CVE-2025-34143: ETQ Reliance Auth Bypass Vulnerability

CVE-2025-34143 Overview

An authentication bypass vulnerability exists in ETQ Reliance on the CG (legacy) platform that allows unauthenticated attackers with network access to the login page to gain elevated access by manipulating the username field. The application permits login as the privileged internal SYSTEM user, which does not require a password. Once authenticated, an attacker can achieve remote code execution by modifying Jython scripts within the application, leading to complete system compromise.

Critical Impact

This vulnerability enables unauthenticated remote attackers to bypass authentication, gain SYSTEM-level privileges, and execute arbitrary code on affected ETQ Reliance CG installations.

Affected Products

• ETQ Reliance CG (legacy) platform - versions prior to MP-4583

Discovery Timeline

• 2025-07-22 - CVE-2025-34143 published to NVD
• 2025-11-04 - Last updated in NVD database

Technical Details for CVE-2025-34143

Vulnerability Analysis

The authentication bypass vulnerability in ETQ Reliance CG stems from inadequate validation of internal system accounts during the public authentication workflow. The application exposes a privileged SYSTEM account through the standard login interface, and critically, this account does not require password authentication. By manipulating the username field to target this internal account, an attacker can bypass all authentication controls and gain immediate elevated access to the application.

The vulnerability chain extends beyond initial access. Once authenticated as the SYSTEM user, attackers can leverage the application's Jython scripting capabilities to achieve remote code execution. Jython scripts within ETQ Reliance run with elevated privileges, allowing attackers to execute arbitrary commands on the underlying operating system.

Root Cause

The root cause of this vulnerability is insufficient validation logic in the authentication workflow that fails to exclude internal system accounts from public authentication endpoints. The SYSTEM account, designed for internal application processes, was inadvertently accessible through the standard login interface without password requirements. This design flaw violates the principle of least privilege by exposing administrative functionality to unauthenticated users.

Attack Vector

The attack vector is network-based, requiring only access to the ETQ Reliance login page. An attacker performs the following exploitation path:

1. The attacker navigates to the ETQ Reliance login page accessible over the network
2. The attacker manipulates the username field to authenticate as the internal SYSTEM user
3. Since the SYSTEM account requires no password, authentication succeeds immediately
4. With SYSTEM-level access, the attacker navigates to the Jython scripting interface
5. The attacker modifies or creates Jython scripts to execute arbitrary commands
6. Code execution occurs with the privileges of the ETQ Reliance application service

The exploitation requires no user interaction and can be performed by any attacker with network access to the login endpoint. According to SLCyber Research, the vulnerability was discovered during security research into the platform's authentication mechanisms.

Detection Methods for CVE-2025-34143

Indicators of Compromise

• Authentication events for the SYSTEM username or other internal accounts originating from external network addresses
• Unusual modifications to Jython scripts within the ETQ Reliance application
• Process execution spawned from the ETQ Reliance application service with unexpected command-line arguments
• Login attempts with internal account names such as SYSTEM, ADMIN, or similar privileged identifiers

Detection Strategies

• Implement authentication log monitoring to detect login attempts using reserved internal account names
• Deploy network intrusion detection rules to identify manipulation of username fields in login requests
• Monitor file integrity for Jython scripts within the ETQ Reliance installation directory
• Configure alerting for any successful authentication events associated with internal system accounts

Monitoring Recommendations

• Enable verbose logging on the ETQ Reliance application to capture all authentication attempts with full request details
• Establish baseline activity patterns for legitimate SYSTEM account usage and alert on deviations
• Monitor outbound network connections from the ETQ Reliance server for potential command-and-control activity
• Implement endpoint detection and response (EDR) solutions to identify post-exploitation activity such as script modification or process spawning

How to Mitigate CVE-2025-34143

Immediate Actions Required

• Upgrade ETQ Reliance CG to version MP-4583 or later, which introduces stricter validation logic to exclude internal accounts from public authentication workflows
• If immediate patching is not possible, restrict network access to the ETQ Reliance login page using firewall rules or network segmentation
• Review authentication logs for any historical access attempts using the SYSTEM username or similar internal accounts
• Audit Jython scripts within the application for unauthorized modifications

Patch Information

ETQ has released version MP-4583 which resolves this vulnerability by introducing stricter validation logic to exclude internal accounts from public authentication workflows. Organizations running the ETQ Reliance CG (legacy) platform should apply this update immediately. For detailed patch information, refer to the ETQ Reliance Security Update.

The VulnCheck Advisory provides additional technical details regarding the authentication bypass mechanism.

Workarounds

• Implement network-level access controls to restrict access to the ETQ Reliance login page to trusted IP addresses only
• Deploy a web application firewall (WAF) with rules to block login attempts containing internal account identifiers in the username field
• Disable or rename internal system accounts if the application supports it, until the patch can be applied
• Isolate the ETQ Reliance server on a dedicated network segment with strict ingress and egress filtering

Organizations should treat exposed ETQ Reliance CG installations as high-priority targets for remediation given the critical nature of this vulnerability and the potential for unauthenticated remote code execution.