CVE-2024-54807

Comprehensive Technical Analysis of CVE-2024-54807

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2024-54807 CVSS Score: 9.8

The vulnerability in the Netgear WNR854T 1.5.2 (North America) router involves a command injection flaw in the UPNP service, specifically within the addmap_exec function. This function processes the NewInternalClient parameter of the AddPortMapping SOAPAction without proper sanitation, leading to arbitrary command execution.

Severity Evaluation:

• CVSS Score: 9.8 (Critical)
• Impact: High
• Exploitability: High

The high CVSS score indicates a critical vulnerability that can be easily exploited with severe consequences. The lack of input sanitation allows attackers to execute arbitrary commands on the affected device, potentially leading to full system compromise.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can send a specially crafted SOAPAction request for AddPortMapping via the router's WANIPConn1 service. This can be done remotely if the UPNP service is exposed to the internet.
• Local Network Exploitation: An attacker within the local network can also exploit this vulnerability by sending the malicious request to the router.

Exploitation Methods:

• Command Injection: The attacker can inject malicious commands into the NewInternalClient parameter, which are then executed by the system without proper sanitation.
• SOAPAction Manipulation: The attacker manipulates the AddPortMapping SOAPAction to include malicious commands, leading to arbitrary command execution on the router.

3. Affected Systems and Software Versions

Affected Systems:

• Netgear WNR854T router

Affected Software Versions:

• Firmware version 1.5.2 (North America)

It is crucial to note that other versions and regions might also be affected, but this specific CVE pertains to the mentioned version and region.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Disable UPNP: Immediately disable the UPNP service on the router to prevent remote exploitation.
• Network Segmentation: Implement network segmentation to isolate the router from critical systems.
• Firewall Rules: Configure firewall rules to block unsolicited incoming traffic to the UPNP service.

Long-Term Mitigation:

• Firmware Update: Apply the latest firmware update from Netgear that addresses this vulnerability.
• Regular Patching: Implement a regular patching and update schedule for all network devices.
• Monitoring and Logging: Enable and monitor logging for suspicious activities related to the UPNP service.

5. Impact on Cybersecurity Landscape

The discovery of this vulnerability highlights the ongoing risks associated with IoT devices and home routers. The critical nature of the vulnerability underscores the importance of robust input validation and sanitation in network services. It also emphasizes the need for continuous monitoring and timely patching of network devices to mitigate potential threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function: addmap_exec
• Parameter: NewInternalClient
• Service: UPNP (WANIPConn1)
• SOAPAction: AddPortMapping

Exploitation Steps:

1. Craft Malicious Request: Create a SOAPAction request for AddPortMapping with a malicious payload in the NewInternalClient parameter.
2. Send Request: Send the crafted request to the router's UPNP service.
3. Command Execution: The router processes the request, leading to arbitrary command execution due to the lack of input sanitation.

Detection and Response:

• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious UPNP traffic.
• Log Analysis: Regularly analyze logs for unusual activities related to the UPNP service.
• Incident Response: Have an incident response plan in place to quickly address and mitigate any detected exploitation attempts.

Conclusion: CVE-2024-54807 represents a critical vulnerability in the Netgear WNR854T router that can be exploited for arbitrary command execution. Immediate mitigation steps include disabling UPNP and applying firmware updates. Long-term strategies involve regular patching, monitoring, and robust network security practices to protect against similar vulnerabilities in the future.