CVE-2020-4001 Overview
CVE-2020-4001 is a hardcoded credentials vulnerability in VMware SD-WAN Orchestrator versions 3.3.2, 3.4.x, and 4.0.x. The product ships with default passwords for predefined accounts, exposing the management plane to Pass-the-Hash attacks. An unauthenticated attacker with network access to the Orchestrator can authenticate using the known default credentials and gain control of the SD-WAN management plane. VMware tracks this issue under advisory VMSA-2020-0025 and classifies it under [CWE-1188: Insecure Default Initialization of Resource]. The flaw affects deployments where administrators did not rotate the predefined account passwords after installation.
Critical Impact
Unauthenticated network attackers can authenticate to SD-WAN Orchestrator using shipped default credentials, leading to full compromise of the SD-WAN management plane and downstream Edge devices.
Affected Products
- VMware SD-WAN Orchestrator 3.3.2 (including patches p1 and p2)
- VMware SD-WAN Orchestrator 3.4.x
- VMware SD-WAN Orchestrator 4.0.x
Discovery Timeline
- 2020-11-24 - CVE-2020-4001 published to NVD and disclosed in VMware advisory VMSA-2020-0025
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2020-4001
Vulnerability Analysis
The SD-WAN Orchestrator distributes installation images containing predefined user accounts with static, well-known passwords. Because these credentials are identical across installations, any attacker who learns them can authenticate to any unpatched Orchestrator instance. The credentials are stored as hashes within the authentication subsystem, enabling Pass-the-Hash attacks where the attacker reuses the credential material without recovering the plaintext password. VMware SD-WAN Orchestrator centrally manages SD-WAN Edge appliances, configuration policies, and tenant data. Compromise of the Orchestrator therefore cascades into the entire managed network: traffic policies, VPN tunnels, and routing configurations can be altered or exfiltrated. The flaw maps to [CWE-1188], which covers insecure default initialization of resources.
Root Cause
The root cause is a product packaging decision: shipping predefined administrator and service accounts with credentials baked into the distribution. Operators who deploy the Orchestrator without explicitly rotating each predefined account leave the system exposed. The credentials are predictable across all installations of the affected versions.
Attack Vector
The attack vector is network-based and requires no prior authentication or user interaction. An attacker who can reach the Orchestrator management interface, either directly on the internet or after gaining a foothold inside the network, submits the known default credentials or their hash to the authentication endpoint. Successful authentication grants administrative access to manage Edges, push configurations, and read tenant data.
No verified public proof-of-concept code is referenced in the enriched data for this CVE. Refer to the VMware Security Advisory VMSA-2020-0025 for vendor technical details.
Detection Methods for CVE-2020-4001
Indicators of Compromise
- Successful logins to SD-WAN Orchestrator predefined accounts from unexpected source IPs or outside business hours.
- Configuration changes to Edge devices, routing policies, or tenant settings that do not correlate with an authorized change ticket.
- New administrative accounts or API tokens created on the Orchestrator without an audit trail.
Detection Strategies
- Audit Orchestrator authentication logs for sign-ins to predefined or built-in service accounts and flag any usage as suspicious.
- Correlate Orchestrator API activity with known administrator identities and investigate any unattributed sessions.
- Compare running configurations against a known-good baseline to identify unauthorized policy or Edge configuration changes.
Monitoring Recommendations
- Forward Orchestrator authentication and audit logs to a centralized SIEM with alerting on default account usage.
- Monitor network flows to the Orchestrator management interface and alert on connections from outside approved administrative networks.
- Track Edge device check-ins for configuration drift that could indicate attacker-initiated changes.
How to Mitigate CVE-2020-4001
Immediate Actions Required
- Apply the fixes listed in VMware Security Advisory VMSA-2020-0025 to all SD-WAN Orchestrator instances running 3.3.2, 3.4.x, or 4.0.x.
- Rotate the passwords of all predefined Orchestrator accounts immediately, even on patched systems.
- Restrict network access to the Orchestrator management interface to a hardened administrative subnet or VPN.
Patch Information
VMware addressed the issue in updates referenced by advisory VMSA-2020-0025. Administrators should upgrade to a fixed release of SD-WAN Orchestrator and verify that the post-installation hardening steps documented by VMware were applied. Patching alone does not remove credentials that were already exposed, so rotate all predefined account passwords as part of the remediation.
Workarounds
- Disable or rename all predefined accounts that are not required for operations and enforce strong, unique passwords on those that remain.
- Place the Orchestrator behind a firewall and limit inbound access to known administrative source addresses.
- Enable multi-factor authentication for all administrative access paths where the platform supports it.
# Example: restrict access to the Orchestrator management interface with iptables
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
