Description
D-Link Go-RT-AC750 revA_v101b03 was discovered to contain a command injection vulnerability via the service parameter at genacgi_main.
EPSS Score:
22%
Comprehensive Technical Analysis of EUVD-2023-38841
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2023-38841, also known as CVE-2023-34800, affects the D-Link Go-RT-AC750 router, specifically revision A with firmware version v101b03. The vulnerability is classified as a command injection flaw via the service parameter at genacgi_main.
Severity Evaluation:
- Base Score: 9.8 (CVSS:3.1)
- Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The high base score of 9.8 indicates a critical vulnerability. The CVSS vector string breaks down as follows:
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): High (H)
This means the vulnerability can be exploited remotely with low complexity, requiring no privileges or user interaction, and can lead to high impacts on confidentiality, integrity, and availability.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Remote Exploitation: An attacker can exploit this vulnerability over the network without needing physical access to the device.
- Command Injection: The attacker can inject malicious commands through the
serviceparameter, leading to arbitrary command execution on the device.
Exploitation Methods:
- Unauthenticated Access: Since the vulnerability requires no privileges, an attacker can exploit it without needing to authenticate.
- Payload Delivery: The attacker can craft a specially designed HTTP request to the
genacgi_mainendpoint, injecting commands that the router will execute.
3. Affected Systems and Software Versions
Affected Systems:
- D-Link Go-RT-AC750 router
- Firmware version: v101b03
Software Versions:
- The vulnerability specifically affects revision A of the D-Link Go-RT-AC750 with firmware version v101b03.
4. Recommended Mitigation Strategies
Immediate Mitigation:
- Firmware Update: Users should immediately update the firmware to the latest version provided by D-Link.
- Network Segmentation: Isolate the affected device from critical networks to limit potential damage.
- Firewall Rules: Implement strict firewall rules to restrict access to the router's management interface.
Long-Term Mitigation:
- Regular Patching: Ensure that all network devices are regularly updated with the latest security patches.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities and potential exploitation attempts.
- Access Control: Implement strong access control measures, including multi-factor authentication (MFA) where possible.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to European cybersecurity, particularly for organizations and individuals using the affected D-Link router. Given the critical nature of the vulnerability, it could be exploited to gain unauthorized access to networks, exfiltrate sensitive data, and disrupt network operations. The widespread use of such routers in both residential and small business environments amplifies the potential impact.
6. Technical Details for Security Professionals
Vulnerability Details:
- Command Injection: The
serviceparameter ingenacgi_maindoes not properly sanitize user input, allowing an attacker to inject arbitrary commands. - Exploitation: An attacker can send a crafted HTTP request to the router's management interface, injecting commands that will be executed with the privileges of the router's operating system.
Example Exploit:
POST /genacgi_main HTTP/1.1
Host: [router_ip]
Content-Type: application/x-www-form-urlencoded
service=`command_to_inject`
Detection:
- Log Analysis: Monitor router logs for unusual command execution or unexpected network traffic.
- Network Monitoring: Use network monitoring tools to detect anomalous traffic patterns indicative of command injection attempts.
Response:
- Incident Response Plan: Develop and implement an incident response plan tailored to IoT devices, including routers.
- Patch Management: Ensure a robust patch management process is in place to quickly apply security updates.
References:
By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk and protect their networks from potential exploitation.