CVE-2021-2137: Oracle Enterprise Manager Privilege Escalation

CVE-2021-2137 Overview

CVE-2021-2137 is a critical vulnerability affecting the Policy Framework component of Oracle Enterprise Manager Base Platform. This vulnerability allows a low privileged attacker with network access via HTTP to completely compromise the Enterprise Manager Base Platform, resulting in full system takeover with impacts to confidentiality, integrity, and availability.

Critical Impact

Successful exploitation enables complete takeover of Enterprise Manager Base Platform, allowing attackers to gain full control over monitored infrastructure and sensitive enterprise data.

Affected Products

• Oracle Enterprise Manager Base Platform version 13.4.0.0
• Oracle Enterprise Manager Base Platform version 13.5.0.0

Discovery Timeline

• October 20, 2021 - CVE-2021-2137 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2021-2137

Vulnerability Analysis

This vulnerability resides in the Policy Framework component of Oracle Enterprise Manager Base Platform, a critical enterprise infrastructure management solution used by organizations to monitor and manage their IT environments. The vulnerability is characterized as easily exploitable, requiring only low-level privileges and network access via HTTP to successfully compromise the target system.

The attack can be executed remotely without requiring any user interaction, making it particularly dangerous in enterprise environments where Enterprise Manager instances are often accessible across internal networks. A successful attack results in complete takeover of the Enterprise Manager Base Platform, giving attackers full control over the monitoring and management infrastructure.

Root Cause

While Oracle has not disclosed the specific technical root cause (classified as NVD-CWE-noinfo), the vulnerability exists within the Policy Framework component's handling of authenticated requests. The flaw allows attackers with minimal privileges to escalate their access and gain complete control over the system. The Policy Framework is responsible for defining and enforcing policies across managed environments, making this a particularly sensitive attack surface.

Attack Vector

The attack is executed over the network via HTTP, targeting the Policy Framework component. An attacker with low-level authenticated access to the Enterprise Manager can exploit this vulnerability to achieve complete system compromise. The attack does not require user interaction, meaning it can be automated and executed at scale against vulnerable instances.

The exploitation flow involves:

1. Attaining low-privileged access to the Enterprise Manager Base Platform
2. Sending specially crafted HTTP requests to the Policy Framework component
3. Exploiting the vulnerability to escalate privileges
4. Achieving complete takeover of the Enterprise Manager instance

Detection Methods for CVE-2021-2137

Indicators of Compromise

• Unusual HTTP requests targeting Policy Framework endpoints from low-privileged users
• Unexpected privilege escalation events in Enterprise Manager audit logs
• Anomalous administrative actions performed by non-administrative accounts
• New or modified policies created without authorized administrator action

Detection Strategies

• Monitor Enterprise Manager audit logs for privilege escalation attempts and unauthorized policy modifications
• Implement network-level monitoring for suspicious HTTP traffic patterns targeting Enterprise Manager instances
• Configure alerts for administrative actions performed by low-privileged accounts
• Review authentication logs for unusual login patterns or access from unexpected sources

Monitoring Recommendations

• Enable comprehensive audit logging in Oracle Enterprise Manager Base Platform
• Deploy network intrusion detection systems (IDS) to monitor HTTP traffic to Enterprise Manager endpoints
• Implement Security Information and Event Management (SIEM) rules to correlate suspicious Enterprise Manager activities
• Regularly review user access levels and remove unnecessary privileges

How to Mitigate CVE-2021-2137

Immediate Actions Required

• Apply the Oracle Critical Patch Update (CPU) from October 2021 immediately
• Review and restrict network access to Enterprise Manager Base Platform instances
• Audit all user accounts with access to Enterprise Manager and enforce least privilege principles
• Monitor for suspicious activity while patches are being deployed

Patch Information

Oracle has addressed this vulnerability in the October 2021 Critical Patch Update. Administrators should apply the relevant patches for Oracle Enterprise Manager Base Platform versions 13.4.0.0 and 13.5.0.0 as documented in the Oracle Critical Patch Update Advisory. Organizations should follow their standard change management procedures while prioritizing this high-severity vulnerability.

Workarounds

• Restrict network access to Enterprise Manager instances using firewall rules and network segmentation
• Implement additional authentication controls such as multi-factor authentication for Enterprise Manager access
• Disable or restrict access to the Policy Framework component for non-essential users until patches can be applied
• Consider placing Enterprise Manager behind a VPN or reverse proxy with additional access controls

# Example: Restrict network access to Enterprise Manager using iptables
# Replace <TRUSTED_NETWORK> with your authorized IP range
iptables -A INPUT -p tcp --dport 7799 -s <TRUSTED_NETWORK> -j ACCEPT
iptables -A INPUT -p tcp --dport 7799 -j DROP

# Verify Enterprise Manager version to confirm patch status
emctl status oms -details | grep -i version