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A critical vulnerability (CVE-2025-30401) has been discovered in WhatsApp, where a malicious file disguised as an image (e.g., malicious.jpg.exe) can execute arbitrary code when opened. Attackers exploit this by hiding executable files within seemingly harmless image extensions, leading to potential device takeover.
How to Check Your WhatsApp Version
To verify if you’re affected, follow these steps:
- Android: Open WhatsApp → Tap Settings (⋮) → Help → App Info.
- iOS: Go to App Store → Search WhatsApp → Check updates.
- Windows/Mac: Open WhatsApp → Click Help → About.
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You Should Know: Detection & Mitigation Techniques
1. Verify File Extensions (Windows/Linux)
Malicious files often hide extensions. Enable visibility:
- Windows:
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /v HideFileExt /t REG_DWORD /d 0 /f
Restart Explorer:
taskkill /f /im explorer.exe && start explorer.exe
– Linux:
ls -la | grep -E '.exe|.bat|.sh'
2. Disable Automatic File Execution
- Windows:
Set-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Associations" -Name "LowRiskFileTypes" -Value ".exe;.bat;.cmd"
- Linux: Restrict permissions:
chmod -x suspicious_file.jpg
3. Sandbox Suspicious Files
Use tools like:
- Windows Sandbox:
Enable-WindowsOptionalFeature -Online -FeatureName "Containers-DisposableClientVM"
- Linux (Firejail):
sudo apt install firejail firejail --private ./suspicious_file.jpg
4. Monitor Processes
- Windows:
tasklist /svc | findstr "WhatsApp"
- Linux:
ps aux | grep -i whatsapp
What Undercode Say
This exploit underscores the importance of:
1. File Extension Awareness: Always check file properties.
- Least Privilege Principle: Run apps with minimal permissions.
3. Regular Updates: Patch WhatsApp immediately.
- Behavioral Analysis: Use tools like Wireshark (
tshark -i eth0 -Y "http or ssl") to detect unusual traffic.
Expected Output:
- A secure system with visible file extensions.
- Blocked unauthorized executables via Group Policy (
gpedit.msc). - Sandboxed or isolated suspicious files.
Relevant URL: WhatsApp Security Advisory
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References:
Reported By: Dipanshu Kumar – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
