CVE-2023-40132 - Bypassing Content Providers Read Permissions in setActualDefaultRingtoneUri of RingtoneManager.java

In setActualDefaultRingtoneUri of RingtoneManager.java, a potential security vulnerability has been identified as a missing permission check. The vulnerability allows an attacker to bypass content providers read permissions, leading to local escalation of privilege. This could enable malicious apps to access user's sensitive information stored in the content providers. However, user interaction is required for the exploitation of this security flaw.

The CVE-2023-40132 vulnerability potentially affects various Android devices and should be addressed as soon as possible by developers to ensure the security of their applications.

Code Snippet

The following code snippet from RingtoneManager.java demonstrates the problematic setActualDefaultRingtoneUri method:

public static void setActualDefaultRingtoneUri(Context context, int type, Uri ringtoneUri) {
    if (ringtoneUri != null && ContentResolver.SCHEME_FILE.equals(ringtoneUri.getScheme())) {
      throw new IllegalArgumentException("Local files are not supported.");
    }
    // Missing permission check
    ...
}

For a better understanding of the CVE-2023-40132 vulnerability, refer to the original references

1. Android Open Source Project - RingtoneManager.java Source Code
2. CVE Details - CVE-2023-40132

Exploit Details

In order to exploit the CVE-2023-40132 vulnerability, an attacker would create a malicious app that would mimic the behavior of an allowed content provider. The app could make use of the setActualDefaultRingtoneUri function to access sensitive user information from the content providers without proper read permissions.

The exploitation would require the user to interact with the malicious app, for example by installing and launching it. The attacker would be able to escalate their privileges locally and compromise the integrity, confidentiality, and availability of the user's data.

Mitigation

To prevent exploitation of the CVE-2023-40132 vulnerability, developers should ensure that proper permission checks are implemented in the setActualDefaultRingtoneUri method of RingtoneManager.java. Additionally, developers should apply the principle of least privilege, limiting app permissions to only what is strictly necessary.

Users should be cautious when downloading and installing apps from third-party sources and remain vigilant about granting permissions to applications.

Conclusion

The CVE-2023-40132 vulnerability in setActualDefaultRingtoneUri of RingtoneManager.java highlights the importance of thorough security code review and adhering to best coding practices. Developers must take into consideration potential loopholes that can be exploited by malicious actors, such as missing permission checks, that could lead to local escalation of privileges. By addressing these vulnerabilities and keeping users informed, developers can contribute to making the app ecosystem more secure and reliable.

Timeline

Published on: 01/21/2025 23:15:11 UTC
Last modified on: 03/24/2025 17:15:15 UTC