D-Link DIR-859 Router hedwig.cgi Path Traversal and Remote Code Execution Vulnerability (CVE-2024-0769)
Executive & SecOps Summary
SECOPS ASSESSMENTD-Link DIR-859 router firmware version 1.06B01 and prior.
Unauthenticated remote attackers can exploit this vulnerability to read sensitive system configuration files and potentially gain full administrative control over the device.
This product is End-of-Life (EOL) and will not receive official security patches; immediate retirement and replacement of the device is strongly recommended.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Because the D-Link DIR-859 router has reached its End-of-Life (EOL) cycle, the vendor will not release any official security patches to address this vulnerability. The only effective remediation is to retire the device immediately and replace it with a modern, actively supported model.
2. Temporary Workaround & Hardening Configuration
If immediate replacement is not feasible, disable WAN-side remote management access entirely. You can also deploy an upstream reverse proxy (e.g., Nginx) to block malicious requests targeting the vulnerable endpoint:
# Block external access to the vulnerable hedwig.cgi endpoint
server {
listen 80;
server_name internal-router.local;
location /hedwig.cgi {
deny all;
return 403 'Access Denied: EOL Device Protection';
}
}3. Log Audit & IoC Verification Commands
Use the following Bash script to scan web server access logs for potential exploitation attempts targeting the /hedwig.cgi endpoint:
#!/bin/bash
# Scan access logs for CVE-2024-0769 exploitation patterns
LOG_FILE='/var/log/nginx/access.log'
echo '[+] Scanning for CVE-2024-0769 Path Traversal attempts...'
grep -i 'hedwig.cgi' "$LOG_FILE" | grep -E '\.\./|getcfg' > /tmp/detected_attacks.log
if [ -s /tmp/detected_attacks.log ]; then
echo '[!] WARNING: Potential exploitation attempts detected!'
cat /tmp/detected_attacks.log
else
echo '[+] No suspicious hedwig.cgi requests found.'
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2024-0769) is a critical Path Traversal vulnerability (CWE-22) located within the /hedwig.cgi component of the D-Link DIR-859 router, which handles HTTP POST requests. The root cause lies in the insufficient validation and sanitization of the service parameter. By supplying directory traversal sequences (e.g., ../../../../), an attacker can bypass directory restrictions and access arbitrary files on the filesystem.
2. Exploitation Mechanics & Attack Scenario
An attacker sends a crafted HTTP POST request targeting /hedwig.cgi. By manipulating the service argument to point to a sensitive configuration file, such as ../../../../htdocs/webinc/getcfg/DHCPS6.BRIDGE-1.xml, the web server processes the request and returns the contents of the specified XML file. This allows unauthenticated remote attackers to extract sensitive network configurations and administrative credentials, which can be leveraged to achieve full remote code execution (RCE).
3. Infrastructure & Business Impact
With a CVSS score of 9.8 (Critical) and its inclusion in the CISA KEV catalog, this vulnerability poses an immediate threat as it is actively exploited in the wild. Compromised routers can be utilized by threat actors as entry points for lateral movement into internal corporate networks, or enlisted into malicious botnets (such as Mirai) to launch large-scale Distributed Denial of Service (DDoS) attacks.
Official Vendor Advisories & References
** UNSUPPORTED WHEN ASSIGNED ** A vulnerability was found in D-Link DIR-859 1.06B01. It has been rated as critical. Affected by this issue is some unknown functionality of the file /hedwig.cgi of the component HTTP POST Request Handler. The manipulation of the argument service with the input ../../../../htdocs/webinc/getcfg/DHCPS6.BRIDGE-1.xml leads to path traversal. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. VDB-251666 is the identifier assigned to this vulnerability. NOTE: This vulnerability only affects products that are no longer supported by the maintainer. NOTE: Vendor was contacted early and confirmed immediately that the product is end-of-life. It should be retired and replaced.
Frequently Asked SecOps Questions (CVE-2024-0769)
FAQQ1. How critical is CVE-2024-0769 and is it actively exploited in the wild?
CVE-2024-0769 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 82.7%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2024-0769?
Primary impacted vendors include d-link across dir-859. Scope summary: All firmware versions of D-Link DIR-859, including version 1.06B01, which are now End-of-Life (EOL).
Q3. What temporary mitigations or workarounds exist for CVE-2024-0769 before patching?
[Mitigation] This product is End-of-Life (EOL) and will not receive official security patches; immediate retirement and replacement of the device is strongly recommended. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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