CVE-2025-58484: Samsung Cloud Assistant Data Disclosure

CVE-2025-58484 Overview

CVE-2025-58484 is a medium-severity vulnerability in Samsung Cloud Assistant caused by incorrect default permissions. The flaw exists in versions of Samsung Cloud Assistant prior to 8.0.03.8. A local attacker can leverage the misconfigured permissions to access partial data inside the application sandbox. Exploitation requires local access to the affected device and does not require user interaction or privileges. Samsung addressed the issue in its December 2025 mobile security maintenance release.

Critical Impact

A local attacker can read partial sandboxed data from Samsung Cloud Assistant, leading to limited information disclosure on affected Samsung mobile devices.

Affected Products

• Samsung Cloud Assistant versions prior to 8.0.03.8
• Samsung mobile devices with Samsung Cloud Assistant installed
• Devices not updated with the December 2025 Samsung Mobile Security Update

Discovery Timeline

• 2025-12-02 - CVE-2025-58484 published to the National Vulnerability Database (NVD)
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-58484

Vulnerability Analysis

The vulnerability is classified as an Insecure Permissions issue affecting the Samsung Cloud Assistant application. Samsung Cloud Assistant ships with default permissions that allow a local actor to read partial data within the application's sandbox. The sandbox is intended to isolate application data from other processes on the device. Incorrect default permissions weaken this isolation boundary.

The attack vector is local, meaning the actor needs prior code execution or app installation on the device. No user interaction is required to trigger the flaw. Confidentiality impact is limited to partial data exposure. Integrity and availability are not affected based on the published vector. The scope is unchanged, so the disclosure remains within the affected application's security context.

Root Cause

The root cause is incorrect default permissions assigned to resources owned by Samsung Cloud Assistant prior to version 8.0.03.8. Android applications rely on per-app UID isolation and file mode bits to restrict access to private storage. When files or IPC endpoints are created with overly permissive modes, other local processes can read content that should remain private. Samsung corrected the default permissions in version 8.0.03.8.

Attack Vector

A local attacker with the ability to run code on the device, including through a co-installed malicious application, can interact with Samsung Cloud Assistant resources directly. Because the affected permissions are set by the vulnerable version itself, exploitation does not require root or elevated privileges. The attacker reads accessible files or endpoints exposed by the misconfigured sandbox and extracts the partial data contained within.

No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Samsung Mobile Security Update for vendor technical context.

Detection Methods for CVE-2025-58484

Indicators of Compromise

• Presence of Samsung Cloud Assistant at a version earlier than 8.0.03.8 on managed devices
• Local processes or sideloaded applications enumerating Samsung Cloud Assistant data directories
• Unexpected read access to Samsung Cloud Assistant sandbox files by non-system UIDs

Detection Strategies

• Inventory mobile device fleets and flag installations of Samsung Cloud Assistant below version 8.0.03.8
• Use mobile device management (MDM) compliance policies to detect devices missing the December 2025 Samsung security patch level
• Review installed application logs for suspicious sideloaded packages that request broad storage or accessibility permissions

Monitoring Recommendations

• Enforce MDM reporting of Samsung patch level and surface devices below the December 2025 maintenance release
• Monitor enterprise app stores and EMM consoles for outdated Samsung Cloud Assistant deployments
• Alert on installation of unvetted third-party applications on devices that still run vulnerable Samsung Cloud Assistant builds

How to Mitigate CVE-2025-58484

Immediate Actions Required

• Update Samsung Cloud Assistant to version 8.0.03.8 or later through the Galaxy Store
• Apply the December 2025 Samsung Mobile Security maintenance release to affected devices
• Restrict installation of untrusted applications on managed Samsung devices through MDM policy

Patch Information

Samsung published a fix in Samsung Cloud Assistant version 8.0.03.8, distributed as part of the December 2025 Samsung Mobile Security Update. Details and version metadata are available in the Samsung Mobile Security Update advisory. Enterprises managing Samsung fleets should validate that the affected application is updated and the device security patch level reflects the December 2025 release.

Workarounds

• Disable or uninstall Samsung Cloud Assistant on devices that cannot be updated immediately
• Block sideloading and limit third-party application sources via MDM until devices are patched
• Restrict use of vulnerable devices for handling sensitive data until the update is applied

# Verify Samsung Cloud Assistant version on a managed device via ADB
adb shell dumpsys package com.samsung.android.app.cloudassistant | grep versionName