CVE-2021-35989
📋 TL;DR
CVE-2021-35989 is an out-of-bounds write vulnerability in Adobe Bridge that allows arbitrary code execution when a user opens a malicious file. Attackers can exploit this to run code with the victim's privileges, affecting all users of Adobe Bridge version 11.0.2 and earlier.
💻 Affected Systems
- Adobe Bridge
📦 What is this software?
Bridge by Adobe
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's computer, data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Malware installation leading to data exfiltration, credential theft, or system disruption for individual users who open malicious files.
If Mitigated
Limited impact with proper patching and user awareness preventing malicious file execution.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 11.0.3 or later
Vendor Advisory: https://helpx.adobe.com/security/products/bridge/apsb21-53.html
Restart Required: Yes
Instructions:
1. Open Adobe Bridge. 2. Go to Help > Check for Updates. 3. Follow prompts to install version 11.0.3 or later. 4. Restart Adobe Bridge after installation.
🔧 Temporary Workarounds
Disable automatic file opening
allConfigure Adobe Bridge to not automatically open files, reducing attack surface.
Restrict file types
allUse application whitelisting to block execution of suspicious file types in Adobe Bridge.
🧯 If You Can't Patch
- Implement strict user training about opening files from untrusted sources
- Deploy application control solutions to block Adobe Bridge execution entirely
🔍 How to Verify
Check if Vulnerable:
Check Adobe Bridge version in Help > About Adobe Bridge. If version is 11.0.2 or earlier, system is vulnerable.Check Version:
On Windows: wmic product where name="Adobe Bridge" get version
On macOS: /Applications/Adobe Bridge/Adobe Bridge.app/Contents/Info.plist | grep -A1 CFBundleShortVersionStringVerify Fix Applied:
Verify Adobe Bridge version is 11.0.3 or later in Help > About Adobe Bridge.📡 Detection & Monitoring
Log Indicators:
- Adobe Bridge crash logs with memory access violations
- Unexpected process execution following Adobe Bridge launch
Network Indicators:
- Outbound connections from Adobe Bridge to suspicious domains
- Unusual network traffic patterns after file opening
SIEM Query:
source="*adobe*bridge*" AND (event_type="crash" OR process_execution="*suspicious*")