CVE-2024-45694 Overview
The web service of certain D-Link wireless router models contains a Stack-based Buffer Overflow vulnerability (CWE-121), which allows unauthenticated remote attackers to exploit this vulnerability to execute arbitrary code on the device. This critical firmware vulnerability affects the DIR-X5460 and DIR-X4860 wireless router product lines, exposing home and small business networks to complete device compromise without requiring authentication.
Critical Impact
Unauthenticated remote attackers can achieve arbitrary code execution on affected D-Link routers, potentially gaining full control of the device and pivoting to attack internal network resources.
Affected Products
- D-Link DIR-X5460 (Hardware Revision A1) with Firmware versions 1.01, 1.02, 1.04, and 1.10
- D-Link DIR-X4860 (Hardware Revision A1) with Firmware versions 1.00 and 1.04
- D-Link DIR-X5460 Firmware
- D-Link DIR-X4860 Firmware
Discovery Timeline
- 2024-09-16 - CVE-2024-45694 published to NVD
- 2024-09-17 - Last updated in NVD database
Technical Details for CVE-2024-45694
Vulnerability Analysis
This vulnerability is classified as a Stack-based Buffer Overflow (CWE-121), a memory corruption flaw that occurs when user-supplied data is copied to a fixed-size stack buffer without proper bounds checking. In the context of the D-Link router web service, this allows an attacker to overwrite adjacent memory on the stack, including critical values such as saved return addresses and function pointers.
The attack can be initiated remotely over the network without any authentication requirements, and no user interaction is necessary for successful exploitation. An attacker who successfully exploits this vulnerability gains complete control over the affected device with the ability to execute arbitrary code, potentially leading to full device compromise, installation of persistent backdoors, or use of the router as a pivot point for further network attacks.
Root Cause
The root cause of CVE-2024-45694 lies in improper input validation within the web service component of the affected D-Link router firmware. When processing HTTP requests, the web service fails to properly validate the length of user-supplied input before copying it to a stack-allocated buffer. This boundary condition error allows an attacker to provide oversized input that exceeds the buffer's allocated space, corrupting adjacent stack memory and enabling control flow hijacking.
Attack Vector
The vulnerability is exploited via the network attack vector, specifically through the router's web management interface. An unauthenticated attacker can craft malicious HTTP requests containing oversized data fields that overflow the vulnerable stack buffer. By carefully constructing the overflow payload, the attacker can overwrite the saved return address on the stack, redirecting program execution to attacker-controlled code or existing executable sequences (ROP gadgets) within the firmware.
The exploitation process typically involves:
- Identifying the vulnerable web service endpoint that processes user input without bounds checking
- Crafting a malicious HTTP request with payload data exceeding the expected buffer size
- Overwriting the return address with a value pointing to attacker-controlled shellcode or existing code sequences
- Achieving arbitrary code execution with the privileges of the web service process
For detailed technical analysis, refer to the TW-CERT Security Advisory.
Detection Methods for CVE-2024-45694
Indicators of Compromise
- Unexpected outbound connections from the router to unknown IP addresses, particularly on non-standard ports
- Unusual CPU or memory utilization on the router device
- Modified firmware configuration or unauthorized administrative accounts
- Anomalous HTTP requests to the router's web management interface containing excessively long parameters
- Evidence of crash dumps or service restarts in router logs indicating exploitation attempts
Detection Strategies
- Monitor network traffic for suspicious HTTP requests targeting D-Link router management interfaces with unusually large payloads
- Implement network-based intrusion detection rules to identify buffer overflow exploitation patterns
- Deploy SentinelOne Singularity for network visibility to detect lateral movement from compromised IoT devices
- Review router access logs for unauthorized access attempts or anomalous authentication patterns
Monitoring Recommendations
- Enable verbose logging on affected D-Link routers if available, and forward logs to a centralized SIEM
- Establish baseline network behavior for router devices and alert on deviations
- Monitor for firmware integrity changes using periodic hash verification
- Implement network segmentation monitoring to detect potential pivot attempts from compromised routers
How to Mitigate CVE-2024-45694
Immediate Actions Required
- Check if your D-Link router model (DIR-X5460 or DIR-X4860) and firmware version are affected by reviewing the TW-CERT advisory
- Restrict access to the router's web management interface to trusted internal networks only
- Disable remote management features if not required for your deployment
- Implement network segmentation to isolate IoT devices from critical network assets
- Monitor for and apply firmware updates from D-Link as they become available
Patch Information
Organizations should monitor D-Link's official support channels for firmware updates addressing CVE-2024-45694. Given the critical severity of this vulnerability, firmware updates should be applied immediately upon release. Users are advised to regularly check for security advisories from both D-Link and TW-CERT for the latest patch information.
Workarounds
- Disable the web management interface entirely if not required for day-to-day operations
- Restrict web management access using firewall rules to allow only specific trusted IP addresses
- Place the router behind an additional firewall or security appliance that can filter malicious HTTP requests
- Consider replacing affected devices with models that have received security patches or are not vulnerable
- Enable MAC address filtering as an additional access control layer for management interfaces
# Example firewall rule to restrict web management access (adjust for your environment)
# Block external access to router management port 80/443
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
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
