1. Introduction
The web user interface for Cisco Unified Computing System (UCS) Central Software was detected on the remote host. This vulnerability indicates that a management system is exposed via HTTP, which could allow attackers to gain access to sensitive information and potentially compromise the entire infrastructure. Systems affected are typically those running Cisco UCS Central Software. A successful exploit could lead to confidentiality, integrity, and availability impacts.
2. Technical Explanation
The vulnerability stems from the presence of a web user interface accessible over HTTP. While not directly exploitable as a code execution flaw, it presents an attack surface for credential harvesting, man-in-the-middle attacks, and other forms of interception. There is no known CVE associated with this detection; however, it represents a configuration issue that should be addressed. An attacker could intercept traffic to the web UI and steal credentials or session cookies. Affected platforms are those running Cisco UCS Central Software.
- Root cause: The web interface is accessible over an insecure protocol (HTTP).
- Exploit mechanism: An attacker can use tools like Wireshark or Burp Suite to intercept traffic and capture sensitive data sent over HTTP.
- Scope: Cisco Unified Computing System (UCS) Central Software installations.
3. Detection and Assessment
To confirm whether a system is vulnerable, check for the presence of the web interface and verify it’s accessible via HTTP. A thorough method involves network scanning.
- Quick checks: Use a web browser to access the UCS Central Software management interface using its default or configured IP address and port (typically 80).
- Scanning: Nessus plugin ID 139254 can identify this issue. This is an example only, other scanners may also provide detection capabilities.
- Logs and evidence: Check web server logs for access attempts to the UCS Central Software interface. Look for requests originating from external sources.
# Example command placeholder:
# nmap -p 80
4. Solution / Remediation Steps
The following steps provide a precise method to fix the issue.
4.1 Preparation
- No services need to be stopped for this remediation. Approval may be required by change management depending on your organisation’s policies.
4.2 Implementation
- Step 1: Configure UCS Central Software to redirect all HTTP traffic to HTTPS.
- Step 2: Verify that the web interface is no longer accessible via HTTP and only accessible via HTTPS.
4.3 Config or Code Example
Before
# Web interface accessible via HTTP (example)
http:///
After
# Web interface only accessible via HTTPS (example)
https:///
# HTTP traffic automatically redirected to HTTPS.
4.4 Security Practices Relevant to This Vulnerability
Practices that directly address this vulnerability type include secure defaults and encryption in transit.
- Practice 1: Enforce HTTPS for all web interfaces to protect data in transit.
- Practice 2: Implement HTTP Strict Transport Security (HSTS) to prevent downgrade attacks.
4.5 Automation (Optional)
# No automation available for this specific remediation step as it requires configuration changes within the UCS Central Software UI.
5. Verification / Validation
Confirm that the fix worked by verifying HTTPS is enforced and HTTP access is blocked. Perform a service smoke test to ensure functionality remains intact.
- Post-fix check: Attempt to access the UCS Central Software interface via HTTP in a web browser; it should redirect to HTTPS or display an error message.
- Re-test: Re-run the quick check from Section 3 to confirm that the web interface is no longer accessible via HTTP.
- Smoke test: Log into the UCS Central Software interface via HTTPS and verify basic functionality, such as server status and inventory information.
- Monitoring: Monitor web server logs for any failed attempts to access the interface via HTTP.
# Post-fix command and expected output
# Attempting to access http:/// should redirect to https:/// or show an error message.
6. Preventive Measures and Monitoring
Update security baselines to enforce HTTPS for all web interfaces. Implement CI/CD pipeline checks to prevent insecure configurations.
- Baselines: Update your security baseline to require HTTPS for all web applications, including Cisco UCS Central Software.
- Pipelines: Add a check in your CI/CD pipeline to scan for any services exposed over HTTP and flag them as a security issue.
- Asset and patch process: Review configurations regularly to ensure they adhere to security best practices.
7. Risks, Side Effects, and Roll Back
The primary risk is potential service disruption if HTTPS configuration is incorrect. The roll back steps involve restoring the UCS Central Software configuration from backup.
- Risk or side effect 1: Incorrect HTTPS configuration may prevent access to the web interface. Mitigation involves verifying the certificate and DNS settings.
- Roll back: Restore the UCS Central Software configuration from the pre-change backup.
8. References and Resources
- Vendor advisory or bulletin: Cisco UCS Central Software Support
- NVD or CVE entry: Not applicable, as this is a configuration issue rather than a specific vulnerability with a CVE ID.
- Product or platform documentation relevant to the fix: Cisco UCS Central Software Configuration Guide