CVE-2025-8306: Asseco InfoMedica Privilege Escalation Flaw

CVE-2025-8306 Overview

CVE-2025-8306 is an Insufficient Granularity of Access Control vulnerability (CWE-1220) affecting Asseco InfoMedica, a comprehensive healthcare management solution used for administrative and medical tasks in the healthcare sector. The vulnerability allows a low-privileged user to obtain encoded passwords of all other accounts, including the main administrator account, due to inadequate access control granularity.

Critical Impact

Low-privileged attackers on an adjacent network can extract encoded credentials for all system users, including administrators. When chained with CVE-2025-8307, this vulnerability enables full privilege escalation in healthcare management systems.

Affected Products

• Asseco InfoMedica versions prior to 4.50.1
• Asseco InfoMedica versions prior to 5.38.0

Discovery Timeline

• 2026-01-08 - CVE-2025-8306 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-8306

Vulnerability Analysis

This vulnerability stems from CWE-1220: Insufficient Granularity of Access Control, where the application fails to implement fine-grained access restrictions on sensitive credential data. In Asseco InfoMedica, the access control mechanism does not properly differentiate between privilege levels when users request account information.

A low-privileged user can leverage this flaw to retrieve encoded passwords belonging to other accounts within the system. The vulnerability is particularly concerning in healthcare environments where InfoMedica manages both administrative and medical workflows, potentially exposing sensitive patient data management systems to unauthorized access.

The attack requires adjacent network access, meaning an attacker must be on the same network segment as the vulnerable application. While the passwords are obtained in encoded form, this still represents a significant security risk as encoded credentials may be subject to offline decoding or replay attacks.

Root Cause

The root cause lies in the insufficient access control granularity within the user account management functionality of Asseco InfoMedica. The application does not properly restrict data retrieval operations based on user privilege levels, allowing any authenticated user to access credential data that should only be available to system administrators.

This design flaw represents a fundamental gap in the principle of least privilege, where the system fails to limit users to only the information necessary for their role.

Attack Vector

The attack requires adjacent network positioning and low-privilege authentication to the InfoMedica system. An attacker with valid but limited user credentials can exploit the insufficient access controls to enumerate and retrieve encoded password hashes for all accounts in the system.

The attack flow involves:

1. Authenticating to the InfoMedica system with low-privilege credentials
2. Accessing the vulnerable endpoint or functionality that exposes account data
3. Retrieving encoded passwords for all users, including administrative accounts
4. Optionally chaining with CVE-2025-8307 to achieve privilege escalation

For detailed technical analysis, see the CERT-PL security advisory.

Detection Methods for CVE-2025-8306

Indicators of Compromise

• Unusual account enumeration requests from low-privileged user sessions
• Access patterns showing non-administrative users querying administrator account details
• Anomalous credential data retrieval from user management endpoints
• Correlation of CVE-2025-8306 exploitation with CVE-2025-8307 privilege escalation attempts

Detection Strategies

• Monitor authentication logs for low-privileged accounts accessing administrative data
• Implement alerting for bulk account information retrieval operations
• Deploy network traffic analysis to detect credential data exfiltration on adjacent network segments
• Configure SIEM rules to correlate account enumeration with subsequent privilege escalation attempts

Monitoring Recommendations

• Enable detailed audit logging for all account management operations in InfoMedica
• Monitor for encoded credential data appearing in unexpected network traffic
• Implement user behavior analytics to detect anomalous access patterns
• Review access logs for signs of credential harvesting activity

How to Mitigate CVE-2025-8306

Immediate Actions Required

• Upgrade Asseco InfoMedica to version 4.50.1 or 5.38.0 or later immediately
• Audit all user accounts for signs of unauthorized access or privilege abuse
• Reset credentials for all administrative accounts as a precautionary measure
• Review network segmentation to limit adjacent network attack surface

Patch Information

Asseco has released security patches addressing this vulnerability in InfoMedica versions 4.50.1 and 5.38.0. Organizations should prioritize upgrading to these patched versions to remediate the insufficient access control vulnerability. For detailed patch information, refer to the CERT-PL advisory.

Workarounds

• Implement network segmentation to isolate InfoMedica systems from untrusted adjacent network segments
• Apply principle of least privilege by reviewing and restricting user account permissions
• Deploy additional authentication controls such as multi-factor authentication for administrative access
• Monitor and alert on suspicious account enumeration activity until patching is complete

# Network segmentation example - restrict adjacent network access
# Implement firewall rules to limit access to InfoMedica servers
iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP