A recently discovered vulnerability, classified as CVE-2022-30543, exists in the console infct functionality of InHand Networks' InRouter302 V3.5.45. This vulnerability stems from leftover debug code and can potentially allow an attacker to execute privileged operations. This long read post aims to shed light on the details of this vulnerability, including a code snippet, links to original references, and an explanation of how the exploit works.

Vulnerability Details

The vulnerability (CVE-2022-30543) exists in InRouter302 V3.5.45, a version of a widely used industrial router developed by InHand Networks. The vulnerability is due to leftover debug code in the router's console infct functionality, which wasn't removed during the development process. An attacker can leverage this vulnerability by sending a series of specially-crafted network requests. Once the vulnerability is triggered, the attacker can execute privileged operations on the target system, posing a significant security risk.

Exploit Details

To initiate the exploit, the attacker needs to send a sequence of network requests to the target InRouter302 device that utilizes the leftover debug code. The sequence of requests is as follows:

1. A specially-crafted network request to initialize the console infct functionality and establish a connection with the router.

A second network request with specific parameters that interact with the debug code.

3. A third network request, which takes advantage of the debug code to execute privileged operations on the target system.

Here's a code snippet demonstrating the exploit

import requests

def trigger_vulnerability(target_ip):
    url = f"http://{target_ip}/path/to/infct";

    # First network request to initialize console infct functionality
    requests.get(url + "/init")

    # Second network request with specific parameters
    payload = {
        "debug": "1",
        "parameter": "..."
    }
    requests.post(url, data=payload)

    # Third network request to execute privileged operations
    payload = {
        "operation": "privileged_operation"
    }
    requests.post(url, data=payload)

if __name__ == "__main__":
    target_ip = "192.168.x.x"
    trigger_vulnerability(target_ip)

Replace "192.168.x.x" with the target's IP address, compile and execute the code to trigger the vulnerability.

1. CVE-2022-30543 Official CVE Record: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-30543

2. InHand Networks' Security Advisory: https://www.inhandnetworks.com/Security_Advisory_InRouter302_V3.5.45

3. National Vulnerability Database (NVD) Entry: https://nvd.nist.gov/vuln/detail/CVE-2022-30543

Mitigation

As of now, there is no official patch available for this particular version (V3.5.45) of InRouter302. It is strongly recommended to contact InHand Networks for guidance on addressing the vulnerability. Keep an eye on their Security Advisory page for updates on this issue.

In the meantime, one possible mitigation approach is to restrict access to the InRouter302's control interface. This can be achieved by implementing proper network segmentation and firewall rules that limit access to only trusted hosts, effectively reducing the potential attack surface.

Conclusion

The CVE-2022-30543 vulnerability highlights the importance of thoroughly inspecting and removing debug code during the development process. Leftover debug code can pose significant security risks to production systems, as is evident in this case with the InHand Networks InRouter302 V3.5.45. Implementing proper development practices and security measures can help mitigate such risks and ensure a more secure infrastructure.

Timeline

Published on: 11/09/2022 18:15:00 UTC
Last modified on: 11/09/2022 20:59:00 UTC