CVE-2024-11048: D-Link DI-8003 Buffer Overflow Vulnerability

CVE-2024-11048 Overview

CVE-2024-11048 is a stack-based buffer overflow vulnerability in the D-Link DI-8003 router running firmware version 16.07.16A1. The flaw resides in the dbsrv_asp function within the /dbsrv.asp endpoint, where manipulation of the str argument triggers memory corruption on the stack. Attackers can exploit the issue remotely over the network with low privileges and no user interaction. The exploit has been publicly disclosed, increasing the risk of opportunistic attacks against exposed devices. The vulnerability is tracked under CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer.

Critical Impact

Remote attackers with low-level credentials can corrupt stack memory on the DI-8003 router, leading to potential arbitrary code execution and full compromise of the device's confidentiality, integrity, and availability.

Affected Products

• D-Link DI-8003 hardware revision A1
• D-Link DI-8003 firmware version 16.07.16A1
• Deployments exposing the /dbsrv.asp management endpoint to untrusted networks

Discovery Timeline

• 2024-11-10 - CVE-2024-11048 published to the National Vulnerability Database (NVD)
• 2024-11-13 - Last updated in NVD database

Technical Details for CVE-2024-11048

Vulnerability Analysis

The vulnerability resides in the dbsrv_asp handler responsible for processing requests to /dbsrv.asp on the DI-8003 web management interface. When the handler reads the str parameter from an incoming HTTP request, it copies the attacker-supplied value into a fixed-size stack buffer without enforcing length boundaries. Supplying an oversized value overwrites adjacent stack memory, including saved return addresses and frame pointers on the MIPS-based platform typical of D-Link SOHO routers.

The attack surface is reachable across the network, and the only prerequisite is authenticated access at a low privilege level. Successful exploitation can pivot from memory corruption to arbitrary code execution within the embedded web service, granting attackers persistent control over routing, DNS, and traffic interception capabilities.

Root Cause

The root cause is missing input validation and unsafe buffer handling [CWE-119] in the dbsrv_asp function. The firmware does not bound the length of the str parameter before copying it into a local buffer, leaving the saved return address on the stack reachable by attacker-controlled bytes. Embedded D-Link binaries of this generation are commonly compiled without modern mitigations such as stack canaries or address space layout randomization, which simplifies reliable exploitation.

Attack Vector

An attacker sends a crafted HTTP request to /dbsrv.asp with an oversized str parameter. Because the management interface listens on the network, the request can originate from any host that can reach the router, including the LAN, exposed WAN interfaces, or compromised internal systems. The exploitation flow is described in the public proof of concept on GitHub and cross-referenced in VulDB entry #283634. No synthetic exploit code is reproduced here; readers should consult the linked advisory for offset and payload specifics.

Detection Methods for CVE-2024-11048

Indicators of Compromise

• HTTP requests to /dbsrv.asp containing abnormally long str query or POST parameters
• Unexpected reboots, crashes, or restarts of the embedded web service on DI-8003 devices
• Outbound connections from the router to unfamiliar hosts following access to /dbsrv.asp
• New or modified administrative accounts, firewall rules, or DNS settings on affected routers

Detection Strategies

• Inspect HTTP traffic destined for the DI-8003 management interface for str parameter lengths exceeding expected bounds.
• Correlate authentication events to /dbsrv.asp with subsequent service crashes or configuration changes.
• Hunt for repeated POST or GET requests to /dbsrv.asp from a single source, which can indicate brute-force exploitation attempts.

Monitoring Recommendations

• Forward router syslog and web access logs to a centralized analytics platform for retention and querying.
• Alert on management-plane access from non-administrative source networks, including the WAN interface.
• Track firmware version and configuration drift across the DI-8003 fleet to identify unauthorized changes.

How to Mitigate CVE-2024-11048

Immediate Actions Required

• Restrict access to the DI-8003 web management interface to trusted management VLANs and disable WAN-side administration.
• Rotate credentials for all administrative accounts on affected devices and remove unused low-privilege accounts that could be abused.
• Block or rate-limit external requests to /dbsrv.asp at upstream perimeter devices until a patch is applied.
• Audit recent router configurations, DNS entries, and firewall rules for signs of unauthorized modification.

Patch Information

No vendor advisory or fixed firmware version is referenced in the published CVE data at this time. Monitor the D-Link official website for security bulletins and updated firmware addressing the dbsrv_asp buffer overflow. Until a patch is available, treat the device as exposed and apply compensating network controls.

Workarounds

• Place the DI-8003 behind a network segment that denies inbound HTTP/HTTPS traffic to the management interface from untrusted sources.
• Disable remote management features and require VPN access for administrative tasks.
• Replace end-of-support D-Link models with vendor-supported hardware where firmware updates are no longer published.

# Example: restrict access to the DI-8003 management interface using upstream firewall rules
# Allow only the management subnet to reach the router's web service
iptables -A FORWARD -s 10.10.10.0/24 -d <DI-8003-IP> -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d <DI-8003-IP> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <DI-8003-IP> -p tcp --dport 443 -j DROP