CVE-2023-28500
📋 TL;DR
This CVE describes a critical Java insecure deserialization vulnerability in Adobe LiveCycle ES4 that allows unauthenticated remote attackers to execute arbitrary operating system code. The vulnerability affects Adobe LiveCycle ES4 version 11.0 and earlier, and potentially version 11.0.1+ when installed with Java 7u21 or earlier. Only products no longer supported by Adobe are affected.
💻 Affected Systems
- Adobe LiveCycle ES4
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with privileged access to the operating system, allowing attackers to install malware, exfiltrate data, or pivot to other systems.
Likely Case
Remote code execution leading to data theft, ransomware deployment, or system takeover.
If Mitigated
No impact if systems are properly isolated, patched, or running unaffected configurations.
🎯 Exploit Status
Exploitation requires sending specially crafted Java serialized objects to a specific URL. Public references exist.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available since Adobe no longer supports affected versions. Consider upgrading to supported products or implementing workarounds.
🔧 Temporary Workarounds
Upgrade Java Environment
allUpgrade Java environment to version 7u25 or later to mitigate the vulnerability.
Download and install Java 7u25+ from Oracle
Network Isolation
allRestrict network access to Adobe LiveCycle ES4 instances to trusted networks only.
Configure firewall rules to block external access to Adobe LiveCycle ports
🧯 If You Can't Patch
- Isolate affected systems in a segmented network with strict access controls.
- Implement application-level firewalls or WAF rules to block malicious serialized object payloads.
🔍 How to Verify
Check if Vulnerable:
Check Adobe LiveCycle ES4 version and Java version. If Adobe LiveCycle ES4 is version 11.0 or earlier, or version 11.0.1+ with Java 7u21 or earlier, the system is vulnerable.Check Version:
java -versionVerify Fix Applied:
Verify Java version is 7u25 or later and Adobe LiveCycle ES4 is not accessible from untrusted networks.📡 Detection & Monitoring
Log Indicators:
- Unusual Java deserialization errors in application logs
- Requests to specific URLs with serialized object payloads
Network Indicators:
- HTTP POST requests containing Java serialized objects to Adobe LiveCycle endpoints
SIEM Query:
source="adobe_livecycle" AND (url_path="/specific_vulnerable_endpoint" OR message="*deserialization*")