How to remediate – McAfee Cloud Single Sign On User Interface Detection

1. Introduction

The McAfee Cloud Single Sign On User Interface Detection identifies a web server running the user interface for McAfee Cloud Single Sign On, formerly known as McAfee Cloud Identity Manager. This matters because the UI is an entry point to authentication services and could be targeted by attackers seeking access to your organisation’s accounts. Affected systems are typically those using McAfee’s cloud-based identity management solutions. A successful attack could compromise user credentials, leading to potential data breaches or service disruption.

2. Technical Explanation

The vulnerability indicates the presence of a publicly accessible web server hosting the McAfee Cloud Single Sign On interface. This isn’t an inherent flaw in the software itself but rather a risk stemming from exposure. An attacker could attempt to exploit known vulnerabilities within the UI or use it as a stepping stone for phishing attacks or credential harvesting. There is no specific CVE associated with simply running this service; the risk depends on the version and configuration of the McAfee Cloud Single Sign On system.

• Root cause: Publicly accessible web server hosting the McAfee Cloud Single Sign On user interface.
• Exploit mechanism: An attacker could attempt to exploit vulnerabilities in the UI, or use it for phishing attacks targeting users.
• Scope: Systems running McAfee Cloud Single Sign On (formerly McAfee Cloud Identity Manager).

3. Detection and Assessment

Confirming exposure involves checking for the presence of the web server and identifying its version. A thorough assessment requires reviewing the system’s configuration.

• Quick checks: Access the URL associated with your McAfee Cloud Single Sign On instance in a web browser. If accessible, it confirms the UI is running.
• Scanning: Nessus plugin ID 16879 can identify the presence of the McAfee Cloud SSO interface. This is provided as an example only.
• Logs and evidence: Web server access logs may show requests to the Single Sign On URL.

curl -I http://your-mcafee-cloud-sso-url.com

4. Solution / Remediation Steps

The primary remediation is to control access to the McAfee Cloud Single Sign On user interface.

4.1 Preparation

• Ensure you have administrator credentials for the McAfee Cloud SSO system. A roll back plan involves restoring from the snapshot.
• A change window may be needed depending on your organisation’s policies, and approval from security or IT management might be necessary.

4.2 Implementation

1. Step 1: Restrict access to the McAfee Cloud Single Sign On user interface using a firewall or network ACL. Allow only trusted IP addresses or networks.
2. Step 2: If possible, disable direct public access and require users to connect through a VPN or proxy server.

4.3 Config or Code Example

Before

# Firewall rule allowing access from any source
iptables -A INPUT -p tcp --dport 80 -j ACCEPT

After

# Firewall rule restricting access to trusted IP address range
iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP

4.4 Security Practices Relevant to This Vulnerability

Several security practices can help mitigate this risk.

• Practice 1: Least privilege – restrict access to sensitive systems and interfaces to only those who need it, reducing the attack surface.
• Practice 2: Network segmentation – isolate critical services like Single Sign On from public networks.

4.5 Automation (Optional)

If using infrastructure as code, update firewall rules to restrict access.

# Example Terraform snippet
resource "aws_security_group" "mcafee_sso_sg" {
  name        = "mcafee-sso-sg"
  description = "Security group for McAfee SSO UI"
  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["192.168.1.0/24"] # Replace with your trusted IP range
  }
  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

5. Verification / Validation

Confirm the fix by verifying access restrictions and performing a smoke test.

• Post-fix check: Attempt to access the McAfee Cloud Single Sign On UI from an untrusted IP address. Access should be denied.
• Re-test: Repeat the quick check (accessing the URL) from an untrusted network; it should now fail.
• Smoke test: Verify that authorized users can still log in to the system through their intended access method (e.g., VPN).
• Monitoring: Check firewall logs for blocked connection attempts to the McAfee Cloud Single Sign On UI from unexpected sources.

curl -I http://your-mcafee-cloud-sso-url.com # Should return a connection refused or access denied error

6. Preventive Measures and Monitoring

Proactive measures include regular security assessments and policy enforcement.

• Baselines: Update your network baseline to reflect restricted access to sensitive interfaces like McAfee Cloud Single Sign On.
• Pipelines: Include checks in your CI/CD pipeline to ensure firewall rules are correctly configured during deployment.
• Asset and patch process: Review the configuration of all externally facing systems regularly, at least quarterly.

7. Risks, Side Effects, and Roll Back

Incorrectly configuring access restrictions could disrupt legitimate user access.

• Risk or side effect 1: Blocking authorized users – ensure your trusted IP ranges are accurate to avoid service disruption.

8. References and Resources

Links relevant to this vulnerability.

• Vendor advisory or bulletin: http://www.mcafee.com/us/products/cloud-single-sign-on.aspx