CVE-2025-9846: Inka.Net RCE Vulnerability

CVE-2025-9846 Overview

CVE-2025-9846 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) in TalentSys Consulting Information Technology Industry Inc. Inka.Net that allows Command Injection. This vulnerability enables remote attackers to upload malicious files without proper validation, which can then be leveraged to execute arbitrary commands on the target system.

Critical Impact

This vulnerability allows unauthenticated remote attackers to upload dangerous file types and achieve command injection, potentially leading to complete system compromise with impacts on confidentiality, integrity, and availability extending beyond the vulnerable component.

Affected Products

• TalentSys Consulting Information Technology Industry Inc. Inka.Net versions prior to 6.7.1

Discovery Timeline

• 2025-09-23 - CVE CVE-2025-9846 published to NVD
• 2025-09-24 - Last updated in NVD database

Technical Details for CVE-2025-9846

Vulnerability Analysis

This vulnerability stems from insufficient file upload validation in the Inka.Net application. The application fails to properly restrict the types of files that can be uploaded, allowing attackers to submit files with dangerous extensions or content types. Once uploaded, these malicious files can be leveraged to execute arbitrary commands on the underlying server.

The vulnerability is particularly severe because it requires no authentication and no user interaction to exploit. Attackers can remotely target the application over the network, and successful exploitation can impact resources beyond the vulnerable component itself, indicating a changed scope in the attack's potential reach.

Root Cause

The root cause is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type). The application lacks proper validation mechanisms to verify:

• File extension restrictions
• MIME type validation
• File content inspection
• Filename sanitization

This allows attackers to bypass intended security controls and upload executable scripts, web shells, or other dangerous file types that can be used to execute commands on the server.

Attack Vector

The attack vector is network-based with low complexity. An attacker can exploit this vulnerability by:

1. Identifying file upload functionality within the Inka.Net application
2. Crafting a malicious file containing command injection payloads (e.g., a web shell or script)
3. Uploading the malicious file by bypassing or abusing the inadequate file type restrictions
4. Accessing or triggering the uploaded file to execute arbitrary commands on the server

The vulnerability allows for command injection, meaning attackers can execute system-level commands with the privileges of the web application user, potentially leading to full server compromise.

For technical details on exploitation techniques, refer to the USOM Security Notification TR-25-0288.

Detection Methods for CVE-2025-9846

Indicators of Compromise

• Unusual file uploads with executable extensions (.php, .asp, .aspx, .jsp, .sh, .exe) to web-accessible directories
• Web server logs showing POST requests to upload endpoints followed by GET requests to newly created files
• Unexpected outbound network connections originating from web server processes
• New or modified files in upload directories with suspicious content or timestamps
• Process execution anomalies where web server processes spawn shell commands

Detection Strategies

• Monitor file upload directories for newly created files with executable or script extensions
• Implement file integrity monitoring on web-accessible directories to detect unauthorized file creation
• Analyze web application logs for suspicious upload patterns and subsequent file access attempts
• Deploy web application firewall (WAF) rules to inspect uploaded file content for malicious payloads
• Enable command execution logging on servers to detect post-exploitation activity

Monitoring Recommendations

• Configure real-time alerts for file creation events in upload directories
• Implement network traffic analysis to detect command and control (C2) communications
• Monitor for anomalous process trees where web server processes spawn system shells
• Review authentication and access logs for unusual patterns following upload activity

How to Mitigate CVE-2025-9846

Immediate Actions Required

• Upgrade Inka.Net to version 6.7.1 or later immediately
• Audit existing upload directories for any suspicious or malicious files
• Implement strict file upload validation including whitelist-based extension filtering
• Restrict file upload functionality to authenticated users where possible
• Deploy web application firewall rules to block dangerous file type uploads

Patch Information

TalentSys Consulting Information Technology Industry Inc. has addressed this vulnerability in Inka.Net version 6.7.1. Organizations should upgrade to this version or later to remediate the vulnerability. For additional details, refer to the USOM Security Notification TR-25-0288.

Workarounds

• Implement server-side file type validation using content-based inspection rather than relying solely on file extensions
• Store uploaded files outside of the web root directory to prevent direct execution
• Remove execute permissions from upload directories at the filesystem level
• Configure the web server to serve uploaded files with Content-Disposition: attachment headers
• Apply network segmentation to limit the impact of potential server compromise

# Configuration example - Restrict execute permissions on upload directory
chmod -R 644 /var/www/uploads/
chown -R www-data:www-data /var/www/uploads/

# Apache configuration to prevent script execution in uploads directory
# Add to .htaccess or httpd.conf
<Directory "/var/www/uploads">
    Options -ExecCGI -Indexes
    AllowOverride None
    RemoveHandler .php .phtml .php3 .php4 .php5 .php7 .phps
    php_admin_flag engine off
</Directory>