A newly discovered vulnerability, CVE-2022-33194, affects the Abode Systems, Inc. iota All-In-One Security Kit in versions 6.9X and 6.9Z. This security flaw is due to unsafe handling of the WL_Key and WL_DefaultKeyID configuration values in the XCMD testWifiAP functionality. Successful exploitation can result in arbitrary command execution by a malicious attacker.

This long-read post discusses the technical details of this vulnerability, including exploit analysis, code snippets, and links to original references. By the end of this post, you should have a comprehensive understanding of CVE-2022-33194 and its implications.

Background

The Abode Systems, Inc. iota All-In-One Security Kit is a wireless home security solution that helps protect homes from intrusion, fire, and water damage. However, four OS command injection vulnerabilities have been discovered in the XCMD testWifiAP functionality of the device.

Vulnerability Details

The vulnerabilities are found within the function located at the offset x1c7d28 of firmware version 6.9Z, and the command execution occurs at offset x1c7f6c. An attacker who sends a sequence of malicious commands to the affected device can cause arbitrary command execution.

The relevant code snippet at the offset x1c7d28 is as follows

if ( !v5 && !strncmp(curPtr, "WIRELESS=", 9uLL) )
{
  ...
  if ( !strncmp(curPtr, "WL_Key=", 7uLL) )
  {
    ...
  }
  else if ( !strncmp(curPtr, "WL_DefaultKeyID=", 16uLL) )
  {
    ...
  }
  ...
}

At offset x1c7f6c, the following command execution occurs

sprintf(v11, "WL_Key='%s';WL_DefaultKeyID='%s'; . /usr/sbin/testWifiAP.sh", &config_val1, &config_val2);
system(v11);

This command essentially concatenates the WL_Key and WL_DefaultKeyID values and passes them as shell commands to be executed by the system.

Exploit Analysis

An attacker can successfully exploit these vulnerabilities by crafting a sequence of malicious commands and injecting them into the WL_Key and WL_DefaultKeyID configuration values. The XCMD testWifiAP functionality would then carry out these malicious commands when it runs the affected code snippet.

For example, an attacker could inject the following command

\';rm -rf /;\'

This command would wipe the entire filesystem of the targeted device if successfully executed, rendering it inoperable.

Original References

- CVE-2022-33194 - NVD
- Abode Systems, Inc. iota All-In-One Security Kit Official Site

Conclusion

CVE-2022-33194 is a critical vulnerability present in the Abode Systems, Inc. iota All-In-One Security Kit versions 6.9X and 6.9Z. This vulnerability can lead to arbitrary command execution, and attackers can exploit it by sending a sequence of malicious commands.

It is advisable for users of the affected devices to update their firmware as soon as possible to mitigate this vulnerability. Additionally, users should remain vigilant about potential threats and keep their devices' software up-to-date to minimize security risks.

Timeline

Published on: 10/25/2022 17:15:00 UTC
Last modified on: 10/26/2022 18:52:00 UTC