CVE-2022-21510: Oracle Database Privilege Escalation Flaw

CVE-2022-21510 Overview

CVE-2022-21510 is a privilege escalation vulnerability in the Oracle Database - Enterprise Edition Sharding component of Oracle Database Server. This vulnerability allows a low-privileged attacker with Local Logon privileges to compromise the Oracle Database - Enterprise Edition Sharding component, potentially leading to a complete system takeover with significant impact on confidentiality, integrity, and availability.

Critical Impact

Successful exploitation enables attackers with local access to achieve full compromise of Oracle Database Enterprise Edition Sharding, with the potential to significantly impact additional products due to scope change.

Affected Products

• Oracle Database - Enterprise Edition
• Oracle Database - Enterprise Edition Sharding Component

Discovery Timeline

• 2022-07-19 - CVE CVE-2022-21510 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-21510

Vulnerability Analysis

This vulnerability exists within the Sharding component of Oracle Database Enterprise Edition. The flaw is characterized as easily exploitable, requiring only low-privileged access with Local Logon capabilities. The attack does not require user interaction, making it particularly dangerous in shared computing environments where multiple users have local access to database infrastructure.

What makes this vulnerability especially concerning is the scope change characteristic—while the initial vulnerability exists in the Sharding component, successful exploitation can significantly impact additional products and components beyond the originally compromised system. This means attackers can pivot from the initial compromise to affect other systems or services that interact with or depend on the Oracle Database infrastructure.

The vulnerability allows complete takeover of the Oracle Database Enterprise Edition Sharding component, resulting in total loss of confidentiality, integrity, and availability of the affected system.

Root Cause

The specific technical root cause has not been disclosed by Oracle (classified as NVD-CWE-noinfo). Based on the vulnerability characteristics—local access requirement, privilege escalation capability, and scope change—the issue likely involves improper privilege management or insufficient access controls within the Sharding component that allows authenticated local users to elevate their privileges beyond intended boundaries.

Attack Vector

The attack vector is local, meaning an attacker must first gain access to the infrastructure where Oracle Database Enterprise Edition Sharding is installed. The attack path involves:

1. Attacker gains local logon access to the target system (even with low privileges)
2. Attacker interacts with the Sharding component using their existing access
3. The vulnerability is exploited to escalate privileges within the Oracle Database environment
4. Full compromise of the Sharding component is achieved
5. Due to scope change, the attacker may pivot to impact additional products

The vulnerability is easily exploitable with low attack complexity, requiring no special conditions or user interaction beyond the initial local access.

Detection Methods for CVE-2022-21510

Indicators of Compromise

• Unusual privilege escalation attempts or successful privilege changes for low-privileged database users
• Unexpected processes spawned by the Oracle Database Sharding component
• Anomalous access patterns to Sharding-related database objects or configuration files
• Suspicious local authentication events followed by database administrative actions

Detection Strategies

• Monitor Oracle Database audit logs for privilege escalation attempts and unauthorized administrative actions
• Implement database activity monitoring (DAM) solutions to detect anomalous query patterns and privilege changes
• Enable Oracle Unified Auditing with focus on ALTER SYSTEM, CREATE USER, and other sensitive operations
• Configure SentinelOne endpoint protection to detect suspicious process behavior on database servers

Monitoring Recommendations

• Enable comprehensive logging for all Oracle Database authentication and authorization events
• Monitor file system activity on database server infrastructure for unauthorized access to Sharding component files
• Track network connections originating from database processes that may indicate lateral movement
• Review Oracle alert logs and trace files for unusual error patterns or component failures

How to Mitigate CVE-2022-21510

Immediate Actions Required

• Apply the Oracle Critical Patch Update (CPU) from July 2022 immediately
• Restrict local logon privileges to only essential personnel and service accounts
• Review and audit all users with Local Logon access to Oracle Database infrastructure
• Implement network segmentation to limit access to database server systems

Patch Information

Oracle has addressed this vulnerability in the Oracle Critical Patch Update July 2022. Organizations should apply the latest available patches for Oracle Database Enterprise Edition to remediate this vulnerability. According to Oracle's advisory, none of the currently supported versions are affected after applying the recommended patches.

Workarounds

• Restrict local logon access to database servers using operating system-level controls and group policies
• Implement the principle of least privilege for all database accounts and service accounts
• Enable comprehensive auditing on the Oracle Database to detect exploitation attempts
• Consider implementing Oracle Database Vault to enforce separation of duties and prevent unauthorized privilege escalation

# Example: Restrict local logon access on Linux systems
# Add database server to restricted access group
usermod -aG oracle_db_admins authorized_user

# Configure PAM to restrict local logon
# Add to /etc/security/access.conf
# - : ALL EXCEPT oracle_db_admins : LOCAL

# Enable Oracle unified auditing for privilege escalation monitoring
# SQL command to enable auditing
# ALTER SYSTEM SET audit_trail=db,extended SCOPE=SPFILE;