CVE-2020-4280 – CVE-2020-4280 is a remote code execution vulner... (How to Fix)

Q: What is the severity of CVE-2020-4280?

CVE-2020-4280 has a CVSS score of 8.8 (HIGH). CVE-2020-4280 is a remote code execution vulnerability in IBM QRadar SIEM caused by insecure Java deserialization. Attackers can send malicious serialized Java objects to execute arbitrary commands on affected systems. This affects IBM QRadar SIEM versions 7.3 and 7.4.

📋 TL;DR

CVE-2020-4280 is a remote code execution vulnerability in IBM QRadar SIEM caused by insecure Java deserialization. Attackers can send malicious serialized Java objects to execute arbitrary commands on affected systems. This affects IBM QRadar SIEM versions 7.3 and 7.4.

💻 Affected Systems

Products:

IBM QRadar SIEM

Versions: 7.3.0 through 7.3.3 and 7.4.0 through 7.4.3

Operating Systems: Linux

Default Config Vulnerable: ⚠️ Yes

Notes: All default installations within affected version ranges are vulnerable.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise with attacker gaining full control over the QRadar server, allowing data exfiltration, lateral movement, and persistent backdoor installation.

🟠

Likely Case

Remote code execution leading to data theft, system manipulation, and potential pivot to other network resources.

🟢

If Mitigated

Limited impact if proper network segmentation and access controls prevent exploitation attempts.

🌐 Internet-Facing: HIGH

🏢 Internal Only: HIGH

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: CONFIRMED

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Public exploit code and detailed technical analysis are available. The vulnerability requires no authentication to exploit.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 7.3.3 Patch 8 and 7.4.3 Patch 4

Vendor Advisory: https://www.ibm.com/support/pages/node/6344079

Restart Required: Yes

Instructions:

1. Download the appropriate patch from IBM Fix Central. 2. Apply patch using QRadar update mechanism. 3. Restart QRadar services. 4. Verify patch installation.

🔧 Temporary Workarounds

Network Access Restriction

all

Restrict network access to QRadar management interfaces to trusted IP addresses only.

Use firewall rules to limit access to QRadar ports (typically 443, 22)

🧯 If You Can't Patch

Implement strict network segmentation to isolate QRadar from untrusted networks
Deploy intrusion detection/prevention systems to monitor for exploitation attempts

🔍 How to Verify

Check if Vulnerable:

Check QRadar version via Admin interface or command line. Vulnerable if version is 7.3.0-7.3.3 or 7.4.0-7.4.3 without patches.

Check Version:

/opt/qradar/bin/qradar_versions.sh

Verify Fix Applied:

Verify patch installation in QRadar Admin interface under System & License Management > Updates.

📡 Detection & Monitoring

Log Indicators:

Unusual Java deserialization errors in QRadar logs
Suspicious process execution from QRadar services

Network Indicators:

Malformed serialized Java objects sent to QRadar endpoints
Unexpected outbound connections from QRadar server

SIEM Query:

source='qradar' AND (eventName='DeserializationError' OR processName CONTAINS 'java' AND cmdLine CONTAINS 'Runtime.exec')

📊 Metadata

CVE ID: CVE-2020-4280

CVSS v3 Score: 8.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-502

Published: October 8, 2020

Last Updated: November 21, 2024

🔗 References

http://packetstormsecurity.com/files/159589/QRadar-RemoteJavaScript-Deserialization.html Exploit,Third Party Advisory,VDB Entry
http://seclists.org/fulldisclosure/2020/Oct/18 Exploit,Mailing List,Third Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/176140 VDB Entry,Vendor Advisory
https://www.ibm.com/support/pages/node/6344079 Patch,Vendor Advisory
http://packetstormsecurity.com/files/159589/QRadar-RemoteJavaScript-Deserialization.html Exploit,Third Party Advisory,VDB Entry
http://seclists.org/fulldisclosure/2020/Oct/18 Exploit,Mailing List,Third Party Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/176140 VDB Entry,Vendor Advisory
https://www.ibm.com/support/pages/node/6344079 Patch,Vendor Advisory

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🔗 Related Vulnerabilities

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📋 TL;DR

💻 Affected Systems

📦 What is this software?

Qradar Security Information And Event Manager by Ibm

Qradar Security Information And Event Manager by Ibm

Qradar Security Information And Event Manager by Ibm

Qradar Security Information And Event Manager by Ibm

Qradar Security Information And Event Manager by Ibm

Qradar Security Information And Event Manager by Ibm

⚠️ Risk & Real-World Impact

Worst Case

Likely Case

If Mitigated

🎯 Exploit Status

🛠️ Fix & Mitigation

✅ Official Fix

Instructions:

🔧 Temporary Workarounds

Network Access Restriction

🧯 If You Can't Patch

🔍 How to Verify

Check if Vulnerable:

Check Version:

Verify Fix Applied:

📡 Detection & Monitoring

Log Indicators:

Network Indicators:

SIEM Query:

📊 Metadata

🔗 References

📤 Share & Export

🔗 Related Vulnerabilities