CVE-2020-27583
📋 TL;DR
CVE-2020-27583 is a critical Java deserialization vulnerability in IBM InfoSphere Information Server 8.5.0.0 that allows unauthenticated remote attackers to execute arbitrary code on affected systems. This affects organizations running this specific version of IBM's data integration platform. Note that this vulnerability only impacts products no longer supported by IBM.
💻 Affected Systems
- IBM InfoSphere Information Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the server, enabling data theft, ransomware deployment, or use as a foothold for lateral movement.
Likely Case
Remote code execution leading to data exfiltration, installation of backdoors, or cryptomining malware.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to vulnerable services.
🎯 Exploit Status
Java deserialization vulnerabilities are well-understood with public exploit code available. Attackers can use tools like ysoserial to generate payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available since product is end-of-life. Upgrade to supported version or implement workarounds.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to InfoSphere Information Server to only trusted internal networks
Java Security Manager Configuration
allConfigure Java Security Manager to restrict deserialization operations
-Djava.security.manager -Djava.security.policy==/path/to/security.policy
🧯 If You Can't Patch
- Isolate affected systems in a dedicated network segment with strict firewall rules
- Implement application-level firewalls or WAF with deserialization attack detection
🔍 How to Verify
Check if Vulnerable:
Check IBM InfoSphere Information Server version via administrative console or installation directory. Version 8.5.0.0 is vulnerable.Check Version:
Check installation directory or administrative console for version informationVerify Fix Applied:
Verify workarounds are implemented by checking network access controls and Java Security Manager configuration.📡 Detection & Monitoring
Log Indicators:
- Unusual Java deserialization errors in application logs
- Suspicious network connections from InfoSphere server
Network Indicators:
- Inbound connections to InfoSphere ports (typically 9080, 9443) followed by unusual outbound connections
SIEM Query:
source="infosphere" AND (event="deserialization" OR event="ClassNotFoundException")