How to remediate – Sun Java System ASP Server Detection

1. Introduction

Sun Java System ASP Server Detection identifies an application server listening on a remote host. This indicates a potentially outdated web server component is running, which could be vulnerable to known attacks. Systems typically affected are those previously using Sun Java System Active Server Pages or older variants like Chili!Soft ASP. A successful exploit could compromise confidentiality, integrity, and availability of the server and any associated data.

2. Technical Explanation

The vulnerability arises from the presence of an active ASP Server component. Attackers can target these servers due to known weaknesses in their handling of requests or configurations. Exploitation requires network access to the port where the service is listening. There are no specific CVEs directly associated with simply *detecting* the server, but older versions have documented vulnerabilities. For example, an attacker could send a crafted request designed to exploit a buffer overflow or code injection flaw in the ASP interpreter.

• Root cause: The presence of an outdated and potentially insecure application server component.
• Exploit mechanism: An attacker sends malicious input through HTTP requests targeting vulnerabilities within the ASP Server software.
• Scope: Affected platforms include servers running Sun Java System Active Server Pages or Chili!Soft ASP, particularly older versions.

3. Detection and Assessment

Confirming a vulnerable system involves checking for listening services and identifying their version. A quick check can reveal the presence of the server; thorough assessment requires detailed version information.

• Quick checks: Use netstat to identify processes listening on port 80 or 443, then examine process names for ‘asp’ or related terms.
• Scanning: Nessus plugin ID 16297 can detect Sun Java System ASP Server. This is an example only; results may vary.
• Logs and evidence: Examine web server logs for requests handled by the ASP interpreter, looking for unusual patterns or error messages.

netstat -an | grep :80 | grep LISTEN

4. Solution / Remediation Steps

Fixing this issue involves limiting access to the affected port and ideally removing or upgrading the vulnerable software.

4.1 Preparation

• Dependencies: Ensure no critical applications rely on the ASP Server functionality. Roll back plan: Restore configuration backups if issues arise.
• Change window needs: Coordinate with application owners for downtime, if required.

4.2 Implementation

1. Step 1: Block external access to port 80 and/or 443 using a firewall rule.
2. Step 2: If the ASP Server is no longer needed, uninstall it completely.
3. Step 3: If the server *is* required, investigate upgrading to a supported version or migrating to a more secure platform.

4.3 Config or Code Example

Before

# No firewall rule blocking port 80

After

iptables -A INPUT -p tcp --dport 80 -j DROP

4.4 Security Practices Relevant to This Vulnerability

List only practices that directly address this vulnerability type. Use neutral wording and examples instead of fixed advice.

• Practice 1: Least privilege – restrict network access to services based on need, reducing the attack surface.
• Practice 2: Patch cadence – regularly update software components to address known vulnerabilities.

4.5 Automation (Optional)

If suitable, provide a small script or infrastructure code that applies the fix at scale. Only include if safe and directly relevant.

# Example Ansible task to block port 80 with firewalld
- name: Block port 80 using firewalld
  firewalld:
    port: 80/tcp
    permanent: true
    state: disabled
    immediate: yes

5. Verification / Validation

Confirming the fix involves verifying that access to the port is blocked and re-scanning for the vulnerable service.

• Post-fix check: Use netstat again; no processes should be listening on port 80 or 443 related to ASP.
• Re-test: Re-run the Nessus scan (ID 16297); it should no longer report a vulnerability.
• Monitoring: Monitor firewall logs for blocked connections to port 80/443, indicating attempted access.

netstat -an | grep :80 | grep LISTEN # Should return no results

6. Preventive Measures and Monitoring

Suggest only measures that are relevant to the vulnerability type. Use “for example” to keep advice conditional, not prescriptive.

• Baselines: Update security baselines to include a requirement for blocking unnecessary ports like 80/443.
• Asset and patch process: Implement a regular review cycle for installed software, ensuring timely patching.

7. Risks, Side Effects, and Roll Back

• Risk or side effect 1: Blocking port 80 may disrupt legitimate web services; carefully assess dependencies first.
• Risk or side effect 2: Uninstalling software could break applications if not properly planned.
• Roll back: Restore firewall rules and server configurations from backups if issues occur.

8. References and Resources

Link only to sources that match this exact vulnerability. Use official advisories and trusted documentation.

• Vendor advisory or bulletin: http://www.sun.com/software/chilisoft/
• NVD or CVE entry: No specific CVE for detection, but search NVD for Chili!Soft ASP vulnerabilities.
• Product or platform documentation relevant to the fix: Refer to Sun Java System Active Server Pages documentation for upgrade paths.