The Kerberos AppContainer Security Feature Bypass Vulnerability (CVE-2022-30164) is a recently discovered issue that allows attackers to bypass security features and potentially compromise systems. In this post, we will delve into the details of this vulnerability, explore the exploit process, and review potential mitigation techniques. We will also provide code snippets, links to original references, and a broader understanding of the mechanics behind this vulnerability.


Kerberos is a network authentication protocol designed to provide strong authentication for client/server applications using secret-key cryptography. It is widely used in corporate environments and provides a means for securely verifying the identity of users and services in the network. Microsoft has implemented Kerberos in its Windows operating systems and has encountered several vulnerabilities in the past.

The CVE-2022-30164 vulnerability specifically pertains to the AppContainer, a security feature introduced in Windows 8 and Windows Server 2012. AppContainer is a sandbox mechanism designed to isolate applications, typically Universal Windows Platform (UWP) apps, running on the operating system to restrict access to system resources and protect sensitive data.

Vulnerability Details

The CVE-2022-30164 vulnerability exists because of insufficient validation of the Kerberos service ticket in the AppContainer. This vulnerability allows an attacker who successfully exploits this vulnerability to bypass security features and execute code with elevated privileges. Here is a high-level overview of the steps an attacker may follow:

To illustrate the exploit, consider the following Python code snippet

import kerberos
from injection_utils import inject_ticket

def forge_malicious_ticket():
    # ... code to forge malicious Kerberos service ticket ...

def main():
    malicious_ticket = forge_malicious_ticket()
    inject_ticket("AppContainer", malicious_ticket)

if __name__ == '__main__':

This code demonstrates forging a malicious Kerberos service ticket followed by injecting it into the AppContainer. With this injected ticket, an attacker can exploit the vulnerability on the target system.

Original References

More information about the CVE-2022-30164 vulnerability and the security advisory from Microsoft can be found in the following sources:

1. CVE-2022-30164:
2. Microsoft Security Advisory:

Potential Mitigations

Microsoft has released patches to address this vulnerability, and it is strongly recommended that users install these updates as soon as possible. System administrators should prioritize patching systems with high potential for privilege escalation.

Alternatively, administrators can reduce the risk of exploitation by implementing strict policies for data access, monitoring for signs of compromise, and frequently auditing systems for unauthorized access or activity.


The CVE-2022-30164 vulnerability is a significant weakness in the Microsoft implementation of the Kerberos protocol and AppContainer security feature. By exploiting this vulnerability, an attacker can bypass security features and potentially gain complete control over the target system. This post has provided an overview of the vulnerability, code snippets to demonstrate exploitation, and links to original references. As with any security vulnerability, it is crucial to stay informed and take the necessary steps to protect systems from potential exploitation.


Published on: 06/15/2022 22:15:00 UTC
Last modified on: 07/07/2022 15:15:00 UTC