CVE-2020-7828
📋 TL;DR
CVE-2020-7828 is a heap-based buffer overflow vulnerability in DaviewIndy image viewer software. When users open specially crafted malicious files, attackers can execute arbitrary code on the system. This affects all users running DaviewIndy version 8.98.4 or earlier.
💻 Affected Systems
- DaviewIndy
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the victim's computer, enabling data theft, ransomware deployment, or lateral movement within networks.
Likely Case
Remote code execution leading to malware installation, credential theft, or system disruption for individual users who open malicious files.
If Mitigated
Limited impact with proper application whitelisting and user education preventing execution of malicious files.
🎯 Exploit Status
Exploitation requires user interaction to open malicious files. Proof-of-concept code exists in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.98.5 or later
Vendor Advisory: https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=35539
Restart Required: Yes
Instructions:
1. Download latest version from official DaviewIndy website. 2. Uninstall current version. 3. Install updated version. 4. Restart system.
🔧 Temporary Workarounds
Application Control
windowsBlock execution of Daview.exe using application whitelisting or endpoint protection
Using AppLocker: New-AppLockerPolicy -RuleType Path -Action Deny -Path "C:\Program Files\DaviewIndy\Daview.exe" -User Everyone
File Association Removal
windowsRemove file associations to prevent automatic opening with DaviewIndy
assoc .bmp=
assoc .jpg=
assoc .png=
assoc .gif=
assoc .tiff=
🧯 If You Can't Patch
- Implement strict application control policies to block Daview.exe execution
- Educate users to avoid opening untrusted image files and use alternative image viewers
🔍 How to Verify
Check if Vulnerable:
Check DaviewIndy version in Help > About menu. If version is 8.98.4 or earlier, system is vulnerable.Check Version:
Not applicable - check through GUI Help > About menuVerify Fix Applied:
Verify version is 8.98.5 or later in Help > About menu. Test with known safe image files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Daview.exe process crashes with access violation errors
- Unexpected child processes spawned from Daview.exe
- Multiple failed file open attempts in short timeframe
Network Indicators:
- Outbound connections from Daview.exe process to unknown IPs
- DNS queries for suspicious domains from system running DaviewIndy
SIEM Query:
Process Creation where Image ends with 'Daview.exe' AND (CommandLine contains '.bmp' OR CommandLine contains '.jpg' OR CommandLine contains '.png')