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CVE-2025-48563: Local Escalation of Privilege due to Insecure Default Value in RemoteFillService.java

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Overview

The Common Vulnerabilities and Exposures (CVE) system has identified a significant security vulnerability, designated as CVE-2025-48563. This vulnerability affects the RemoteFillService.java application and could prove devastating if not properly addressed. It allows for the potential launch of background activities due to an insecure default value, leading to a local escalation of privilege. This can compromise the system or lead to data leakage, posing a significant risk to both individuals and organizations.

Vulnerability Summary

CVE ID: CVE-2025-48563
Severity: High, CVSS 7.8
Attack Vector: Local
Privileges Required: None
User Interaction: Not Required
Impact: Potential system compromise and data leakage

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Product | Affected Versions

RemoteFillService.java | All versions prior to patch

How the Exploit Works

The vulnerability lies in the ‘onNullBinding’ of RemoteFillService.java, where an insecure default value can potentially launch a background activity. This flaw could allow an attacker to exploit the system, escalate their privileges locally, and potentially gain unauthorized access to sensitive information. This exploitation does not require any additional execution privileges or user interaction.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. This pseudocode represents a malicious payload that could potentially trigger the vulnerability:

public void onNullBinding(RemoteFillService.java service) {
service.setDefault(null); // triggers the insecure default value
startBackgroundActivity(service); // exploits the vulnerability to launch a background activity
}

Mitigation

To mitigate this vulnerability, users are advised to apply the vendor patch as soon as it becomes available. In the interim, the use of a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary mitigation. Regular monitoring and updating of systems can also help prevent exploitation of this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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