A newly discovered vulnerability, registered as CVE-2024-23712, affects multiple functions of AppOpsService.java and has a dangerous potential to saturate the content of /data/system/appops_accesses.xml file due to resource exhaustion. This vulnerability can lead to a local denial of service (DoS) attack without the need for additional execution privileges or even user interaction. In this post, we will dive into the details of this vulnerability, explore the code snippet, provide official references, and delve into exploit specifics.

Affected File: AppOpsService.java

Affected Functions: Multiple functions within the file

Impact: Local Denial of Service (DoS) without additional execution privileges

Description

The vulnerability lies in multiple functions of the AppOpsService.java file, which is responsible for handling various operations associated with Android application permissions. These functions contain a flaw that allows an attacker to saturate the content of the /data/system/appops_accesses.xml file due to resource exhaustion. As a result, this can lead to denial of service, causing crashes and slowdowns in the affected system.

The following code snippet from the AppOpsService.java file showcases the primary issue

´´´java
// AppOpsService.java
...
private void writeState() {

FileOutputStream fileOutputStream = this.mContext.openFileOutput("appops_accesses.xml", );

´´´
When the writeState() function is called, it opens the appops_accesses.xml file with an overwritten mode. With a specifically crafted input, an attacker can send an excessive amount of data to appops_accesses.xml, which will result in resource exhaustion, leading to a local denial of service (DoS) without additional execution privileges.

References

To better understand the vulnerability and its implications in the context of the Android operating system, refer to the following official links:

1. Android Open Source Project (AOSP) AppOpsService.java source code: https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/services/core/java/com/android/server/appop/AppOpsService.java
2. CVE-2024-23712 Official CVE Entry: https://cve.org/CVE-2024-23712

Exploit

Though the exploit details for this vulnerability are not publicly available yet, it is important for users and Android developers to be aware of its potential impact. As this vulnerability can lead to a local denial of service (DoS) and affect the application's performance and stability, it is crucial to apply patches and fixes as soon as they become available.

Conclusion

In conclusion, the CVE-2024-23712 vulnerability can lead to a local denial of service (DoS) in multiple functions of an app due to resource exhaustion. By saturating the content of the /data/system/appops_accesses.xml file, an attacker can cause crashes and slowdowns, affecting the overall performance of the system. Stay vigilant and keep your applications up to date to prevent potential exploitation. Keep an eye on official sources for fixes and patches to protect your device from this vulnerability.

Timeline

Published on: 05/07/2024 21:15:08 UTC
Last modified on: 08/01/2024 23:13:07 UTC