CVE-2024-11047: D-Link DI-8003 Buffer Overflow Vulnerability

CVE-2024-11047 Overview

CVE-2024-11047 is a stack-based buffer overflow vulnerability in the D-Link DI-8003 router running firmware version 16.07.16A1. The flaw exists in the upgrade_filter_asp function within the /upgrade_filter.asp endpoint. Attackers can trigger the overflow by manipulating the path argument, allowing remote exploitation against affected devices. The issue is tracked as [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer). Public disclosure includes proof-of-concept details, increasing the likelihood of exploitation attempts against exposed devices.

Critical Impact

Remote attackers with low-privileged access can corrupt the stack on D-Link DI-8003 devices, potentially leading to denial of service or arbitrary code execution on affected routers.

Affected Products

• D-Link DI-8003 router (hardware revision A1)
• D-Link DI-8003 firmware version 16.07.16A1
• Networks exposing the device web management interface

Discovery Timeline

• 2024-11-10 - CVE-2024-11047 published to NVD
• 2024-11-13 - Last updated in NVD database

Technical Details for CVE-2024-11047

Vulnerability Analysis

The vulnerability resides in the upgrade_filter_asp handler that processes requests to /upgrade_filter.asp on the DI-8003 web management interface. The handler reads the path parameter from the incoming HTTP request and copies it into a fixed-size stack buffer without enforcing length validation.

When an attacker supplies an oversized path value, the copy operation writes past the buffer boundary. This overwrites adjacent stack data, including saved frame pointers and return addresses. Successful exploitation can redirect control flow on the MIPS-based embedded firmware.

The issue is classified under [CWE-119]. Exploitation requires network reachability to the management interface and a low-privileged authenticated session, as reflected by the PR:L component of the CVSS vector.

Root Cause

The root cause is missing bounds checking when the firmware copies the user-controlled path argument into a stack-allocated buffer. The handler trusts the attacker-supplied length and uses unsafe string operations typical of legacy embedded CGI code. No stack canaries or address space layout randomization are present in the firmware to mitigate the corruption.

Attack Vector

The attack vector is remote over the network. An attacker sends a crafted HTTP request to /upgrade_filter.asp with an oversized path parameter targeting the upgrade_filter_asp function. The malformed request triggers the stack overflow during request parsing. Public proof-of-concept details are available in the referenced GitHub PoC Repository.

No verified exploit code is included here. Refer to the VulDB Entry #283633 for additional technical context on the disclosed proof of concept.

Detection Methods for CVE-2024-11047

Indicators of Compromise

• HTTP POST or GET requests to /upgrade_filter.asp containing abnormally long path parameter values
• Unexpected reboots, web service crashes, or watchdog resets on DI-8003 devices
• Outbound connections from the router to unknown infrastructure following management interface access
• Authentication events from unusual source IPs preceding requests to upgrade_filter.asp

Detection Strategies

• Inspect web access logs on DI-8003 devices for requests targeting /upgrade_filter.asp with non-standard parameter lengths
• Deploy network intrusion detection signatures that flag oversized path values in HTTP requests to D-Link management endpoints
• Correlate authentication logs with subsequent requests to firmware upgrade endpoints to surface low-privileged abuse

Monitoring Recommendations

• Monitor management interface exposure and restrict it to trusted administrative networks
• Alert on repeated 5xx responses or service restarts originating from the DI-8003 web server
• Track outbound traffic from the device for signs of post-exploitation command-and-control activity

How to Mitigate CVE-2024-11047

Immediate Actions Required

• Remove the DI-8003 management interface from internet-facing networks and limit access to a dedicated administrative VLAN
• Rotate all administrative credentials on affected devices to reduce the value of any captured low-privileged accounts
• Audit device logs for prior requests to /upgrade_filter.asp that may indicate exploitation attempts
• Inventory all D-Link DI-8003 units running firmware 16.07.16A1 and prioritize them for remediation

Patch Information

At the time of NVD publication, no vendor patch is referenced in the advisory data. Consult the D-Link Official Website for security bulletins and firmware updates. If the device is end-of-life or no fix is available, plan migration to a supported platform.

Workarounds

• Disable remote management on the WAN interface and restrict LAN-side access via firewall ACLs
• Place the device behind a reverse proxy or VPN that enforces strong authentication before reaching the web UI
• Segment the router from sensitive internal assets to limit blast radius if the device is compromised
• Replace unsupported hardware with a model that receives active security maintenance

# Example firewall restriction limiting management access to a trusted subnet
iptables -A INPUT -p tcp --dport 80 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.10.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP