CVE-2021-23273
📋 TL;DR
This vulnerability allows low-privileged attackers with network access to execute stored cross-site scripting (XSS) attacks in TIBCO Spotfire products. Successful exploitation requires human interaction from someone other than the attacker. Affected systems include various versions of TIBCO Spotfire Analyst, Desktop, Server, and Analytics Platform for AWS Marketplace.
💻 Affected Systems
- TIBCO Spotfire Analyst
- TIBCO Spotfire Analytics Platform for AWS Marketplace
- TIBCO Spotfire Desktop
- TIBCO Spotfire Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, credentials, or sensitive data from authenticated users, potentially leading to account takeover, data exfiltration, or further system compromise.
Likely Case
Attackers could perform session hijacking, deface content, or redirect users to malicious sites, compromising user accounts and data confidentiality.
If Mitigated
With proper input validation and output encoding, the attack would fail to execute malicious scripts, limiting impact to benign payload display.
🎯 Exploit Status
Requires low-privileged network access and human interaction (victim must interact with malicious content). Stored XSS means payload persists in the application.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after those listed in affected versions - check specific product advisory
Vendor Advisory: https://www.tibco.com/support/advisories/2021/03/tibco-security-advisory-march-9-2021-tibco-spotfire
Restart Required: Yes
Instructions:
1. Review TIBCO advisory for specific fixed versions. 2. Apply vendor-provided patches or upgrade to non-vulnerable versions. 3. Restart affected services. 4. Test functionality after patching.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement strict input validation and proper output encoding for user-controllable data
Content Security Policy
allImplement Content Security Policy headers to restrict script execution
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block XSS payloads
- Restrict network access to Spotfire applications to trusted users only
🔍 How to Verify
Check if Vulnerable:
Check Spotfire version against affected versions list in TIBCO advisoryCheck Version:
Check within Spotfire application interface or consult product documentationVerify Fix Applied:
Verify installed version is not in affected versions list and test XSS payloads are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual script tags or JavaScript in user inputs
- Multiple failed XSS attempts
Network Indicators:
- Suspicious script payloads in HTTP requests to Spotfire endpoints
SIEM Query:
web_requests WHERE (uri CONTAINS 'spotfire' AND (body CONTAINS '<script>' OR body CONTAINS 'javascript:'))