1. Introduction
The Symantec Data Center Security Server ‘WCUnsupportedClass.jsp’ XSS vulnerability allows an attacker to inject malicious scripts into a web page viewed by other users. This could lead to the theft of cookies, session hijacking, or defacement of the application. Affected systems are typically those running Symantec Data Center Security Server exposed to network access. A successful exploit can compromise confidentiality, integrity and availability.
2. Technical Explanation
The vulnerability is caused by insufficient validation of input provided to the ‘classname’ parameter within the ‘WCUnsupportedClass.jsp’ script. An attacker can supply a crafted payload that is then executed in the context of another user’s browser. There is currently no known Common Vulnerabilities and Exposures (CVE) identifier for this issue.
- Exploit mechanism: An attacker crafts a URL containing a malicious JavaScript payload within the ‘classname’ parameter, then tricks a victim into visiting that URL. When the victim visits the link, the script executes. For example:
http://example.com/WCUnsupportedClass.jsp?classname= - Scope: Symantec Data Center Security Server is affected. Specific versions are not detailed in the available information.
3. Detection and Assessment
Confirming vulnerability requires checking for the presence of the vulnerable script and testing its input validation. A thorough assessment involves attempting to inject a simple XSS payload.
- Quick checks: Verify the Symantec Data Center Security Server is running on the target system using standard OS commands or application UI.
- Scanning: Nessus vulnerability ID 9761dcce can identify this issue, but results should be manually verified.
- Logs and evidence: Examine web server logs for requests to ‘WCUnsupportedClass.jsp’ with suspicious parameters. Look for the ‘classname’ parameter containing HTML tags or JavaScript code.
# Example command placeholder:
# ps -ef | grep symantec
4. Solution / Remediation Steps
As there is no known fix, access restriction is currently the only mitigation. Follow these steps to reduce risk.
4.1 Preparation
- Ensure you have documented the current configuration for rollback purposes. A roll back plan involves restoring from the snapshot or restarting the service with its original settings.
- Changes should be made during a scheduled maintenance window, and approved by the security team.
4.2 Implementation
- Step 1: Restrict network access to the Symantec Data Center Security Server application using firewall rules or access control lists (ACLs). Allow only trusted IP addresses or networks to connect.
- Step 2: If possible, disable or remove the ‘WCUnsupportedClass.jsp’ script if it is not essential for functionality.
4.3 Config or Code Example
Before
# No specific configuration example available, as this is an input validation issue within the script itself. Access control lists are used for mitigation.
After
# Example firewall rule (iptables):
# 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 prevent this type of issue.
- Practice 2: Least privilege limits the impact if an attacker gains access. Restrict application access to only those users and networks that require it.
4.5 Automation (Optional)
Automation is not directly applicable for this vulnerability without a patch, but infrastructure-as-code can be used to manage firewall rules.
# Example Ansible snippet:
# - name: Block access to Symantec Data Center Security Server
# firewalld:
# state: enabled
# zone: public
# rich_rule: 'rule family="ipv4" source address="0.0.0.0/0" port protocol=tcp port=80 reject'
5. Verification / Validation
Confirm the fix by attempting to access the vulnerable script from an untrusted network and verifying that access is blocked.
- Post-fix check: Attempt to access
http://example.com/WCUnsupportedClass.jsp?classname=from a non-trusted IP address. Expect a connection refusal or an error message indicating access is denied. - Re-test: Re-run the Nessus scan (ID 9761dcce) and confirm that it no longer reports the vulnerability.
- Smoke test: Verify that legitimate users can still access other application features without interruption.
- Monitoring: Monitor web server logs for blocked requests to ‘WCUnsupportedClass.jsp’ from untrusted sources as an example of regression detection.
# Example command and expected output (iptables):
# iptables -L INPUT | grep 80
# ... DROP tcp -- anywhere anywhere tcp dpt:http
6. Preventive Measures and Monitoring
Update security baselines and incorporate checks into your development pipeline.
- Baselines: Update a web server security baseline to include input validation requirements.
- Pipelines: Add Static Application Security Testing (SAST) tools to the CI/CD pipeline to identify potential XSS vulnerabilities during development.
- Asset and patch process: Implement a regular review cycle for application configurations and dependencies, focusing on known vulnerabilities.
7. Risks, Side Effects, and Roll Back
Restricting access may impact legitimate users if not configured correctly.
- Risk or side effect 1: Blocking legitimate traffic. Mitigation involves carefully defining allowed IP addresses and networks.
- Roll back: Step 1: Remove the firewall rules blocking access to ‘WCUnsupportedClass.jsp’. Step 2: Restart the Symantec Data Center Security Server service.
8. References and Resources
Link only to sources that match this exact vulnerability.
- Vendor advisory or bulletin: http://www.nessus.org/u?9761dcce
- NVD or CVE entry: Not available at this time.
- Product or platform documentation relevant to the fix: Refer to Symantec Data Center Security Server documentation for firewall configuration options.