CVE-2025-57105: Dlink Di-7400g+ Firmware RCE Vulnerability

CVE-2025-57105 Overview

CVE-2025-57105 is a critical command injection vulnerability affecting the D-Link DI-7400G+ router. This firmware vulnerability allows remote attackers to execute arbitrary commands on the affected device without authentication. The vulnerability exists in the jhttpd program, specifically within the sub_478D28 function in mng_platform.asp and the sub_4A12DC function in wayos_ac_server.asp, where the ac_mng_srv_host parameter is improperly handled.

Critical Impact

Remote attackers can achieve full device compromise through unauthenticated command injection, potentially leading to complete network infrastructure takeover, data exfiltration, and lateral movement within connected networks.

Affected Products

• D-Link DI-7400G+ Firmware version 19.12.25A1
• D-Link DI-7400G+ Hardware Revision A1
• D-Link DI-7400G+ Router (all configurations running vulnerable firmware)

Discovery Timeline

• 2025-08-22 - CVE-2025-57105 published to NVD
• 2025-10-02 - Last updated in NVD database

Technical Details for CVE-2025-57105

Vulnerability Analysis

This command injection vulnerability (CWE-77) stems from improper neutralization of special elements used in command construction. The D-Link DI-7400G+ router's web management interface processes user-supplied input through the ac_mng_srv_host parameter without adequate sanitization or validation. When this parameter is passed to the vulnerable functions sub_478D28 and sub_4A12DC within the jhttpd web server process, an attacker can inject shell metacharacters and arbitrary commands that are subsequently executed with the privileges of the web server process.

The network-accessible nature of this vulnerability, combined with the lack of authentication requirements, makes it particularly dangerous for internet-exposed devices. Successful exploitation grants attackers the ability to execute commands with elevated privileges on the underlying embedded Linux operating system.

Root Cause

The root cause of CVE-2025-57105 lies in insufficient input validation within the jhttpd program. The ac_mng_srv_host parameter, intended to accept hostname or IP address values, is passed directly to system command execution functions without proper sanitization. This allows shell metacharacters such as semicolons (;), pipes (|), and command substitution operators ($() or backticks) to break out of the intended command context and execute attacker-controlled commands.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests targeting the mng_platform.asp or wayos_ac_server.asp endpoints with a weaponized ac_mng_srv_host parameter value. The injected commands execute in the context of the jhttpd web server process, typically running with root or elevated privileges on embedded devices. This provides attackers with the ability to modify device configurations, install persistent backdoors, intercept network traffic, or pivot to other systems on the network.

The vulnerability is particularly concerning for devices exposed to the internet or accessible from untrusted network segments. Exploitation requires only the ability to send HTTP requests to the device's management interface.

Detection Methods for CVE-2025-57105

Indicators of Compromise

• Unexpected outbound network connections from the router to unknown IP addresses or command-and-control infrastructure
• Unusual process spawning from the jhttpd process, particularly shells (/bin/sh, /bin/bash) or network utilities (wget, curl, tftp)
• Modified configuration files or unauthorized firmware changes on the device
• HTTP access logs showing requests to mng_platform.asp or wayos_ac_server.asp with suspicious ac_mng_srv_host parameter values containing shell metacharacters

Detection Strategies

• Deploy network intrusion detection systems (IDS/IPS) with signatures designed to detect command injection patterns in HTTP traffic targeting D-Link management interfaces
• Monitor HTTP request logs for requests containing shell metacharacters (;, |, &, $(), backticks) in the ac_mng_srv_host parameter
• Implement web application firewall (WAF) rules to block requests with command injection payloads targeting the vulnerable ASP endpoints
• Conduct regular firmware integrity verification to detect unauthorized modifications

Monitoring Recommendations

• Enable comprehensive logging on network perimeter devices to capture traffic to and from D-Link router management interfaces
• Configure SIEM alerts for anomalous behavior patterns from IoT and network infrastructure devices
• Implement network segmentation monitoring to detect lateral movement attempts originating from compromised routers
• Deploy endpoint detection and response (EDR) solutions capable of monitoring embedded device behavior where applicable

How to Mitigate CVE-2025-57105

Immediate Actions Required

• Restrict access to the router's web management interface to trusted administrative networks only using firewall rules or access control lists
• Disable remote management features if not required for operations
• Implement network segmentation to isolate vulnerable devices from critical network resources
• Monitor the D-Link Security Bulletin page for firmware updates addressing this vulnerability

Patch Information

At the time of publication, users should check the D-Link DI-7400 Technical Support page for the latest firmware updates. D-Link customers are advised to regularly check for security advisories and apply patches as they become available. Additional technical details regarding this vulnerability can be found at the GitHub IoT Proof of Concept repository.

Workarounds

• Configure firewall rules to block external access to the web management interface (typically TCP ports 80 and 443)
• Place the router behind a VPN gateway requiring authentication before management access is permitted
• Implement IP whitelisting to restrict management interface access to specific administrative workstations only
• Consider replacing vulnerable devices with newer models that receive regular security updates if patches are not available

# Example iptables rules to restrict management interface access
# Block external access to web management ports
iptables -A INPUT -p tcp --dport 80 -s ! 192.168.1.0/24 -j DROP
iptables -A INPUT -p tcp --dport 443 -s ! 192.168.1.0/24 -j DROP

# Allow management access only from specific admin workstation
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.100 -j ACCEPT