CVE-2024-49413: Samsung Android Privilege Escalation Flaw

CVE-2024-49413 Overview

CVE-2024-49413 is an Improper Verification of Cryptographic Signature vulnerability (CWE-347) affecting Samsung's SmartSwitch application on Samsung Android devices. This security flaw allows local attackers to bypass signature verification mechanisms and install malicious applications on affected devices. The vulnerability exists in SmartSwitch versions prior to SMR Dec-2024 Release 1.

SmartSwitch is Samsung's official data transfer and backup application used by millions of Samsung device users worldwide. By exploiting this vulnerability, an attacker with local access can circumvent the cryptographic signature checks that normally ensure only legitimate, verified applications can be installed, potentially leading to device compromise.

Critical Impact

Local attackers can install malicious applications by bypassing cryptographic signature verification in SmartSwitch, potentially gaining full control over affected Samsung devices.

Affected Products

• Samsung Android 13.0 (all SMR releases prior to Dec-2024)
• Samsung Android 14.0 (all SMR releases prior to Dec-2024)
• SmartSwitch application prior to SMR Dec-2024 Release 1

Discovery Timeline

• December 3, 2024 - CVE-2024-49413 published to NVD
• February 10, 2025 - Last updated in NVD database

Technical Details for CVE-2024-49413

Vulnerability Analysis

This vulnerability stems from improper verification of cryptographic signatures within the SmartSwitch application. When applications are transferred or restored through SmartSwitch, the application should verify that packages are properly signed with valid cryptographic signatures to prevent tampering or the installation of unauthorized code. The flaw in the signature verification process allows attackers to bypass these security controls.

The exploitation requires local access to the device, meaning an attacker would need physical access or the ability to execute code locally on the target device. Once exploited, the attacker can install malicious applications that would normally be rejected by the signature verification process. This could lead to complete device compromise with full access to confidential data, the ability to modify system integrity, and potential denial of service.

Root Cause

The root cause is inadequate implementation of cryptographic signature verification in the SmartSwitch application. Specifically, the application fails to properly validate the authenticity and integrity of application packages during the transfer or restoration process. This may involve insufficient validation of certificate chains, improper handling of signature verification results, or flawed logic in the signature checking code path that allows unsigned or improperly signed applications to pass through as legitimate.

Attack Vector

The attack vector is local, requiring an attacker to have some level of access to the target device. Potential attack scenarios include:

1. Physical Access Attack: An attacker with temporary physical access to an unlocked device could exploit SmartSwitch to install malicious applications that persist after the device is returned.

2. Malicious Application Chain: An existing malicious application with limited permissions could leverage this vulnerability through SmartSwitch to install a more privileged malicious application.

3. Social Engineering: An attacker could convince a user to perform a SmartSwitch restore using a crafted backup that contains malicious applications with forged signatures.

The vulnerability does not require user interaction beyond the normal SmartSwitch workflow, and an attacker with low privileges can exploit it to achieve high impact across confidentiality, integrity, and availability.

Detection Methods for CVE-2024-49413

Indicators of Compromise

• Unexpected applications installed on Samsung devices that were not downloaded from official sources
• SmartSwitch activity logs showing unusual restore or transfer operations
• Applications with invalid or missing signatures present on the device
• Unusual system behavior following SmartSwitch backup restoration

Detection Strategies

• Monitor SmartSwitch operations for anomalous package installation activities
• Implement mobile device management (MDM) solutions to track application installations
• Audit installed applications against known-good baselines for Samsung devices
• Use SentinelOne Mobile Threat Defense to detect unauthorized application installations and signature verification bypass attempts

Monitoring Recommendations

• Enable detailed logging for SmartSwitch operations on managed devices
• Configure alerts for new application installations outside of approved channels
• Regularly audit device security patch levels to ensure SMR Dec-2024 Release 1 or later is installed
• Monitor for unusual file system modifications in application directories

How to Mitigate CVE-2024-49413

Immediate Actions Required

• Update Samsung devices to SMR Dec-2024 Release 1 or later immediately
• Verify SmartSwitch application is updated to the latest patched version
• Review recently installed applications on potentially affected devices
• Restrict physical access to sensitive Samsung devices until patches are applied
• Consider disabling SmartSwitch functionality on high-security devices until patching is complete

Patch Information

Samsung has addressed this vulnerability in the SMR Dec-2024 Release 1 security update. Organizations and users should apply this update as soon as possible. The patch is available through the standard Samsung device update mechanism (Settings > Software Update > Download and Install). For enterprise deployments, administrators can push the update through Samsung Knox or other MDM solutions.

For detailed patch information, refer to the Samsung Mobile Security Update for December 2024.

Workarounds

• Avoid using SmartSwitch for data transfer or backup operations until the patch is applied
• Use alternative Samsung-approved data transfer methods that do not rely on the vulnerable SmartSwitch functionality
• Implement strict physical access controls for affected devices
• Enable Samsung Knox Container or similar isolation features to limit the impact of potentially malicious applications
• Monitor devices closely for suspicious application installations

# Check current Samsung security patch level via ADB
adb shell getprop ro.build.version.security_patch

# Verify SmartSwitch package version
adb shell dumpsys package com.sec.android.easyMover | grep versionName

# List recently installed applications for audit
adb shell pm list packages -i --show-versioncode | grep -v "com.android" | grep -v "com.samsung"