CVE-2024-9570 Overview
CVE-2024-9570 is a buffer overflow vulnerability in the D-Link DIR-619L B1 2.06 wireless router firmware. The flaw resides in the formEasySetTimezone function of the /goform/formEasySetTimezone endpoint. Attackers can trigger the overflow by manipulating the curTime argument, corrupting memory on the affected device. The vulnerability is remotely exploitable over the network and requires low privileges. Public disclosure of the exploit details increases the risk of opportunistic exploitation against exposed devices. The DIR-619L is an end-of-life consumer router, which limits vendor remediation options for affected users.
Critical Impact
Remote attackers with low privileges can trigger memory corruption in the router's web management interface, potentially leading to arbitrary code execution or device compromise.
Affected Products
- D-Link DIR-619L hardware (revision B1)
- D-Link DIR-619L firmware version 2.06
- Web management interface component handling /goform/formEasySetTimezone
Discovery Timeline
- 2024-10-07 - CVE-2024-9570 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-9570
Vulnerability Analysis
The vulnerability is a classic buffer overflow classified under [CWE-120] (Buffer Copy without Checking Size of Input). The affected function formEasySetTimezone processes HTTP requests submitted to /goform/formEasySetTimezone, which is part of the DIR-619L web administration interface used to configure the router's timezone.
When a request is submitted, the handler reads the curTime parameter from the request body and copies it into a fixed-size stack buffer without validating the length of the supplied data. An attacker who supplies a curTime value exceeding the buffer boundary overwrites adjacent stack memory, including saved return addresses.
Successful exploitation can compromise the confidentiality, integrity, and availability of the router. Because the web server on embedded D-Link routers typically runs with root-equivalent privileges, code execution through this flaw gives an attacker full control of the device.
Root Cause
The root cause is missing bounds checking on user-supplied input inside formEasySetTimezone. The handler copies the curTime value into a stack buffer using an unsafe string operation, with no length validation prior to the copy.
Attack Vector
The attack is delivered over the network to the router's HTTP management interface. The attacker must be authenticated with low-privilege credentials, then submits a crafted POST request to /goform/formEasySetTimezone with an oversized curTime value. No user interaction is required. See the GitHub vulnerability documentation for the technical writeup.
// No verified exploit code is published for CVE-2024-9570.
// Refer to the linked technical references for reproduction details.
Detection Methods for CVE-2024-9570
Indicators of Compromise
- HTTP POST requests to /goform/formEasySetTimezone containing abnormally long curTime parameter values.
- Unexpected reboots, crashes, or hangs of the DIR-619L web management daemon following inbound HTTP traffic.
- New or unexpected outbound connections from the router to unfamiliar hosts, suggesting post-exploitation activity.
Detection Strategies
- Inspect web server and firewall logs for requests targeting the /goform/formEasySetTimezone endpoint from untrusted sources.
- Deploy network IDS signatures that flag HTTP POST bodies with curTime parameters exceeding a reasonable timezone string length.
- Monitor router availability and administrative interface responsiveness for signs of memory corruption crashes.
Monitoring Recommendations
- Restrict and log all access attempts to the router's management interface from both LAN and WAN sides.
- Baseline normal administrative traffic patterns to the router and alert on anomalous request volumes or payload sizes.
- Track DNS queries and outbound sessions originating from the router itself for signs of implant activity.
How to Mitigate CVE-2024-9570
Immediate Actions Required
- Disable remote (WAN-side) administration on the DIR-619L so the vulnerable endpoint is not reachable from the internet.
- Change default and weak administrator credentials, since exploitation requires low-privilege authentication.
- Segment the router's management interface to a restricted VLAN or trusted management network.
- Plan replacement of the DIR-619L with a supported device, as the model is end-of-life and unlikely to receive a patch.
Patch Information
No vendor patch is referenced in the enriched CVE data. The D-Link DIR-619L is a legacy consumer router; users should consult the D-Link official website for end-of-life notices and replacement guidance. Additional tracking is available through VulDB entry #279464.
Workarounds
- Block inbound access to the router's HTTP administration interface from untrusted networks using upstream firewall rules.
- Limit LAN-side administrative access to specific, trusted management workstations by MAC or IP allowlist.
- Decommission the device and migrate to a router model that receives current firmware security updates.
# Example: block WAN-side access to the router's web admin port from an upstream firewall
iptables -A FORWARD -p tcp -d <router_wan_ip> --dport 80 -j DROP
iptables -A FORWARD -p tcp -d <router_wan_ip> --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
