Remote Code Execution in Generic OEM UZ801_v2.1 4G LTE Router

Executive Summary

This vulnerability exists in the Generic OEM UZ801_v2.1 4G LTE Router V3.4.3. It allows a remote attacker to execute arbitrary code by exploiting the /ajax web management API endpoint in the MifiService.apk component.

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Impact Analysis

An attacker exploiting this vulnerability could remotely execute arbitrary code on the affected router, potentially gaining unauthorized control over the device. This could lead to disruption of network services, interception or manipulation of data, or using the device as a foothold for further attacks.

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Compliance Impact

This vulnerability allows unauthorized remote attackers to access and modify sensitive device information and configurations without authentication. Such unauthorized access and potential data exposure can lead to violations of data protection and privacy regulations like GDPR and HIPAA, which require strict controls over access to personal and sensitive information.

Specifically, the extraction of sensitive information such as Wi-Fi passwords, IMEI, firmware details, SIM status, and network configurations could result in breaches of confidentiality and integrity requirements mandated by these standards.

Furthermore, the lack of proper access controls and authentication mechanisms contradicts the security principles required for compliance, potentially exposing organizations using this device to regulatory penalties and increased risk of data breaches.

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Detection Guidance

This vulnerability can be detected by checking for unauthorized access to the /ajax web management API endpoint on the affected device, typically accessible at http://192.168.100.1/ajax.

You can attempt to access this endpoint without authentication to see if sensitive information such as Wi-Fi passwords, IMEI, firmware details, SIM status, network configuration, DHCP settings, or MAC filter rules can be retrieved.

Network scanning tools or curl commands can be used to test the endpoint. For example, using curl to send a request to the endpoint:

• curl http://192.168.100.1/ajax

If the response contains sensitive information or allows configuration changes without authentication, the device is vulnerable.

Additionally, monitoring network traffic for unauthorized requests to the /ajax endpoint from adjacent network devices can help detect exploitation attempts.

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Mitigation Strategies

Immediate mitigation steps include enforcing authenticated sessions for access to the /ajax web management API endpoint to prevent unauthorized use.

Removing or disabling undocumented or unnecessary endpoints such as /ajax can reduce the attack surface.

Implementing proper Cross-Site Request Forgery (CSRF) protections and validating Origin/Referer headers can help prevent browser-based exploitation.

Restricting network access to the management interface to trusted users or networks and applying network segmentation can limit exposure.

If possible, update the device firmware or software to a version that addresses these access control issues.

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