CVE-2025-20931
📋 TL;DR
This vulnerability allows local attackers to execute arbitrary code by exploiting an out-of-bounds write when parsing BMP images in Samsung Notes. Attackers can achieve remote code execution by tricking users into opening malicious BMP files. Only Samsung Notes users on affected versions are impacted.
💻 Affected Systems
- Samsung Notes
📦 What is this software?
Notes by Samsung
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the device, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation allowing attackers to execute code with the user's permissions, potentially accessing sensitive notes and system resources.
If Mitigated
Application crash or denial of service if exploit fails, with potential data loss in open notes.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious BMP). No public exploit code available as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.4.26.71 or later
Vendor Advisory: https://security.samsungmobile.com/serviceWeb.smsb?year=2025&month=03
Restart Required: No
Instructions:
1. Open Samsung Galaxy Store or Google Play Store. 2. Search for 'Samsung Notes'. 3. If update available, tap 'Update'. 4. Alternatively, enable auto-updates in store settings.
🔧 Temporary Workarounds
Disable automatic image loading
allConfigure Samsung Notes to not automatically load images from untrusted sources
Restrict BMP file handling
allUse mobile device management or security software to block BMP files from being opened in Samsung Notes
🧯 If You Can't Patch
- Uninstall Samsung Notes if not required
- Use alternative note-taking applications that are not vulnerable
🔍 How to Verify
Check if Vulnerable:
Check Samsung Notes version in app settings or device application manager. Versions below 4.4.26.71 are vulnerable.Check Version:
On Android: Settings > Apps > Samsung Notes > App info. On Windows: Open Samsung Notes > Settings > About.Verify Fix Applied:
Confirm Samsung Notes version is 4.4.26.71 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Application crashes when opening BMP files
- Unusual process spawning from Samsung Notes
- Memory access violations in system logs
Network Indicators:
- Unusual outbound connections from Samsung Notes process
- Downloads of BMP files from untrusted sources
SIEM Query:
process_name:"Samsung Notes" AND (event_type:crash OR memory_violation:true)