to upload web shell backdoors to the server. Once uploaded, the attacker can invoke the web shell to execute arbitrary code in the context of the web application. Successful exploitation grants full read, write, and execute access to application data and the underlying host. TW-CERT has issued an advisory and an associated incident report, indicating awareness of active interest in this product.

Critical Impact
Authenticated low-privilege users can upload and execute web shells, leading to remote code execution and full server compromise.

Affected Products

e-Excellence (edetw) U-Office Force — all versions prior to the vendor-supplied fix
Deployments exposing the U-Office Force web interface to internal users or the internet
Environments where regular user accounts can be obtained or are broadly provisioned

Discovery Timeline

2025-03-17 - CVE-2025-2396 published to NVD
2025-11-18 - Last updated in NVD database

Technical Details for CVE-2025-2396

Vulnerability Analysis

The vulnerability resides in U-Office Force's file upload handling. The application fails to enforce server-side validation of file type, extension, and content for files submitted by authenticated users. As a result, an attacker can submit a server-executable script, such as a PHP, ASP, or JSP web shell, through a standard upload feature accessible to regular accounts. Because the uploaded file lands inside a directory that the web server is configured to execute, sending an HTTP request to the uploaded file triggers code execution. The attacker then issues arbitrary operating system commands through the web shell interface.

Root Cause

The root cause is unrestricted upload of files with dangerous types, classified as [CWE-434]. U-Office Force does not enforce an allowlist of permitted extensions, validate the file's magic bytes, rename uploaded files to non-executable names, or store them outside the web root. The combination of these missing controls turns a routine document upload feature into a code execution primitive.

Attack Vector

The attack is network-reachable and requires only low-privileged authentication. An attacker authenticates with a standard user account, submits a crafted upload request containing a web shell payload, and then requests the uploaded resource over HTTP. The web server interprets the payload, executing attacker-supplied commands. No user interaction is required, and the attack complexity is low. The vulnerability mechanism is documented in the TW-CERT Security Advisory and the TW-CERT Incident Report. No public proof-of-concept exploit code has been released.

Detection Methods for CVE-2025-2396

Indicators of Compromise

New script files (.php, .jsp, .asp, .aspx) appearing inside U-Office Force upload directories or under the web root
HTTP POST requests to upload endpoints followed shortly by GET requests to attacker-named script files
Web server child processes such as cmd.exe, powershell.exe, /bin/sh, or bash spawned by the U-Office Force application process
Outbound connections from the U-Office Force host to unrecognized infrastructure following an upload event

Detection Strategies

Monitor file integrity on upload destination directories and alert on creation of files with executable extensions
Inspect HTTP access logs for requests to recently created files within upload paths and correlate with the originating session
Apply web application firewall rules that block uploads containing script signatures or polyglot file structures
Hunt for anomalous process lineage where the web server or application server is the parent of a shell or scripting interpreter

Monitoring Recommendations

Centralize U-Office Force application logs, web server access logs, and host process telemetry for correlated analysis
Baseline normal upload activity by user, file type, and size, then alert on deviations
Track authentication events for regular accounts that subsequently perform uploads followed by direct file access

How to Mitigate CVE-2025-2396

Immediate Actions Required

Apply the vendor-supplied update from e-Excellence as referenced in the TW-CERT advisory
Restrict network access to the U-Office Force interface to trusted networks and VPN users until patched
Audit existing upload directories for unauthorized script files and remove any unrecognized artifacts
Rotate credentials for any account that could have been used to authenticate during the exposure window

Patch Information

e-Excellence has issued a fixed version of U-Office Force. Administrators should consult the TW-CERT Security Advisory for the specific fixed build and obtain the update directly from the vendor. After patching, verify that upload handlers reject executable file extensions and that uploaded files are stored outside any directory configured to execute server-side scripts.

Workarounds

Configure the web server to deny script execution within upload directories using .htaccess, IIS request filtering, or equivalent location-based rules
Place a reverse proxy or web application firewall in front of U-Office Force to block uploads with executable extensions and known web shell signatures
Reduce the population of regular user accounts and disable any unused or shared accounts that could be abused to reach the vulnerable upload feature

bash

# Apache example: deny script execution in the U-Office Force uploads directory
<Directory "/var/www/u-office/uploads">
    php_admin_flag engine off
    AddType text/plain .php .phtml .php3 .php4 .php5 .jsp .asp .aspx
    Options -ExecCGI
    <FilesMatch "\.(php|phtml|jsp|asp|aspx|sh|cgi)$">
        Require all denied
    </FilesMatch>
</Directory>