CVE-2022-21432: Oracle Database RDBMS DOS Vulnerability

CVE-2022-21432 Overview

CVE-2022-21432 is a vulnerability in the Oracle Database - Enterprise Edition RDBMS Security component of Oracle Database Server. This security flaw allows a high privileged attacker with DBA role privilege and network access via Oracle Net to compromise the RDBMS Security component, potentially causing a partial denial of service condition.

Critical Impact

Successful exploitation can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Database - Enterprise Edition RDBMS Security, impacting database availability for legitimate users.

Affected Products

• Oracle Database 12.1.0.2
• Oracle Database 19c Enterprise Edition
• Oracle Database 21c Enterprise Edition

Discovery Timeline

• 2022-07-19 - CVE-2022-21432 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-21432

Vulnerability Analysis

This vulnerability resides within the RDBMS Security component of Oracle Database Enterprise Edition. The flaw is characterized by its ease of exploitation once an attacker has obtained the necessary high-privilege access. The attack requires DBA role privileges and network access via Oracle Net protocol to the target database server.

The vulnerability specifically impacts the availability of the database system rather than compromising data confidentiality or integrity. When exploited, the attack results in a partial denial of service condition, which could disrupt normal database operations for legitimate users and applications relying on the affected Oracle Database instance.

Root Cause

The specific root cause details have not been publicly disclosed by Oracle. The vulnerability is classified under "NVD-CWE-noinfo," indicating that the exact weakness type has not been categorized. However, the nature of the vulnerability—causing partial denial of service within the RDBMS Security component—suggests an improper handling of certain security-related operations that can be triggered by privileged users with network access.

Attack Vector

The attack vector for CVE-2022-21432 requires the following conditions:

1. High Privileges: The attacker must possess DBA role privileges on the target Oracle Database instance
2. Network Access: The attacker needs network connectivity to the database via Oracle Net protocol
3. No User Interaction: The vulnerability can be exploited without requiring any action from other users

The exploitation occurs over the network through Oracle Net, which is Oracle's networking layer that enables client-to-database and database-to-database communication. An attacker meeting these prerequisites can trigger the vulnerability to cause partial service disruption to the RDBMS Security component.

Detection Methods for CVE-2022-21432

Indicators of Compromise

• Unusual DBA account activity from unexpected network locations or IP addresses
• Abnormal spikes in Oracle Net connection attempts or failures
• Unexpected partial service disruptions in the RDBMS Security component
• Audit log entries showing security component anomalies from privileged accounts

Detection Strategies

• Monitor Oracle audit logs for suspicious DBA role activities targeting security components
• Implement network traffic analysis on Oracle Net protocol ports (default TCP 1521)
• Configure alerts for repeated security component failures or restarts
• Review Oracle listener logs for unusual connection patterns from privileged accounts

Monitoring Recommendations

• Enable Oracle Database Audit Vault to capture and analyze privileged user activities
• Implement continuous monitoring of DBA account sessions and their operations
• Set up automated alerts for partial denial of service conditions in database components
• Regularly review Oracle Enterprise Manager alerts for security component anomalies

How to Mitigate CVE-2022-21432

Immediate Actions Required

• Apply the Oracle Critical Patch Update (CPU) from July 2022 immediately
• Review and restrict DBA role privileges to only essential personnel
• Implement network segmentation to limit Oracle Net access to trusted networks
• Enable comprehensive auditing on all DBA role activities

Patch Information

Oracle has addressed this vulnerability in the July 2022 Critical Patch Update. Organizations running affected versions (12.1.0.2, 19c, or 21c) should apply the security patches as documented in the Oracle Security Alert July 2022.

To verify patch status, database administrators can query the registry for applied patches using Oracle's opatch utility or check the DBA_REGISTRY_SQLPATCH view.

Workarounds

• Restrict network access to Oracle Net by implementing firewall rules limiting connections to known, trusted IP addresses
• Implement strict privilege management by regularly auditing DBA role assignments and removing unnecessary privileges
• Use Oracle Database Vault to add additional layers of protection around sensitive security operations
• Consider implementing Oracle Label Security for additional access controls on sensitive data

# Example: Check current patch level
$ORACLE_HOME/OPatch/opatch lspatches

# Example: Review DBA role grants
sqlplus / as sysdba <<EOF
SELECT grantee, granted_role 
FROM dba_role_privs 
WHERE granted_role = 'DBA';
EOF