Executive Summary

This vulnerability is a command injection flaw in the D-Link DI-7100G C1 router's jhttpd service, specifically in the function sub_46409C accessed via the /msp_info.htm?flag=qos endpoint. It occurs because the 'iface' parameter is not properly sanitized, allowing an attacker to inject arbitrary system commands remotely. This can be exploited by an attacker with some level of authentication to execute commands on the device. [1, 2]

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Impact Analysis

The vulnerability can impact the confidentiality, integrity, and availability of the affected device. An attacker exploiting this flaw can execute arbitrary commands remotely, potentially taking control of the device, disrupting its operation, or accessing sensitive information. The attack is considered easy to execute and a proof-of-concept exploit is publicly available. [2]

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Detection Guidance

This vulnerability can be detected by monitoring or testing the jhttpd service on the D-Link DI-7100G C1 device, specifically by checking the /msp_info.htm endpoint with the query parameter flag=qos and the iface argument for signs of command injection. Since the vulnerability involves command injection via the iface parameter, one could attempt to send crafted requests to this endpoint to observe unexpected command execution or responses. However, no specific detection commands are provided in the available resources. [1, 2]

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Mitigation Strategies

Immediate mitigation steps include replacing the affected D-Link DI-7100G C1 device with an alternative product, as no known mitigations or countermeasures have been identified. Since the vulnerability allows remote command injection and exploitation is easy, avoiding use of the vulnerable device or restricting access to the jhttpd service endpoint may reduce risk until replacement is possible. [2]

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