CVE-2021-28580
📋 TL;DR
CVE-2021-28580 is a buffer overflow vulnerability in Adobe Medium versions 2.4.5.331 and earlier that allows remote code execution when a user opens a malicious file. An unauthenticated attacker can exploit this to run arbitrary code with the victim's privileges. All users running vulnerable versions of Adobe Medium are affected.
💻 Affected Systems
- Adobe Medium
📦 What is this software?
Medium by Adobe
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's computer and potentially moving laterally through the network.
Likely Case
Attacker executes malicious code to steal data, install ransomware, or establish persistence on the victim's system.
If Mitigated
No impact if users don't open untrusted files or if the application is patched.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) but no authentication. Buffer overflow exploitation requires some technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.4.6 or later
Vendor Advisory: https://helpx.adobe.com/security/products/medium/apsb21-34.html
Restart Required: Yes
Instructions:
1. Open Adobe Medium. 2. Go to Help > Check for Updates. 3. Follow prompts to install version 2.4.6 or later. 4. Restart the application.
🔧 Temporary Workarounds
Disable file opening from untrusted sources
allConfigure system or application to block opening of untrusted files in Adobe Medium
Application control via Windows Defender
windowsUse Windows Defender Application Control to restrict Adobe Medium from opening files
New-AppLockerPolicy -RuleType Path -Action Deny -Path "C:\Program Files\Adobe\Medium\Medium.exe" -User Everyone
🧯 If You Can't Patch
- Uninstall Adobe Medium if not essential for business operations
- Implement strict email filtering to block potentially malicious attachments
🔍 How to Verify
Check if Vulnerable:
Check Adobe Medium version in application settings or About dialog. If version is 2.4.5.331 or earlier, system is vulnerable.Check Version:
On Windows: wmic product where name="Adobe Medium" get version
On macOS: /Applications/Adobe\ Medium.app/Contents/Info.plist | grep -A1 CFBundleShortVersionStringVerify Fix Applied:
Verify Adobe Medium version is 2.4.6 or later in application settings.📡 Detection & Monitoring
Log Indicators:
- Application crashes in Adobe Medium logs
- Unexpected process creation from Medium.exe
- File access to suspicious file types
Network Indicators:
- Outbound connections from Medium.exe to unknown IPs
- DNS requests for suspicious domains after file opening
SIEM Query:
source="*medium*" AND (event_type="crash" OR process_name="Medium.exe" AND parent_process!="explorer.exe")