CVE-2021-42724
📋 TL;DR
Adobe Bridge versions 11.1.1 and earlier contain a memory corruption vulnerability that allows attackers to execute arbitrary code by tricking users into opening malicious files. This affects all users running vulnerable versions of Adobe Bridge. Successful exploitation requires user interaction but could lead to complete system compromise.
💻 Affected Systems
- Adobe Bridge
📦 What is this software?
Bridge by Adobe
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the current user, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation leading to data exfiltration, credential theft, or lateral movement within the network.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially only affecting isolated user data.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) and knowledge of memory corruption techniques. No public exploit code available as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 11.1.2 or later
Vendor Advisory: https://helpx.adobe.com/security/products/bridge/apsb21-94.html
Restart Required: Yes
Instructions:
1. Open Adobe Bridge. 2. Go to Help > Check for Updates. 3. Follow prompts to install version 11.1.2 or later. 4. Restart Adobe Bridge after installation.
🔧 Temporary Workarounds
Disable automatic file opening
allConfigure Adobe Bridge to not automatically open files or use safe mode for file handling
Restrict file types
windowsUse group policy or application controls to block suspicious file types from being opened in Adobe Bridge
🧯 If You Can't Patch
- Remove Adobe Bridge from systems where it's not essential for business operations
- Implement application whitelisting to prevent execution of malicious payloads even if vulnerability is triggered
🔍 How to Verify
Check if Vulnerable:
Check Adobe Bridge version in Help > About Adobe Bridge. If version is 11.1.1 or earlier, system is vulnerable.Check Version:
On Windows: Check registry at HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Bridge\VersionVerify Fix Applied:
Verify Adobe Bridge version is 11.1.2 or later in Help > About Adobe Bridge.📡 Detection & Monitoring
Log Indicators:
- Adobe Bridge crash logs with memory access violations
- Unexpected child processes spawned from Adobe Bridge
Network Indicators:
- Outbound connections from Adobe Bridge to suspicious IPs
- DNS requests for known malicious domains from Adobe Bridge process
SIEM Query:
process_name:"bridge.exe" AND (event_type:crash OR parent_process:unusual)