Executive Summary

The eNet SMART HOME server versions 2.2.1 and 2.3.1 have a privilege escalation vulnerability caused by insufficient authorization checks in the setUserGroup JSON-RPC method.

A low-privileged user (UG_USER) can exploit this by sending a specially crafted POST request to the /jsonrpc/management endpoint, specifying their own username to elevate their account to the UG_ADMIN group.

This bypasses the intended access controls and grants the attacker administrative capabilities, such as modifying device configurations, network settings, and other smart home system functions.

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Impact Analysis

Exploiting this vulnerability allows an attacker with low privileges to gain full administrative rights on the eNet SMART HOME server.

• Modify device configurations
• Alter network settings
• Potentially compromise the entire smart home ecosystem managed by the server

This can lead to unauthorized control over smart home devices and settings, posing significant security and privacy risks.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': "This vulnerability can be detected by monitoring for suspicious POST requests to the /jsonrpc/management endpoint, specifically those invoking the setUserGroup JSON-RPC method with parameters that attempt to elevate a user's group to UG_ADMIN."}, {'type': 'paragraph', 'content': 'A detection approach could involve inspecting network traffic or server logs for crafted POST requests that include the username parameter and the UG_ADMIN group assignment.'}, {'type': 'paragraph', 'content': 'For example, using command-line tools like curl or tcpdump to capture and analyze traffic, or grep to search logs for relevant JSON-RPC calls, might help identify exploitation attempts.'}, {'type': 'list_item', 'content': 'Use tcpdump or Wireshark to capture HTTP POST requests to /jsonrpc/management.'}, {'type': 'list_item', 'content': 'Search server access logs for POST requests containing "setUserGroup" and "UG_ADMIN" keywords, e.g., grep \'setUserGroup\' /var/log/nginx/access.log | grep \'UG_ADMIN\'.'}, {'type': 'list_item', 'content': 'Use curl to test the endpoint manually by sending a crafted POST request to see if privilege escalation is possible (only in a controlled, authorized environment).'}] [1]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the /jsonrpc/management endpoint to trusted users only and implementing additional authorization checks to prevent unauthorized privilege escalation.

If possible, disable or restrict the setUserGroup JSON-RPC method until a patch or update is applied.

Monitor and block suspicious POST requests attempting to change user groups, especially those elevating privileges to UG_ADMIN.

Contact the vendor for patches or updates addressing this vulnerability and apply them as soon as they become available.

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