CVE-2019-25290: Smartliving SmartLAN SSRF Vulnerability

CVE-2019-25290 Overview

CVE-2019-25290 is a Server-Side Request Forgery (SSRF) vulnerability affecting Smartliving SmartLAN/G/SI devices running firmware version 6.x and earlier. The vulnerability exists in the GetImage functionality, which fails to properly validate the host parameter, allowing unauthenticated attackers to craft malicious requests through the onvif.cgi endpoint.

This SSRF vulnerability enables attackers to force the vulnerable device to make arbitrary HTTP requests to external or internal domains. By exploiting this flaw, malicious actors can bypass firewall restrictions, perform internal network enumeration, and potentially access resources that should not be externally reachable.

Critical Impact

Unauthenticated attackers can leverage vulnerable SmartLAN/G/SI devices as proxies to scan internal networks, bypass security controls, and potentially pivot to other internal systems without authentication.

Affected Products

• Smartliving SmartLAN/G/SI firmware version 6.x and earlier
• Inim Electronics SmartLAN/G/SI security alarm communication devices
• SmartLAN/G series devices with exposed onvif.cgi endpoints

Discovery Timeline

• January 8, 2026 - CVE CVE-2019-25290 published to NVD
• January 8, 2026 - Last updated in NVD database

Technical Details for CVE-2019-25290

Vulnerability Analysis

This vulnerability is classified as CWE-918 (Server-Side Request Forgery). The root cause lies in the GetImage functionality's failure to validate or sanitize the host parameter before using it to construct outbound HTTP requests. The onvif.cgi endpoint, typically used for ONVIF protocol camera integration, accepts user-supplied domain values without proper input validation.

When an attacker supplies a crafted host parameter value pointing to an arbitrary external or internal domain, the SmartLAN/G/SI device blindly initiates an HTTP request to that destination. This behavior can be exploited to probe internal network infrastructure, access metadata services, or interact with internal APIs that are normally protected by network segmentation.

The network-accessible nature of this vulnerability combined with no authentication requirement significantly increases its exploitability. Attackers can remotely trigger the SSRF without any prior credentials or privileged access to the target device.

Root Cause

The vulnerability stems from insufficient input validation in the host parameter processing within the GetImage functionality. The application trusts user-supplied input and uses it directly to construct server-side HTTP requests without validating that the destination is an authorized or expected target. This lack of allowlist validation or URL sanitization enables the SSRF attack vector.

Attack Vector

The attack is network-based and requires no authentication. An attacker can exploit this vulnerability by sending a crafted HTTP request to the onvif.cgi endpoint with a malicious host parameter value. The vulnerable device then initiates an outbound request to the attacker-specified destination.

The exploitation flow involves:

1. The attacker identifies a SmartLAN/G/SI device accessible over the network
2. A malicious request is crafted targeting the onvif.cgi endpoint with a specially crafted host parameter
3. The device processes the request and initiates an HTTP connection to the attacker-specified destination
4. Response data or timing information can be used to enumerate internal networks or access protected resources

For detailed exploitation techniques, refer to the Zero Science Vulnerability Advisory ZSL-2019-5545 and the Exploit-DB #47764 entry.

Detection Methods for CVE-2019-25290

Indicators of Compromise

• Unusual outbound HTTP requests originating from SmartLAN/G/SI devices to unexpected internal or external IP addresses
• High volume of requests to the onvif.cgi endpoint from external sources
• Network logs showing the SmartLAN device connecting to internal infrastructure it normally does not communicate with
• Failed or anomalous connection attempts to internal metadata services (e.g., 169.254.169.254) from IoT devices

Detection Strategies

• Monitor and log all requests to onvif.cgi endpoints on SmartLAN/G/SI devices for suspicious host parameter values
• Implement network intrusion detection rules to identify SSRF exploitation patterns targeting these devices
• Deploy egress filtering and monitor for unexpected outbound connections from IoT/security devices
• Use web application firewalls (WAF) to detect and block requests with suspicious URL patterns in parameters

Monitoring Recommendations

• Enable comprehensive logging on SmartLAN/G/SI devices and forward logs to a centralized SIEM
• Set up alerts for outbound connection attempts from these devices to RFC1918 private address ranges they do not normally access
• Monitor for reconnaissance patterns such as sequential IP scans originating from the device
• Review network flow data for anomalous traffic patterns from security alarm communication devices

How to Mitigate CVE-2019-25290

Immediate Actions Required

• Restrict network access to SmartLAN/G/SI devices using firewall rules, limiting exposure to trusted management networks only
• Block external access to the onvif.cgi endpoint if ONVIF functionality is not required
• Implement network segmentation to isolate IoT and security devices from critical internal infrastructure
• Contact Inim Electronics for firmware update availability and patching guidance

Patch Information

No specific vendor patch information is available in the CVE data. Organizations should contact Inim Electronics directly for information regarding security updates for affected SmartLAN/G/SI devices. Review the IBM X-Force Vulnerability Database and Packet Storm Security advisory for additional remediation guidance.

Workarounds

• Place SmartLAN/G/SI devices behind a reverse proxy that validates and restricts the host parameter values
• Implement strict egress filtering to prevent the device from initiating connections to unauthorized destinations
• Disable or block access to the onvif.cgi endpoint if the ONVIF camera integration feature is not in use
• Use network access control lists (ACLs) to limit which internal resources the device can reach

# Example: Firewall rules to restrict SmartLAN device access
# Block external access to onvif.cgi endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "onvif.cgi" --algo bm -j DROP

# Restrict outbound connections from SmartLAN device to authorized destinations only
iptables -A FORWARD -s <SMARTLAN_IP> -d <AUTHORIZED_SUBNET> -j ACCEPT
iptables -A FORWARD -s <SMARTLAN_IP> -j DROP