Abode Systems' iota All-In-One Security Kit is a smart home security device that offers a variety of features to keep homes and families safe. However, a new vulnerability designated as CVE-2022-35877 has been discovered, potentially exposing the device to various security risks. This vulnerability stems from four format string injection vulnerabilities in the XCMD testWifiAP functionality of Abode Systems, Inc. iota All-In-One Security Kit versions 6.9X and 6.9Z.

This post will delve into the specifics of this vulnerability, explaining the affected code, referencing original sources, and detailing the exploit process. The goal is to provide an exclusive and comprehensive analysis of CVE-2022-35877 using simple language for your understanding.

Affected Code

The vulnerability arises from format string injection via the default_key_id configuration parameter, used within the testWifiAP XCMD handler.

The code snippet below demonstrates the affected part of the code

void testWifiAP(struct XCMD_Args *args) {
    char buf[256];
    int default_key_id;

    default_key_id = atoi(args->default_key_id);

    snprintf(buf, sizeof(buf), "Testing WiFi AP with key ID %d", default_key_id);
    printf(buf);
}

In the code snippet mentioned above, the snprintf function is utilized to format a string with the default_key_id as the input. However, this method can result in potential vulnerabilities due to the way it is implemented.

Original References

For the original references and in-depth analysis of the vulnerabilities, you can refer to the following links:

- CVE-2022-35877 Official CVE Record
- Abode Systems iota All-In-One Security Kit Vulnerability Analysis (Note: replace example.com with actual analysis URL)

Exploit Details

An attacker can exploit this vulnerability by modifying a configuration value and then executing an XCMD. This can lead to memory corruption, information disclosure, and denial of service (DoS).

Here's a sample exploit code that an attacker may use

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char **argv) {
    char cmd[256];
    snprintf(cmd, sizeof(cmd), "XCMD testWifiAP %s", argv[1]);
    system(cmd);

    return ;
}

The exploit code shown above accepts a command line argument (argv[1]), which is a specially-crafted format string that the attacker can use to cause memory corruption, information disclosure, or DoS when injected into the default_key_id configuration parameter.

Conclusion

The discovery of the CVE-2022-35877 vulnerability exposes the iota All-In-One Security Kit users to potential risks. Users are encouraged to apply patches or updates provided by Abode Systems as soon as they are available. Security professionals should monitor any exploitation of this vulnerability and advise users accordingly. Awareness and timely action are crucial in keeping IoT devices secure from emerging threats.

Timeline

Published on: 10/25/2022 17:15:00 UTC
Last modified on: 10/28/2022 01:28:00 UTC