CVE-2023-20877: VMware Aria Operations Escalation Flaw

CVE-2023-20877 Overview

CVE-2023-20877 is a privilege escalation vulnerability affecting VMware Aria Operations (formerly vRealize Operations). An authenticated malicious user with ReadOnly privileges can perform code execution leading to privilege escalation. This vulnerability allows attackers with minimal access rights to gain elevated privileges within the VMware Aria Operations environment.

Critical Impact

Authenticated attackers with low-privilege ReadOnly access can escalate privileges and execute arbitrary code, potentially gaining full administrative control over VMware Aria Operations infrastructure.

Affected Products

• VMware vRealize Operations 8.6.0 (including Hotfix1 through Hotfix9)
• VMware vRealize Operations 8.10.0 (including Hotfix1 and Hotfix2)
• VMware Cloud Foundation (versions utilizing affected vRealize Operations)

Discovery Timeline

• May 12, 2023 - CVE-2023-20877 published to NVD
• January 27, 2025 - Last updated in NVD database

Technical Details for CVE-2023-20877

Vulnerability Analysis

This privilege escalation vulnerability in VMware Aria Operations stems from improper authorization controls (CWE-863). The vulnerability allows an authenticated user with ReadOnly privileges to bypass intended access restrictions and execute code with elevated privileges. The network-based attack vector means that any authenticated user with network access to the VMware Aria Operations management interface can potentially exploit this vulnerability without requiring any user interaction.

The exploitation requires only low-privilege credentials, making it particularly dangerous in environments where multiple users have ReadOnly access to the operations platform. Once exploited, attackers can compromise the confidentiality, integrity, and availability of managed systems.

Root Cause

The root cause of CVE-2023-20877 is classified under CWE-863 (Incorrect Authorization). The VMware Aria Operations application fails to properly validate authorization when processing certain operations, allowing users with ReadOnly privileges to execute actions that should be restricted to higher-privileged accounts. This improper authorization check enables privilege escalation through code execution.

Attack Vector

The attack is conducted over the network and requires the attacker to have valid authentication credentials with at least ReadOnly privileges. The exploitation does not require user interaction and can be executed remotely. An attacker would:

1. Authenticate to VMware Aria Operations with a ReadOnly account
2. Exploit the improper authorization controls to execute code
3. Leverage the code execution capability to escalate privileges
4. Gain elevated access to the VMware Aria Operations environment

The vulnerability mechanism involves bypassing authorization checks that should prevent ReadOnly users from executing privileged operations. For detailed technical information, refer to the VMware Security Advisory VMSA-2023-0009.

Detection Methods for CVE-2023-20877

Indicators of Compromise

• Unusual API calls or operations initiated by ReadOnly user accounts
• Unexpected privilege changes or role modifications in VMware Aria Operations
• Anomalous code execution attempts from low-privileged sessions
• Authentication logs showing ReadOnly accounts performing administrative actions

Detection Strategies

• Monitor VMware Aria Operations audit logs for authorization bypass attempts
• Implement behavioral analysis to detect ReadOnly users performing privileged operations
• Configure SIEM rules to alert on privilege escalation patterns in virtualization management platforms
• Review user activity logs for anomalous access patterns from low-privileged accounts

Monitoring Recommendations

• Enable comprehensive audit logging in VMware Aria Operations environments
• Deploy network monitoring to detect unusual traffic patterns to Aria Operations management interfaces
• Implement user behavior analytics (UBA) to identify privilege escalation attempts
• Establish baseline activity profiles for ReadOnly accounts and alert on deviations

How to Mitigate CVE-2023-20877

Immediate Actions Required

• Apply the security patches referenced in VMware Security Advisory VMSA-2023-0009 immediately
• Review all user accounts with ReadOnly access and remove unnecessary accounts
• Implement network segmentation to restrict access to VMware Aria Operations management interfaces
• Enable enhanced logging and monitoring for all Aria Operations user activities

Patch Information

VMware has released security patches to address this vulnerability. Administrators should consult the VMware Security Advisory VMSA-2023-0009 for specific patch versions and upgrade instructions for VMware vRealize Operations 8.6.0 and 8.10.0 deployments. For VMware Cloud Foundation environments, follow the corresponding guidance for integrated vRealize Operations upgrades.

Workarounds

• Restrict network access to VMware Aria Operations management interfaces using firewall rules
• Implement strict access controls and limit the number of accounts with any level of access
• Consider temporarily disabling ReadOnly accounts until patches can be applied
• Deploy additional monitoring and alerting for VMware Aria Operations environments

# Example: Restrict network access to Aria Operations management interface
# Configure firewall to limit access to trusted management networks only
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_MGMT_NETWORK -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Review current user accounts with ReadOnly access
# Audit user roles through VMware Aria Operations administration console