CVE-2025-1100: Q-free Maxtime RCE Vulnerability

CVE-2025-1100 Overview

CVE-2025-1100 is a critical hardcoded credentials vulnerability affecting Q-Free MaxTime traffic management systems. The vulnerability stems from a hard-coded password for the root account (CWE-259), which allows unauthenticated remote attackers to gain complete control over affected systems via SSH. This represents a severe security flaw as it enables arbitrary code execution with the highest level of system privileges.

Critical Impact

Unauthenticated remote attackers can leverage the hard-coded root password to execute arbitrary code with root privileges via SSH, potentially compromising entire traffic management infrastructure.

Affected Products

• Q-Free MaxTime version 2.11.0 and earlier
• Q-Free MaxTime traffic management systems with SSH enabled
• All deployments running vulnerable MaxTime firmware versions

Discovery Timeline

• 2025-02-12 - CVE-2025-1100 published to NVD
• 2025-10-24 - Last updated in NVD database

Technical Details for CVE-2025-1100

Vulnerability Analysis

This vulnerability is classified as CWE-259 (Use of Hard-coded Password), a significant security weakness where authentication credentials are embedded directly in the application code or firmware. In the case of Q-Free MaxTime, the root account password is hard-coded into the system, meaning all deployed instances share the same root credentials.

The attack surface is particularly concerning because SSH access is network-accessible, requiring no prior authentication or user interaction. An attacker who discovers or extracts the hard-coded password can authenticate to any vulnerable MaxTime system exposed to the network and immediately gain root-level access.

Traffic management systems like MaxTime are critical infrastructure components. Compromise of these systems could lead to manipulation of traffic signals, denial of service affecting transportation networks, lateral movement into connected infrastructure, and data exfiltration from traffic monitoring systems.

Root Cause

The root cause of this vulnerability is the use of a hard-coded password for the root account embedded within the Q-Free MaxTime firmware. This is a fundamental security design flaw that violates secure development practices. Hard-coded credentials are particularly dangerous because:

1. They cannot be changed by system administrators without vendor intervention
2. Once discovered, they affect all deployed instances
3. They persist across system restarts and updates until specifically remediated
4. They provide attackers with a reliable, universal authentication method

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by:

1. Identifying Q-Free MaxTime systems exposed on the network (either internally or via the internet)
2. Attempting SSH connections to port 22 (or configured SSH port)
3. Authenticating using the hard-coded root credentials
4. Executing arbitrary commands with full root privileges

The exploitation process is straightforward once the hard-coded password is known. Attackers could discover the password through firmware analysis, reverse engineering, or public disclosure. Once authenticated, the attacker has complete control over the target system.

For detailed technical information, refer to the Nozomi Networks Vulnerability Advisory.

Detection Methods for CVE-2025-1100

Indicators of Compromise

• Unexpected SSH login attempts or successful authentications to MaxTime systems from unknown IP addresses
• Root account SSH sessions originating from external or unauthorized internal networks
• Unusual process execution or command activity on MaxTime systems
• Changes to system configuration files or scheduled tasks
• Network connections from MaxTime systems to suspicious external destinations

Detection Strategies

• Monitor SSH authentication logs for root account access attempts, particularly from unexpected sources
• Implement network-based intrusion detection rules to alert on SSH connections to MaxTime systems from unauthorized networks
• Deploy endpoint detection and response (EDR) solutions capable of monitoring process execution on embedded Linux systems
• Establish baseline network behavior for MaxTime systems and alert on anomalies

Monitoring Recommendations

• Enable verbose SSH logging on MaxTime systems to capture all authentication attempts
• Implement centralized log collection from all traffic management infrastructure
• Configure alerts for any root SSH sessions that don't originate from approved management networks
• Monitor for reconnaissance activity targeting MaxTime systems, including port scans and service enumeration

How to Mitigate CVE-2025-1100

Immediate Actions Required

• Identify all Q-Free MaxTime systems running version 2.11.0 or earlier in your environment
• Immediately restrict SSH access to MaxTime systems using network segmentation and firewall rules
• Limit SSH access to specific management IP addresses or jump hosts only
• Contact Q-Free support to obtain information about available patches or firmware updates
• Consider temporarily disabling SSH access entirely if remote management is not critical

Patch Information

Organizations should contact Q-Free directly for information about security updates addressing CVE-2025-1100. Review the Nozomi Networks Vulnerability Advisory for additional guidance on remediation steps.

Until a patch is available, implement the network-level mitigations described below to reduce exposure.

Workarounds

• Implement strict network segmentation to isolate MaxTime systems from general network access
• Configure firewall rules to allow SSH access only from specific, trusted management IP addresses
• Deploy a jump host or bastion server as the only authorized SSH source for MaxTime systems
• Consider using a VPN for remote management access rather than direct SSH exposure
• Implement additional authentication layers such as port knocking or single packet authorization where feasible

# Example firewall rule to restrict SSH access to MaxTime systems
# Allow SSH only from management network 192.168.10.0/24
iptables -A INPUT -p tcp --dport 22 -s 192.168.10.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP