CVE-2021-39088

Q: What is the severity of CVE-2021-39088?

CVE-2021-39088 has a CVSS score of 7.8 (HIGH). CVE-2021-39088 is a local privilege escalation vulnerability in IBM QRadar SIEM that allows authenticated local users to elevate their privileges to root/admin level. This affects IBM QRadar SIEM versions 7.3, 7.4, and 7.5. The vulnerability requires local access and could be combined with other unknown vulnerabilities for full exploitation.

7.8 HIGH

📋 TL;DR

CVE-2021-39088 is a local privilege escalation vulnerability in IBM QRadar SIEM that allows authenticated local users to elevate their privileges to root/admin level. This affects IBM QRadar SIEM versions 7.3, 7.4, and 7.5. The vulnerability requires local access and could be combined with other unknown vulnerabilities for full exploitation.

💻 Affected Systems

Products:

IBM QRadar SIEM

Versions: 7.3, 7.4, 7.5

Operating Systems: Linux (QRadar appliance OS)

Default Config Vulnerable: ⚠️ Yes

Notes: Affects all deployments of the listed versions. Requires local authenticated access to exploit.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

An authenticated local attacker gains root privileges, potentially compromising the entire QRadar deployment, accessing sensitive security data, and using the system as a pivot point for further network attacks.

🟠

Likely Case

Malicious insider or compromised user account escalates privileges to gain unauthorized administrative access to the SIEM system.

🟢

If Mitigated

Limited impact due to strong access controls, proper user privilege management, and network segmentation isolating the SIEM.

🌐 Internet-Facing: LOW - This is a local privilege escalation requiring authenticated access to the system.

🏢 Internal Only: HIGH - Internal users with local access can exploit this to gain root privileges on critical security infrastructure.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires local authenticated access and potentially combination with other unknown vulnerabilities according to IBM's description.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Apply security patch from IBM - see vendor advisory for specific patch versions

Vendor Advisory: https://www.ibm.com/support/pages/node/6607129

Restart Required: Yes

Instructions:

1. Review IBM advisory at the provided URL. 2. Download appropriate security patch for your QRadar version. 3. Apply patch following IBM's documented procedures. 4. Restart QRadar services as required.

🔧 Temporary Workarounds

Restrict Local Access

linux

Limit local shell access to QRadar systems to only authorized administrators

# Review and restrict SSH access in /etc/ssh/sshd_config
# Implement sudo restrictions for non-admin users

Implement Least Privilege

linux

Ensure users only have necessary privileges and monitor for privilege escalation attempts

# Review user accounts and group memberships
# Implement audit logging for privilege changes

🧯 If You Can't Patch

Implement strict access controls limiting local login to only essential administrative users
Monitor for privilege escalation attempts using QRadar's own logging capabilities and external monitoring

🔍 How to Verify

Check if Vulnerable:

Check QRadar version via Admin interface or command line: /opt/qradar/bin/qradar_versions

Check Version:

/opt/qradar/bin/qradar_versions

Verify Fix Applied:

Verify patch installation via QRadar Admin interface under System & License Management > Updates, or check patch logs

📡 Detection & Monitoring

Log Indicators:

Unusual privilege escalation attempts in system logs
Unexpected root/admin user activity
Failed sudo/su attempts followed by successful escalation

Network Indicators:

Unusual SSH connections to QRadar systems from non-admin workstations

SIEM Query:

Use QRadar's own log sources to monitor for privilege escalation patterns in system authentication logs

📊 Metadata

CVE ID: CVE-2021-39088

CVSS v3 Score: 7.8 (HIGH)

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

Published: July 28, 2022

Last Updated: November 21, 2024

🔗 References

https://exchange.xforce.ibmcloud.com/vulnerabilities/216111 VDB Entry,Vendor Advisory
https://www.ibm.com/support/pages/node/6607129 Patch,Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/216111 VDB Entry,Vendor Advisory
https://www.ibm.com/support/pages/node/6607129 Patch,Vendor Advisory

📋 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

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

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

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

Restrict Local Access

Implement Least Privilege

🧯 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

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