CVE-2025-34034: Blue Angel Auth Bypass Vulnerability

CVE-2025-34034 Overview

A hardcoded credential vulnerability exists in the Blue Angel Software Suite deployed on embedded Linux systems. The application contains multiple known default and hardcoded user accounts that are not disclosed in public documentation. These accounts allow unauthenticated or low-privilege attackers to gain administrative access to the device's web interface. This vulnerability falls under CWE-798 (Use of Hard-coded Credentials) and poses a significant risk to organizations deploying affected embedded systems.

Critical Impact

Unauthenticated attackers can leverage undocumented hardcoded credentials to gain administrative access to the device's web interface, potentially leading to complete device compromise, data exfiltration, and lateral movement within the network. Exploitation evidence was observed by the Shadowserver Foundation on 2025-01-26 UTC.

Affected Products

• 5vtechnologies Blue Angel Software Suite (all versions)
• Embedded Linux systems running Blue Angel Software Suite
• Devices with Blue Angel Software Suite web interface exposed to the network

Discovery Timeline

• 2025-06-24 - CVE-2025-34034 published to NVD
• 2025-11-20 - Last updated in NVD database

Technical Details for CVE-2025-34034

Vulnerability Analysis

This vulnerability stems from the presence of multiple hardcoded user credentials embedded directly within the Blue Angel Software Suite application. These credentials exist in the device firmware and are not documented in any public-facing documentation, creating an asymmetric knowledge advantage for attackers who discover them. The hardcoded accounts provide administrative-level access to the device's web management interface, enabling attackers to fully compromise the affected system.

The network-accessible nature of this vulnerability means that any device with its web interface exposed to the network is potentially at risk. Attackers can exploit this vulnerability without any prior authentication, making it particularly dangerous for internet-facing deployments or environments with inadequate network segmentation.

Root Cause

The root cause of this vulnerability is the use of hard-coded credentials (CWE-798) in the Blue Angel Software Suite. During development, static credentials were embedded directly into the application code or configuration files, likely for debugging, maintenance, or initial setup purposes. These credentials were never removed before production deployment and were not disclosed to end users, leaving systems vulnerable to unauthorized access by anyone who discovers these credentials.

Attack Vector

The attack vector for CVE-2025-34034 is network-based, requiring no user interaction or prior authentication. An attacker with network access to the device's web interface can authenticate using the hardcoded credentials to gain administrative access. The attack flow typically involves:

1. Identifying a target device running Blue Angel Software Suite through network scanning or internet-wide surveys
2. Accessing the device's web management interface
3. Authenticating with discovered hardcoded credentials
4. Gaining full administrative control over the device

Once administrative access is achieved, attackers can modify device configurations, exfiltrate sensitive data, install persistent backdoors, or pivot to other systems on the network. For more technical details on the hardcoded credentials and exploitation methodology, refer to the VulnCheck Security Advisory.

Detection Methods for CVE-2025-34034

Indicators of Compromise

• Successful authentication events from unexpected IP addresses or geographic locations
• Multiple rapid authentication attempts against the web management interface
• Configuration changes made by administrative accounts during non-business hours
• New user accounts created or existing account permissions modified unexpectedly
• Unusual outbound network traffic from affected devices

Detection Strategies

• Monitor authentication logs for successful logins using known hardcoded usernames
• Implement anomaly detection for administrative access patterns to embedded devices
• Deploy network intrusion detection rules to identify exploitation attempts against exposed web interfaces
• Conduct regular audits of user accounts and access logs on deployed Blue Angel devices

Monitoring Recommendations

• Enable comprehensive logging on all Blue Angel Software Suite deployments
• Configure SIEM alerts for administrative authentication events from non-whitelisted sources
• Implement network flow monitoring to detect unusual traffic patterns from embedded devices
• Regularly review access logs and correlate with known authorized administrative activities

How to Mitigate CVE-2025-34034

Immediate Actions Required

• Audit all deployed Blue Angel Software Suite instances and identify network exposure
• Restrict network access to device web interfaces using firewall rules or network segmentation
• Place affected devices behind VPN or jump hosts requiring strong authentication
• Monitor for any signs of compromise on currently deployed devices
• Review device configurations for unauthorized changes or new user accounts

Patch Information

Organizations should monitor 5vtechnologies for security updates addressing this vulnerability. Refer to the VulnCheck Security Advisory and Exploit-DB #46792 for additional technical details and mitigation guidance. Until an official patch is available, implement the workarounds described below to reduce exposure.

Workarounds

• Implement network segmentation to isolate affected devices from untrusted networks
• Deploy web application firewall (WAF) rules to restrict access to the management interface
• Configure host-based firewall rules on affected devices to limit administrative interface access to trusted IP ranges only
• Consider disabling the web management interface entirely if not required for operations
• Implement additional authentication layers such as client certificates where supported

# Network segmentation example using iptables
# Restrict web interface access to management VLAN only
iptables -A INPUT -p tcp --dport 80 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.10.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP