With the proliferation of IoT devices in our homes and businesses, smart device security is of paramount importance. In this post, we'll be discussing a critical vulnerability found in OPTILINK OP-XT71000N hardware version V2.2 that allows for unauthenticated remote code execution. Identified as CVE-2020-23584, this exploit takes advantage of an attacker passing arbitrary commands to the device's IP address by using the " | " character to execute the commands on /diag_tracert_admin.asp while in the "PingTest" parameter.

To truly understand the implications of this vulnerability and how it can lead to unauthenticated remote code execution, we will take a detailed look at the exploit below.

Exploit Details

This specific vulnerability affects the /diag_tracert_admin.asp endpoint on the affected device. The code snippet posted below demonstrates the ease with which an attacker can pass arbitrary commands into the "PingTest" parameter (Check GitHub link for the actual code): 

import requests

url = 'http://[IP_ADDRESS]/diag_tracert_admin.asp';
data = {'PingTest': '127...1 | <YOUR_COMMAND>', 'Send': 'Ping'}

response = requests.post(url, data=data)
print(response.text)

Upon executing this command, an attacker can essentially gain control over the device by injecting and executing their own commands. This poses a significant risk to the security and integrity of the device and, by extension, the entire network or system it is connected to.

Original References

This vulnerability was initially discovered and reported by [INSERT_RESEARCHER_NAME/ORGANIZATION] in October 202. The complete details surrounding the exploit can be found on the researcher's website [LINK TO ORIGINAL WEBSITE] and the official CVE record available at [LINK TO CVE MITRE PAGE], both of which include vital information on the discovery, risk assessment, and potential mitigation strategies for this exploit.

CVE-2020-23584 Mitigation

The immediate mitigation method for users is to ensure that their network is properly segmented, isolating the affected OPTILINK devices from the wider network to prevent unauthorized access or code execution. It's also a good idea to implement proper network access control and restrict access to the device's management interface.

Until a patch is made available by the manufacturer, it's important to maintain a strong security posture and follow best practices such as changing default passwords, disabling unused features, and monitoring network traffic for any suspicious activity.

Conclusion

CVE-2020-23584 poses a significant threat to the security and privacy of OPTILINK OP-XT71000N users. By understanding the underlying exploit and taking appropriate mitigation steps, users can better protect their devices and networks. Stay vigilant and keep an eye out for any updates or patches from the manufacturer to resolve this critical issue.

Timeline

Published on: 11/23/2022 02:15:00 UTC
Last modified on: 11/23/2022 20:29:00 UTC