1. Introduction
The remote host is running the Apache Storm WebUI. This vulnerability allows an attacker to determine the version of Apache Storm WebUI running on the system. Successful exploitation could allow attackers to identify known vulnerabilities in specific versions, potentially leading to further compromise. Confidentiality, integrity and availability may be impacted if a vulnerable version is exploited.
2. Technical Explanation
The Apache Storm WebUI exposes its version information which can be determined remotely. This allows an attacker to fingerprint the system and target it with specific exploits. There are no known active exploits but this information gathering step could lead to further attacks on vulnerable systems.
- Root cause: The Apache Storm WebUI does not sufficiently protect its version information.
- Exploit mechanism: An attacker can send a simple HTTP request to the WebUI and parse the response for version details.
- Scope: Affected platforms are those running the Apache Storm WebUI.
3. Detection and Assessment
You can confirm whether your system is vulnerable by checking the WebUI’s version information directly, or through network scanning.
- Quick checks: Access the Apache Storm WebUI in a web browser and inspect the page source for version numbers.
- Scanning: Nessus plugin ID 16823 can detect this issue. This is an example only.
- Logs and evidence: Review WebUI access logs for requests to identify potential reconnaissance attempts.
curl -I http://your-storm-webui-address4. Solution / Remediation Steps
There is no direct fix available for this vulnerability, as it relates to information disclosure. Mitigation focuses on reducing exposure and monitoring for reconnaissance attempts.
4.1 Preparation
- Backups are not required for this mitigation step. No services need to be stopped.
- Dependencies: Ensure you have access to the Apache Storm WebUI configuration files. A roll back plan is simply restoring any changes made to the WebUI configuration.
- Change window needs and approvals may depend on your organisation’s policies.
4.2 Implementation
- Step 1: Restrict access to the Apache Storm WebUI using firewall rules, allowing only trusted networks or users to connect.
- Step 2: Monitor network traffic for unauthorized access attempts to the WebUI.
4.3 Config or Code Example
There is no code change required. The mitigation involves restricting access through configuration.
Before
# No specific firewall rules in place for Apache Storm WebUIAfter
# Firewall rule to allow only trusted IP addresses to access the WebUI. Example using iptables:
iptables -A INPUT -p tcp --dport 8080 -s /32 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP 4.4 Security Practices Relevant to This Vulnerability
Several security practices can help mitigate this type of vulnerability.
- Practice 1: Least privilege – restricting access to the WebUI limits potential exposure.
- Practice 2: Network segmentation – isolating the WebUI on a separate network reduces attack surface.
4.5 Automation (Optional)
No automation is available for this mitigation step.
5. Verification / Validation
Confirm that access to the Apache Storm WebUI is restricted as configured, and monitor logs for any unauthorized attempts.
- Post-fix check: Attempt to access the WebUI from an untrusted network; access should be denied.
- Re-test: Re-run the quick checks described earlier from an untrusted source – you should not be able to retrieve version information.
- Smoke test: Verify that authorized users can still access and use the WebUI functionality.
- Monitoring: Monitor firewall logs for dropped connections to port 8080 (or your configured WebUI port).
# Example iptables output showing blocked connection attempts:
iptables -L INPUT6. Preventive Measures and Monitoring
Preventive measures include regular security assessments and network monitoring.
- Baselines: Update your network baseline to include restrictions on access to sensitive services like the Apache Storm WebUI.
- Pipelines: Incorporate vulnerability scanning into your CI/CD pipeline to identify potential information disclosure issues early in the development lifecycle.
- Asset and patch process: Maintain an inventory of all running services, including versions, and establish a regular review cycle.
7. Risks, Side Effects, and Roll Back
Restricting access could potentially disrupt legitimate users if not configured correctly.
- Risk or side effect 1: Blocking authorized user access – ensure proper IP address whitelisting.
- Roll back: Remove the firewall rules added in Step 2 to restore full access to the WebUI.
8. References and Resources
Links related to Apache Storm.
- Vendor advisory or bulletin: http://storm.apache.org
- NVD or CVE entry: No specific CVE is associated with this information disclosure issue.
- Product or platform documentation relevant to the fix: https://storm.apache.org/documentation/Setup.html