Description
A security flaw has been discovered in Totolink N300RH 6.1c.1353_B20190305. Affected by this vulnerability is the function setWebWlanIdx of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument webWlanIdx results in os command injection. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.
EPSS Score:
1%
Comprehensive Technical Analysis of EUVD-2026-9003
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2026-9003 affects the Totolink N300RH router, specifically version 6.1c.1353_B20190305. The flaw resides in the setWebWlanIdx function within the /cgi-bin/cstecgi.cgi file of the Web Management Interface. This vulnerability allows for OS command injection through manipulation of the webWlanIdx argument.
Severity Evaluation:
- Base Score: 9.3 (CVSS 4.0)
- Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
The high base score indicates a critical vulnerability due to the following factors:
- Attack Vector (AV:N): The vulnerability can be exploited remotely over the network.
- Attack Complexity (AC:L): The attack requires low complexity.
- Privileges Required (PR:N): No privileges are required to exploit the vulnerability.
- User Interaction (UI:N): No user interaction is required.
- Confidentiality (VC:H), Integrity (VI:H), Availability (VA:H): All three are highly impacted.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Remote Command Injection: An attacker can send specially crafted HTTP requests to the router's Web Management Interface, injecting malicious OS commands.
- Automated Exploitation: Given the public availability of the exploit, automated scripts or bots can be used to scan for and exploit vulnerable devices.
Exploitation Methods:
- Manipulation of
webWlanIdxArgument: By manipulating thewebWlanIdxargument in thesetWebWlanIdxfunction, an attacker can inject arbitrary OS commands. - Public Exploit Availability: The exploit is publicly available, increasing the risk of widespread attacks.
3. Affected Systems and Software Versions
Affected Systems:
- Totolink N300RH Router
- Firmware Version: 6.1c.1353_B20190305
Potential Impact:
- Home and Small Office Networks: These routers are commonly used in home and small office environments, making them attractive targets for attackers.
- IoT Devices: The router's vulnerability can be leveraged to compromise connected IoT devices.
4. Recommended Mitigation Strategies
Immediate Actions:
- Firmware Update: Users should immediately update the router firmware to a patched version if available.
- Network Segmentation: Isolate the router from critical networks to limit the potential impact of an attack.
- Firewall Rules: Implement strict firewall rules to restrict access to the Web Management Interface.
Long-Term Strategies:
- Regular Patching: Establish a regular patching schedule for all network devices.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activity.
- User Education: Educate users on the importance of updating firmware and maintaining strong network security practices.
5. Impact on European Cybersecurity Landscape
Regional Impact:
- Widespread Use: The Totolink N300RH router is widely used in Europe, making this vulnerability a significant threat.
- Critical Infrastructure: While primarily affecting home and small office networks, the potential for cascading effects on critical infrastructure cannot be ignored.
- Regulatory Compliance: Organizations must ensure compliance with EU regulations such as GDPR and NIS Directive, which mandate strong cybersecurity measures.
Cybersecurity Landscape:
- Increased Threat Surface: The vulnerability adds to the growing threat surface of IoT and network devices.
- Public Awareness: Highlights the need for increased public awareness and education on cybersecurity best practices.
6. Technical Details for Security Professionals
Vulnerability Details:
- Function:
setWebWlanIdx - File:
/cgi-bin/cstecgi.cgi - Component: Web Management Interface
- Manipulation Point:
webWlanIdxargument
Exploit Details:
- Public Exploit: Available at GitHub
- Exploit Type: OS Command Injection
References:
Conclusion: The vulnerability EUVD-2026-9003 poses a significant risk to users of the Totolink N300RH router. Immediate mitigation steps, including firmware updates and network segmentation, are crucial. The European cybersecurity landscape must adapt to address the growing threat of IoT and network device vulnerabilities, emphasizing the importance of regular patching and strong security practices.