CVE-2025-32967

Executive Summary

CVE-2025-32967 is a medium-severity vulnerability in OpenEMR, a widely used open-source electronic health records (EHR) system. The flaw lies in a logging oversight that prevents password change events from being recorded in the client-side log viewer. This omission weakens audit trail integrity, making it difficult for administrators to detect unauthorized password modifications. While the vulnerability does not directly allow remote code execution or data exfiltration, it significantly impairs the ability to detect insider threats or compromised accounts, as critical security events are invisible to standard monitoring tools.

Supply Chain & Package Security

This vulnerability is not related to a package manager (NPM, PyPI, Go, Ruby) but is a direct code-level issue within the OpenEMR application. The patch is available in the official OpenEMR repository.

CVSS Breakdown & Threat Level

• CVSS Score: 5.4 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
• Attack Vector (AV): Network (N) – The vulnerability can be exploited remotely.
• Attack Complexity (AC): Low (L) – No special conditions are required.
• Privileges Required (PR): Low (L) – An attacker needs a valid user account.
• User Interaction (UI): None (N) – No user action is required.
• Scope (S): Unchanged (U) – The impact is confined to the vulnerable component.
• Confidentiality (C): None (N) – No direct data exposure.
• Integrity (I): Low (L) – The integrity of audit logs is compromised.
• Availability (A): Low (L) – The ability to detect and respond to incidents is degraded.

Threat Level: Medium. The vulnerability is exploitable by authenticated users, including insiders, to hide malicious password changes. While not directly exploitable for data theft, it enables undetected account takeover and lateral movement.

Deep Dive & Mechanics

The vulnerability stems from a missing logging call in the password change functionality. When a user changes their password, the application fails to write an event to the client-side log viewer. This log viewer is the primary interface for administrators to review security-relevant actions. Without this event, password changes become invisible to standard auditing processes.

Attack Scenario:

1. An attacker gains access to a low-privileged user account (e.g., via phishing or credential stuffing).
2. The attacker changes the password of a privileged account (e.g., an administrator).
3. The password change is not recorded in the client-side log viewer.
4. The attacker uses the compromised privileged account to access sensitive patient data or modify system settings.
5. The administrator, relying on the log viewer, sees no evidence of the password change and may not detect the breach until significant damage is done.

Technical Root Cause: The issue is in the interface/usergroup/usergroup_admin.php file (or similar) where the password update logic is executed. The code performs the database update but omits the logEvent() call that would record the action in the audit log.

Vulnerable vs. Patched Code

Vulnerable Code (Pre-7.0.3.4):

// Vulnerable: No logging of password change
$sql = "UPDATE users SET password = ? WHERE id = ?";
sqlStatement($sql, [$hashed_password, $user_id]);
// Missing: logEvent('password_change', $user_id, $_SESSION['authUserID']);

Patched Code (7.0.3.4):

// Patched: Logging added
$sql = "UPDATE users SET password = ? WHERE id = ?";
sqlStatement($sql, [$hashed_password, $user_id]);
logEvent('password_change', $user_id, $_SESSION['authUserID']);

The patch adds a single line to call logEvent() after the password update, ensuring the event is recorded in the audit log.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Valid user credentials (any role).
• Network access to the OpenEMR web interface.

Steps:

1. Log in to OpenEMR with the compromised user account.
2. Navigate to the user management section (e.g., /interface/usergroup/usergroup_admin.php).
3. Change the password of a target user (e.g., an administrator).
4. The password change is executed without generating a log entry in the client-side log viewer.
5. The attacker can now use the new password to access the target account.

Proof of Concept (No public exploit available):

# Using curl to change password (requires session cookie)
curl -X POST -b "PHPSESSID=attacker_session" \
  -d "new_password=NewP@ssw0rd&confirm_password=NewP@ssw0rd&user_id=2" \
  "http://target/interface/usergroup/usergroup_admin.php"

Blue Team (Detection & Defense)

Detection:

• Monitor server-side logs (e.g., Apache/Nginx access logs) for POST requests to usergroup_admin.php with parameters new_password and user_id.
• Implement database-level triggers to log password changes in a separate, immutable audit table.
• Use file integrity monitoring (FIM) to detect changes to the users table.

Defense:

• Apply the patch by upgrading to OpenEMR 7.0.3.4 or later.
• Enable and monitor server-side logging (e.g., syslog) for all authentication and authorization events.
• Implement multi-factor authentication (MFA) to reduce the risk of account takeover.
• Conduct regular audits of user accounts and password change history.

Indicators of Compromise (IOCs)

• Network:
  • POST requests to /interface/usergroup/usergroup_admin.php with new_password and user_id parameters.
  • Unusual login times or locations for accounts that have had their passwords changed.
• Host:
  • Missing log entries in the OpenEMR client-side log viewer for password changes.
  • Unexpected changes to the users table in the database.
• Log:
  • Absence of password_change events in the log_entries table (or equivalent).

Detection Engineering

YARA Rule

rule CVE_2025_32967_OpenEMR_Logging_Omission {
    meta:
        description = "Detects missing logEvent call in OpenEMR password change code"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-32967"
    strings:
        $vuln_code = "UPDATE users SET password = ? WHERE id = ?"
        $missing_log = "logEvent('password_change'"
    condition:
        $vuln_code and not $missing_log
}

Sigma Rule

title: OpenEMR Password Change Without Logging
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects password change requests to OpenEMR that may not be logged
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/interface/usergroup/usergroup_admin.php'
        cs-uri-query|contains: 'new_password'
    condition: selection
falsepositives:
    - Legitimate password changes by administrators
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-32967 OpenEMR Password Change Without Logging";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/interface/usergroup/usergroup_admin.php"; http_uri;
    content:"new_password"; http_client_body;
    sid:1000001;
    rev:1;
    reference:cve,2025-32967;
    classtype:attempted-admin;
    priority:2;
)

Remediation & Mitigation

Immediate:

1. Upgrade OpenEMR to version 7.0.3.4 or later. This is the only complete fix.
2. Implement compensating controls such as database triggers to log password changes in a separate, immutable table.
3. Enable server-side logging for all authentication events and monitor for anomalies.

Long-term:

• Conduct a security audit of all logging mechanisms in OpenEMR.
• Implement a Security Information and Event Management (SIEM) system to correlate logs from multiple sources.
• Enforce the principle of least privilege to minimize the impact of compromised accounts.
• Regularly review and test incident response procedures.

Workaround: If immediate patching is not possible, consider disabling the client-side log viewer and relying solely on server-side logs. However, this is not a complete solution as the underlying code still fails to log the event.

Valters IT
Securing Digital Health, One Patch at a Time.