CVE-2024-9534 Overview
CVE-2024-9534 is a buffer overflow vulnerability in the D-Link DIR-605L router firmware version 2.13B01 BETA. The flaw resides in the formEasySetPassword function within /goform/formEasySetPassword, where the curTime argument is not properly validated before being copied into a fixed-size buffer. Remote attackers with low-level privileges can exploit the issue over the network to trigger memory corruption. The exploit details have been publicly disclosed, increasing the likelihood of opportunistic targeting.
Critical Impact
Successful exploitation can corrupt memory on affected D-Link DIR-605L routers, enabling attackers to compromise device confidentiality, integrity, and availability across networked deployments.
Affected Products
- D-Link DIR-605L router (hardware)
- D-Link DIR-605L firmware version 2.13B01 BETA
- Deployments exposing the router web management interface /goform/formEasySetPassword
Discovery Timeline
- 2024-10-05 - CVE-2024-9534 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in the NVD database
Technical Details for CVE-2024-9534
Vulnerability Analysis
The vulnerability is a classic stack-based buffer overflow classified under CWE-120 (Buffer Copy without Checking Size of Input). The formEasySetPassword handler processes the curTime parameter submitted through the router's web management interface. The function copies attacker-controlled data into a fixed-size buffer without validating the length of the input. Because the parameter is passed directly from an HTTP request to the vulnerable routine, an attacker can overwrite adjacent stack memory, including saved return addresses. This can lead to a denial of service condition or, depending on device protections, arbitrary code execution on the router's MIPS-based firmware.
Root Cause
The root cause is missing bounds checking within the formEasySetPassword function. The router firmware trusts the length of the curTime argument sent by the client and passes it to an unsafe string copy routine. No length enforcement or sanitization occurs before writing user input into the destination buffer.
Attack Vector
Exploitation requires network access to the router's HTTP administration interface and low-level authentication. An attacker sends a crafted POST request to /goform/formEasySetPassword containing an oversized curTime parameter. The malformed request corrupts the stack, allowing the attacker to hijack execution flow. Devices exposed to untrusted networks or reachable through the WAN interface face the highest risk. See the GitHub IoT Vulnerability Documentation for the technical proof of concept.
// No verified exploit code is published in the enriched dataset.
// Refer to the linked GitHub documentation and VulDB entry #279240 for technical details.
Detection Methods for CVE-2024-9534
Indicators of Compromise
- Unexpected POST requests to /goform/formEasySetPassword containing abnormally long curTime parameter values.
- Router web service crashes, reboots, or repeated administrative session terminations without operator action.
- Unauthorized configuration changes on the DIR-605L, particularly around administrative credentials or WAN settings.
Detection Strategies
- Inspect HTTP request bodies destined for the router management interface for curTime values exceeding expected timestamp lengths.
- Correlate router syslog messages with authentication events to identify low-privileged sessions issuing unusual /goform/ requests.
- Alert on repeated malformed HTTP requests targeting D-Link formEasySetPassword endpoints from a single source.
Monitoring Recommendations
- Forward router logs and administrative access records to a centralized SIEM for retention and correlation.
- Monitor network traffic for scans targeting D-Link web management paths and /goform/ endpoints on TCP/80 and TCP/443.
- Track firmware version inventory across networking assets to identify DIR-605L devices running the affected 2.13B01 BETA build.
How to Mitigate CVE-2024-9534
Immediate Actions Required
- Restrict access to the DIR-605L web administration interface to trusted management VLANs only.
- Disable remote (WAN-side) administration on all affected DIR-605L devices.
- Rotate router administrative credentials and enforce strong, unique passwords to limit low-privilege exploitation.
- Isolate legacy DIR-605L devices from sensitive network segments until a vendor fix is applied.
Patch Information
No vendor advisory or firmware patch was referenced in the enriched CVE data. The DIR-605L is a legacy consumer product, and organizations should consult the D-Link Official Website for end-of-life status and any updated firmware releases. Where a patch is unavailable, plan device replacement with a currently supported router platform.
Workarounds
- Place the router behind an upstream firewall that blocks inbound access to management ports from untrusted networks.
- Apply access control lists (ACLs) that restrict /goform/formEasySetPassword requests to specific administrative source IPs.
- Retire and replace end-of-life DIR-605L hardware where feasible to eliminate exposure.
# Example: block WAN-side access to the router management interface using an upstream firewall
iptables -A FORWARD -i wan0 -p tcp --dport 80 -j DROP
iptables -A FORWARD -i wan0 -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
