Description
WRH-733GBK and WRH-733GWH contain an improper neutralization of special elements used in an OS command ('OS Command Injection') vulnerability in the telnet function. If a remote unauthenticated attacker sends a specially crafted request to the affected product, an arbitrary OS command may be executed.
EPSS Score:
1%
Comprehensive Technical Analysis of EUVD-2025-18997
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2025-18997 pertains to an OS command injection flaw in the telnet function of WRH-733GBK and WRH-733GWH devices. This vulnerability allows a remote, unauthenticated attacker to execute arbitrary OS commands by sending a specially crafted request. The severity of this vulnerability is rated with a CVSS Base Score of 9.8, indicating a critical risk.
CVSS Vector Breakdown:
- Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
- Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources to execute.
- Privileges Required (PR): None (N) - No authentication is required to exploit the vulnerability.
- User Interaction (UI): None (N) - No user interaction is required for the attack to succeed.
- Scope (S): Unchanged (U) - The vulnerability affects the same security scope.
- Confidentiality (C): High (H) - The vulnerability can lead to a significant breach of confidentiality.
- Integrity (I): High (H) - The vulnerability can lead to a significant breach of integrity.
- Availability (A): High (H) - The vulnerability can lead to a significant breach of 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.
- Unauthenticated Access: The attacker does not need any credentials to exploit the vulnerability.
Exploitation Methods:
- Crafted Telnet Requests: The attacker can send specially crafted telnet requests that include malicious OS commands.
- Automated Scripts: Attackers can use automated scripts to scan for vulnerable devices and execute commands en masse.
3. Affected Systems and Software Versions
Affected Products:
- WRH-733GBK: All versions
- WRH-733GWH: All versions
Vendor:
- ELECOM CO.,LTD.
4. Recommended Mitigation Strategies
Immediate Actions:
- Disable Telnet: Immediately disable the telnet service on affected devices to prevent remote exploitation.
- Network Segmentation: Implement network segmentation to isolate affected devices from critical systems.
- Firewall Rules: Apply strict firewall rules to block unauthorized access to the telnet port.
Long-Term Solutions:
- Patch Management: Apply vendor-provided patches or updates as soon as they are available.
- Use Secure Protocols: Transition to more secure remote management protocols such as SSH.
- Regular Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.
5. Impact on European Cybersecurity Landscape
The presence of this vulnerability in widely used devices poses a significant risk to the European cybersecurity landscape. Organizations and individuals using the affected devices are at risk of unauthorized access, data breaches, and potential disruption of services. The high severity score and the ease of exploitation make this vulnerability a prime target for cybercriminals, potentially leading to widespread attacks.
6. Technical Details for Security Professionals
Vulnerability Details:
- Type: OS Command Injection
- Affected Function: Telnet
- Exploitation: Remote, unauthenticated attacker can execute arbitrary OS commands.
Detection and Monitoring:
- Log Analysis: Monitor telnet logs for unusual or unauthorized access attempts.
- Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious telnet activity.
- Network Traffic Analysis: Use network traffic analysis tools to identify and block malicious telnet requests.
Incident Response:
- Containment: Isolate affected devices from the network to prevent further exploitation.
- Eradication: Apply patches and updates to mitigate the vulnerability.
- Recovery: Restore affected systems to a secure state and ensure no backdoors or malicious software remain.
References:
By following these recommendations and staying vigilant, organizations can significantly reduce the risk posed by this critical vulnerability.