CVE-2026-25203: Samsung MagicINFO 9 Privilege Escalation

CVE-2026-25203 Overview

Samsung MagicINFO 9 Server is affected by an Incorrect Default Permissions vulnerability that enables local privilege escalation. This vulnerability stems from CWE-276 (Incorrect Default Permissions), where insecure file or directory permissions allow low-privileged local users to escalate their privileges on systems running vulnerable versions of the MagicINFO 9 Server software.

Critical Impact

Local attackers with low privileges can exploit incorrect default permissions to gain elevated access, potentially achieving full system compromise with high impact to confidentiality, integrity, and availability.

Affected Products

• Samsung MagicINFO 9 Server versions less than 21.1091.1

Discovery Timeline

• 2026-04-10 - CVE-2026-25203 published to NVD
• 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2026-25203

Vulnerability Analysis

This vulnerability represents a classic Incorrect Default Permissions flaw (CWE-276) in the Samsung MagicINFO 9 Server. The vulnerability requires local access to the affected system and low-level user privileges to exploit. Once exploited, an attacker can achieve high impact across all three security pillars—confidentiality, integrity, and availability—without requiring any user interaction.

The MagicINFO 9 Server is Samsung's digital signage content management solution used by enterprises to manage display content across multiple screens and locations. The improper permission configuration in versions prior to 21.1091.1 creates an exploitable path for privilege escalation.

Root Cause

The root cause of CVE-2026-25203 is incorrect default permissions (CWE-276) applied during the installation or operation of Samsung MagicINFO 9 Server. This typically occurs when:

• Installation directories or configuration files are created with overly permissive access rights
• Service accounts or executable files lack proper access restrictions
• Critical system resources are accessible to unprivileged users

These insecure defaults allow local users to modify, replace, or abuse files or services that run with elevated privileges.

Attack Vector

The attack vector is local, meaning an attacker must have existing access to the target system. The exploitation path typically involves:

1. An attacker with low-level access identifies files, directories, or services with incorrect permissions
2. The attacker modifies or replaces executable files, scripts, or configuration data
3. When the MagicINFO 9 Server service or a privileged process accesses these resources, the attacker's code executes with elevated privileges
4. The attacker gains full control over the affected system

The vulnerability can be exploited by modifying world-writable files or directories used by privileged processes. Attackers may replace service executables, inject malicious library files, or modify configuration settings that are loaded by services running under SYSTEM or administrator-level accounts. The low attack complexity combined with no user interaction requirements makes this vulnerability particularly dangerous once an attacker has local access.

Detection Methods for CVE-2026-25203

Indicators of Compromise

• Unexpected modifications to MagicINFO 9 Server installation directories or executables
• New or modified files in application directories with recent timestamps that don't correspond to scheduled updates
• Unusual process spawning from MagicINFO 9 Server service processes
• Changes to Windows service configurations related to MagicINFO components

Detection Strategies

• Monitor file integrity of the MagicINFO 9 Server installation directory using file integrity monitoring (FIM) solutions
• Audit permission changes on critical MagicINFO 9 Server files and directories
• Implement endpoint detection rules that alert on unauthorized privilege escalation attempts
• Review Windows Security Event Logs for permission modifications (Event ID 4670) and privilege escalation indicators

Monitoring Recommendations

• Enable detailed auditing on the MagicINFO 9 Server installation path and configuration directories
• Configure alerts for process creation events where MagicINFO services spawn unexpected child processes
• Monitor for lateral movement attempts following potential exploitation of this vulnerability
• Implement baseline monitoring for normal MagicINFO 9 Server behavior to detect anomalies

How to Mitigate CVE-2026-25203

Immediate Actions Required

• Upgrade Samsung MagicINFO 9 Server to version 21.1091.1 or later immediately
• Review and restrict file system permissions on the MagicINFO 9 Server installation directory
• Audit current system permissions to identify any files or directories with overly permissive access rights
• Limit local access to systems running MagicINFO 9 Server to only authorized administrators

Patch Information

Samsung has released a security update addressing this vulnerability. Administrators should upgrade to MagicINFO 9 Server version 21.1091.1 or later. For detailed patch information, consult the Samsung TV Security Updates page.

Workarounds

• Manually review and correct permissions on the MagicINFO 9 Server installation directory and subdirectories
• Remove write access for non-administrative users on all application executables and configuration files
• Implement application whitelisting to prevent unauthorized executable modifications
• Consider running the MagicINFO 9 Server in an isolated environment with restricted local access until patching is complete

# Example permission audit on Windows (run as Administrator)
# Check permissions on MagicINFO installation directory
icacls "C:\Program Files\Samsung\MagicINFO 9 Server" /T

# Remove inherited permissions and set restrictive ACLs
icacls "C:\Program Files\Samsung\MagicINFO 9 Server" /inheritance:r
icacls "C:\Program Files\Samsung\MagicINFO 9 Server" /grant:r Administrators:F
icacls "C:\Program Files\Samsung\MagicINFO 9 Server" /grant:r SYSTEM:F