CVE-2024-13030: D-Link DIR-823G Auth Bypass Vulnerability

CVE-2024-13030 Overview

A critical improper access controls vulnerability has been identified in D-Link DIR-823G firmware version 1.0.2B05_20181207. This issue affects multiple functions within the Web Management Interface, specifically in the /HNAP1/ file handler. The vulnerable functions include SetAutoRebootSettings, SetClientInfo, SetDMZSettings, SetFirewallSettings, SetParentsControlInfo, SetQoSSettings, and SetVirtualServerSettings. Due to improper access controls, an attacker can remotely manipulate these functions without proper authorization.

Critical Impact

Unauthorized remote attackers can modify critical router settings including firewall configurations, DMZ settings, QoS parameters, and virtual server configurations, potentially compromising network security and enabling further attacks.

Affected Products

• D-Link DIR-823G Firmware version 1.0.2B05_20181207
• D-Link DIR-823G Hardware
• D-Link DIR-823G Web Management Interface

Discovery Timeline

• 2024-12-30 - CVE-2024-13030 published to NVD
• 2025-07-15 - Last updated in NVD database

Technical Details for CVE-2024-13030

Vulnerability Analysis

This vulnerability represents a firmware security flaw in the D-Link DIR-823G router's web management interface. The issue stems from improper access control implementation (CWE-266: Incorrect Privilege Assignment) affecting multiple administrative functions exposed through the HNAP1 protocol endpoint.

The vulnerable functions handle critical router configuration operations including automatic reboot scheduling, client management, DMZ configuration, firewall rules, parental controls, Quality of Service settings, and virtual server mappings. Without proper authentication and authorization checks, these functions can be invoked by remote attackers.

The attack is network-based and requires no user interaction or prior authentication, making it particularly dangerous for routers exposed to untrusted networks. The exploit has been publicly disclosed, increasing the risk of active exploitation in the wild.

Root Cause

The root cause of CVE-2024-13030 is CWE-266: Incorrect Privilege Assignment. The web management interface fails to properly validate user privileges before allowing access to sensitive configuration functions. The /HNAP1/ endpoint processes requests to administrative functions without verifying that the requester has appropriate authorization credentials, allowing unauthenticated users to execute privileged operations.

Attack Vector

The attack vector is network-based, allowing remote exploitation without requiring physical access to the device. An attacker can send specially crafted requests to the /HNAP1/ endpoint targeting any of the seven vulnerable functions. Since no authentication is required, the attacker can directly manipulate router configurations by crafting HTTP requests to the management interface.

The exploitation flow involves:

1. Identifying a vulnerable D-Link DIR-823G router on the network
2. Sending HTTP requests to the /HNAP1/ endpoint
3. Invoking vulnerable functions such as SetFirewallSettings or SetDMZSettings
4. Modifying router configurations without authorization

For detailed technical information about the exploitation mechanism, refer to the GitHub Vulnerability Documentation and VulDB ID #289763.

Detection Methods for CVE-2024-13030

Indicators of Compromise

• Unexpected HTTP POST requests to /HNAP1/ endpoint from external IP addresses
• Unauthorized modifications to firewall rules, DMZ settings, or QoS configurations
• Unusual network traffic patterns indicating router configuration changes
• Log entries showing access to SetAutoRebootSettings, SetClientInfo, SetDMZSettings, SetFirewallSettings, SetParentsControlInfo, SetQoSSettings, or SetVirtualServerSettings functions

Detection Strategies

• Implement network monitoring to detect HTTP requests targeting the /HNAP1/ endpoint from untrusted sources
• Deploy intrusion detection rules to flag unauthorized HNAP protocol communications
• Monitor router configuration files for unexpected changes to firewall, DMZ, or virtual server settings
• Enable logging on the router's web management interface and review for suspicious activity

Monitoring Recommendations

• Configure network intrusion detection systems (IDS) to alert on HNAP protocol traffic to internal router management interfaces
• Establish baseline configurations for affected routers and implement change detection mechanisms
• Monitor outbound connections from the router that may indicate compromise
• Segment network management interfaces from untrusted network segments

How to Mitigate CVE-2024-13030

Immediate Actions Required

• Restrict access to the router's web management interface to trusted internal networks only
• Implement firewall rules to block external access to the management interface on port 80/443
• Consider replacing end-of-life D-Link DIR-823G devices with supported hardware
• Disable remote management features if not required for operations

Patch Information

D-Link has not released a specific patch for this vulnerability in the enriched data provided. Users should check the D-Link Official Website and D-Link News Article for the latest security advisories and firmware updates. Given the age of the affected firmware (1.0.2B05_20181207 from December 2018), this device may be end-of-life and no longer receiving security updates.

Workarounds

• Disable the HNAP protocol if not required for device management functionality
• Place the router behind an additional firewall that restricts access to the management interface
• Use VPN-only access for remote router administration instead of exposing the web interface
• Implement network segmentation to isolate IoT and networking devices from general network traffic

# Example iptables rules to restrict management interface access
# Block external access to router management interface
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

# Log suspicious HNAP access attempts
iptables -A INPUT -p tcp --dport 80 -m string --string "/HNAP1/" --algo bm -j LOG --log-prefix "HNAP_ACCESS: "