CVE-2021-40212
📋 TL;DR
An out-of-bounds write vulnerability in PotPlayer version 1.7.21523 build 210729 allows attackers to write beyond allocated memory boundaries. This can lead to remote code execution, information disclosure, or denial of service. Users running the vulnerable version of PotPlayer are affected.
💻 Affected Systems
- PotPlayer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with SYSTEM/administrator privileges leading to complete system compromise
Likely Case
Application crash (denial of service) or limited information disclosure
If Mitigated
Application crash with no privilege escalation if memory protections are enabled
🎯 Exploit Status
Exploitation requires user to open a specially crafted media file
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.7.21523 build 210729
Vendor Advisory: https://potplayer.daum.net/
Restart Required: Yes
Instructions:
1. Open PotPlayer 2. Go to Help > Check for Updates 3. Download and install latest version 4. Restart PotPlayer
🔧 Temporary Workarounds
Disable automatic media file opening
windowsPrevent PotPlayer from automatically opening media files
PotPlayer Settings > General > Uncheck 'Associate with media files'
Use application whitelisting
windowsRestrict execution of PotPlayer to trusted locations only
🧯 If You Can't Patch
- Uninstall PotPlayer and use alternative media players
- Implement strict file type restrictions to block suspicious media files
🔍 How to Verify
Check if Vulnerable:
Open PotPlayer > Help > About PotPlayer > Check if version is 1.7.21523 build 210729Check Version:
wmic product where name="PotPlayer" get versionVerify Fix Applied:
Verify version is newer than 1.7.21523 build 210729 in About dialog📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violation errors
- Unexpected PotPlayer process termination
Network Indicators:
- Downloads of suspicious media files followed by PotPlayer execution
SIEM Query:
EventID=1000 Source="Application Error" FaultingModuleName="PotPlayerMini64.exe" OR ProcessName="PotPlayerMini64.exe" AND TerminationReason="0xc0000005"🔗 References
- https://a-man-in-the-cookie.blogspot.com
- https://a-man-in-the-cookie.blogspot.com/2021/08/PotPlayer-Critical-Memory-Access-Violation-Vulnerability.html
- https://a-man-in-the-cookie.blogspot.com
- https://a-man-in-the-cookie.blogspot.com/2021/08/PotPlayer-Critical-Memory-Access-Violation-Vulnerability.html
