CVE-2025-27724: Meddream PACS Privilege Escalation Flaw

CVE-2025-27724 Overview

A privilege escalation vulnerability exists in the login.php functionality of MedDream PACS Premium 7.3.3.840. This vulnerability allows an attacker to upload a specially crafted .php file that leads to elevated capabilities on the target system. As a medical imaging system, MedDream PACS servers typically process and store sensitive patient health information, making this vulnerability particularly concerning for healthcare organizations.

Critical Impact

Unauthenticated attackers can exploit this vulnerability remotely to gain elevated privileges on MedDream PACS servers, potentially compromising patient data and medical imaging infrastructure.

Affected Products

• MedDream PACS Premium 7.3.3.840
• MedDream PACS Server 7.3.2.840 Premium Edition
• meddream pacs_server

Discovery Timeline

• 2025-07-28 - CVE-2025-27724 published to NVD
• 2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-27724

Vulnerability Analysis

This privilege escalation vulnerability is classified under CWE-284 (Improper Access Control), indicating that the login.php component fails to properly restrict access to critical functionality. The vulnerability exists within the file upload mechanism associated with the login functionality, where insufficient validation allows attackers to upload malicious PHP files that execute with elevated privileges.

The attack can be conducted remotely over the network without requiring any prior authentication or user interaction, making it highly accessible to potential attackers. Successful exploitation results in complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of this vulnerability lies in improper access control mechanisms within the login.php functionality. The application fails to adequately validate and restrict file uploads, allowing PHP files to be uploaded and potentially executed in a privileged context. This lack of proper input validation and access control on the file upload functionality creates an avenue for privilege escalation.

Attack Vector

The attack vector is network-based, allowing remote exploitation without authentication. An attacker can craft a malicious .php file and upload it through the vulnerable login.php endpoint. Once uploaded, the malicious file can be executed to gain elevated capabilities on the target system.

The exploitation flow involves:

1. Identifying a vulnerable MedDream PACS Premium installation exposed to the network
2. Crafting a malicious PHP file designed to execute arbitrary commands or escalate privileges
3. Uploading the file through the login.php functionality that lacks proper validation
4. Triggering execution of the uploaded malicious PHP file to achieve privilege escalation

For detailed technical analysis, refer to the Talos Intelligence Vulnerability Report.

Detection Methods for CVE-2025-27724

Indicators of Compromise

• Unexpected .php files appearing in web-accessible directories on MedDream PACS servers
• Anomalous HTTP POST requests to login.php containing file upload data with PHP extensions
• Web server logs showing successful uploads followed by requests to unfamiliar PHP endpoints
• Unusual process spawning from the web server process (e.g., php-fpm, apache, nginx)

Detection Strategies

• Monitor web server access logs for suspicious file upload attempts to login.php endpoints
• Implement file integrity monitoring on MedDream PACS web directories to detect unauthorized PHP file creation
• Deploy web application firewalls (WAF) with rules to detect malicious PHP file upload attempts
• Review authentication logs for anomalous privilege escalation events following file upload activity

Monitoring Recommendations

• Enable verbose logging on MedDream PACS servers and forward logs to a centralized SIEM platform
• Configure alerts for any new PHP file creation in the application's web directories
• Monitor outbound network connections from the PACS server for potential command and control activity
• Implement network segmentation monitoring to detect lateral movement from compromised PACS servers

How to Mitigate CVE-2025-27724

Immediate Actions Required

• Restrict network access to MedDream PACS servers to only authorized medical imaging systems and personnel
• Implement web application firewall rules to block file uploads with PHP extensions to login.php
• Review and remove any unauthorized PHP files from the MedDream PACS web directories
• Enable enhanced logging and monitoring on affected systems until patches can be applied

Patch Information

At the time of publication, no vendor advisory or official patch information was available in the CVE data. Organizations should contact MedDream directly for patch availability and remediation guidance. Monitor the Talos Intelligence Vulnerability Report for updates on official fixes.

Workarounds

• Implement strict network segmentation to isolate MedDream PACS servers from untrusted networks
• Configure web server to disable PHP execution in upload directories if possible
• Deploy a reverse proxy with strict request filtering to block suspicious file upload attempts
• Implement IP allowlisting to restrict access to the PACS server login functionality

# Example: Restrict access to login.php via .htaccess (Apache)
<Files "login.php">
    Require ip 10.0.0.0/8
    Require ip 192.168.0.0/16
</Files>

# Example: Block PHP file uploads in nginx configuration
location ~* \.php$ {
    if ($request_method = POST) {
        set $block_upload 1;
    }
    if ($content_type ~* "multipart/form-data") {
        set $block_upload "${block_upload}1";
    }
    if ($block_upload = 11) {
        return 403;
    }
}