CVE-2019-25291: INIM SmartLiving Auth Bypass Vulnerability

CVE-2019-25291 Overview

INIM Electronics Smartliving SmartLAN/G/SI versions 6.x and earlier contain a critical hardcoded credentials vulnerability (CWE-798) that exposes affected devices to unauthorized access. The Linux distribution image used in these devices includes embedded credentials that cannot be modified through normal device operations, creating a persistent security weakness that attackers can exploit to gain full system access.

This vulnerability affects home and business security systems manufactured by INIM Electronics, allowing remote attackers with network access to authenticate using the hardcoded credentials and potentially compromise the security infrastructure protecting physical premises.

Critical Impact

Attackers can leverage hardcoded credentials to gain unauthorized access to security alarm systems, potentially disabling physical security protections or gaining surveillance access.

Affected Products

• INIM Electronics Smartliving SmartLAN/G/SI version 6.x and earlier
• Multiple SmartLiving device models running affected firmware

Discovery Timeline

• 2026-01-08 - CVE CVE-2019-25291 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2019-25291

Vulnerability Analysis

The vulnerability stems from hardcoded credentials embedded within the Linux distribution image that powers INIM Electronics Smartliving SmartLAN/G/SI devices. These credentials are compiled directly into the firmware and cannot be modified through the device's administrative interface or any standard operational procedure available to end users or administrators.

The hardcoded credentials provide network-accessible authentication, meaning any attacker who can reach the device over the network can attempt to authenticate using these static credentials. Once authenticated, the attacker gains the same level of system access as legitimate users, potentially including administrative privileges depending on the credential level.

This type of vulnerability is particularly severe in security-critical devices like alarm systems, as successful exploitation could allow attackers to monitor premises, disable alarms, or manipulate the security system's behavior without the owner's knowledge.

Root Cause

The root cause of this vulnerability is the inclusion of static, unchangeable credentials within the device firmware's Linux distribution image. This represents a fundamental design flaw where authentication secrets are compiled into the system rather than being configurable post-deployment. The credentials persist across device reboots and cannot be removed or modified by users, creating a permanent backdoor into affected devices.

Attack Vector

The attack vector is network-based, requiring the attacker to have network connectivity to the target device. In many deployment scenarios, these security devices may be accessible from local networks or, in misconfigured environments, potentially exposed to the internet.

An attacker would identify a vulnerable SmartLiving device on the network, attempt authentication using the known hardcoded credentials documented in public vulnerability databases and exploit repositories, and upon successful authentication, gain unauthorized access to the device's functionality. Additional technical details regarding the exploitation methodology can be found in the Zero Science Vulnerability Report ZSL-2019-5546 and the Exploit-DB #47763 entry.

Detection Methods for CVE-2019-25291

Indicators of Compromise

• Unexpected authentication events or login sessions on SmartLiving devices from unknown IP addresses
• Unusual network connections to the SmartLAN/G/SI device management interface
• Configuration changes to alarm system settings without authorized administrator activity
• Logs showing successful authentication using the hardcoded credential username

Detection Strategies

• Monitor network traffic for authentication attempts to SmartLiving device management ports
• Implement network segmentation monitoring to detect unauthorized access attempts to IoT/security device subnets
• Deploy intrusion detection rules to identify known exploitation patterns associated with this vulnerability
• Review device access logs regularly for authentication events from unexpected sources

Monitoring Recommendations

• Isolate SmartLiving devices on dedicated network segments with strict access controls and monitoring
• Implement firewall rules to restrict management interface access to authorized IP addresses only
• Enable logging on network devices to capture all traffic to and from affected security systems
• Consider deploying network detection capabilities to identify reconnaissance or exploitation attempts

How to Mitigate CVE-2019-25291

Immediate Actions Required

• Restrict network access to affected SmartLiving devices using firewall rules or network segmentation
• Ensure devices are not exposed to the internet or untrusted networks
• Implement network-level authentication controls to limit who can reach device management interfaces
• Contact INIM Electronics to inquire about firmware updates that address this vulnerability

Patch Information

Users should check with INIM Electronics for firmware updates that may address this hardcoded credentials issue. Visit the INIM Security Overview page for vendor contact information and potential security advisories. Additional vulnerability details are available through the IBM X-Force Vulnerability Report and Packet Storm Security File.

Workarounds

• Place affected devices behind a VPN or secure network gateway requiring additional authentication
• Implement strict network segmentation to isolate security devices from general network access
• Use network access control lists (ACLs) to whitelist only trusted administrator IP addresses
• Consider replacing affected devices with alternatives that do not contain hardcoded credentials if no vendor patch is available

# Example: Restrict network access to SmartLiving device (iptables)
# Replace DEVICE_IP with the actual IP address of the vulnerable device
# Replace ADMIN_IP with authorized administrator IP addresses

iptables -A INPUT -d DEVICE_IP -s ADMIN_IP -j ACCEPT
iptables -A INPUT -d DEVICE_IP -j DROP