CVE-2024-20443
📋 TL;DR
This vulnerability allows an authenticated attacker with low privileges to conduct cross-site scripting (XSS) attacks against users of Cisco ISE's web management interface. It affects Cisco Identity Services Engine systems with insufficient input validation in specific web pages. Successful exploitation could lead to arbitrary script execution in the context of the management interface.
💻 Affected Systems
- Cisco Identity Services Engine (ISE)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker steals administrator session cookies or credentials, gains full administrative access to Cisco ISE, and potentially compromises the entire identity and access management infrastructure.
Likely Case
Attacker with low-privileged account steals session data from other users, escalates privileges, or performs actions on behalf of authenticated users.
If Mitigated
With proper input validation and output encoding, the attack would fail to execute malicious scripts, limiting impact to unsuccessful exploitation attempts.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of vulnerable interface pages
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Cisco Security Advisory for specific patched versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-xss-V2bm9JCY
Restart Required: Yes
Instructions:
1. Review Cisco Security Advisory for affected versions
2. Download appropriate patch/update from Cisco
3. Apply patch following Cisco ISE upgrade procedures
4. Restart affected services or system as required
🔧 Temporary Workarounds
Input Validation Enhancement
allImplement additional input validation and output encoding for web interface parameters
Access Control Restrictions
allRestrict web interface access to trusted networks and implement strong authentication
🧯 If You Can't Patch
- Implement web application firewall (WAF) with XSS protection rules
- Restrict low-privileged account access to management interface
🔍 How to Verify
Check if Vulnerable:
Check Cisco ISE version against affected versions in Cisco Security AdvisoryCheck Version:
show version (in Cisco ISE CLI)Verify Fix Applied:
Verify installed version matches or exceeds patched version specified in advisory📡 Detection & Monitoring
Log Indicators:
- Unusual input patterns in web interface logs
- Multiple failed authentication attempts followed by successful low-privilege login
- Suspicious JavaScript payloads in HTTP requests
Network Indicators:
- Unusual traffic patterns to management interface
- Requests containing script tags or JavaScript code to vulnerable endpoints
SIEM Query:
source="cisco_ise" AND (http_request CONTAINS "<script>" OR http_request CONTAINS "javascript:")