CVE-2022-20633
📋 TL;DR
This vulnerability in Cisco ECE allows unauthenticated remote attackers to enumerate valid usernames by analyzing differences in authentication responses. Attackers can confirm existing user accounts, which could facilitate credential stuffing or targeted attacks. Only Cisco ECE systems with the vulnerable web management interface are affected.
💻 Affected Systems
- Cisco Enterprise Chat and Email (ECE)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain valid usernames, then use credential stuffing or social engineering to gain unauthorized access, potentially leading to full system compromise.
Likely Case
Attackers enumerate valid usernames and use them for targeted password attacks or reconnaissance for further exploitation.
If Mitigated
With proper network segmentation and monitoring, impact is limited to username disclosure without further system access.
🎯 Exploit Status
Exploitation requires sending authentication requests and analyzing response differences. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 12.6(2)ES3 and later
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ece-multivulns-kbK2yVhR
Restart Required: Yes
Instructions:
1. Download patch from Cisco Software Center. 2. Backup configuration. 3. Apply patch following Cisco ECE upgrade procedures. 4. Restart system. 5. Verify version with 'show version' command.
🧯 If You Can't Patch
- Restrict network access to ECE management interface using firewall rules or network segmentation.
- Implement account lockout policies and monitor for authentication attempts.
🔍 How to Verify
Check if Vulnerable:
Check Cisco ECE version with 'show version' command. If version is prior to 12.6(2)ES3, system is vulnerable.Check Version:
show versionVerify Fix Applied:
After patching, verify version is 12.6(2)ES3 or later using 'show version' command.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts from single source
- Authentication attempts with non-existent usernames
- Unusual patterns in web interface access logs
Network Indicators:
- HTTP POST requests to authentication endpoints from unauthorized sources
- Unusual traffic to management interface
SIEM Query:
source="ece_logs" AND (event_type="authentication_failure" OR event_type="login_attempt") | stats count by src_ip, username | where count > threshold