CVE-2024-20503
📋 TL;DR
This vulnerability in Cisco Duo Epic for Hyperdrive allows authenticated local attackers to view sensitive information stored unencrypted in a registry key. It affects systems running vulnerable versions of Cisco Duo Epic for Hyperdrive where an attacker has local access. The risk is limited to information disclosure rather than system compromise.
💻 Affected Systems
- Cisco Duo Epic for Hyperdrive
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could extract sensitive authentication or configuration data, potentially enabling further attacks or credential theft.
Likely Case
A low-privileged user on a shared system could access sensitive configuration information that should be protected.
If Mitigated
With proper access controls and monitoring, the impact is limited to information disclosure on already-compromised systems.
🎯 Exploit Status
Exploitation requires authenticated local access and involves querying a specific registry key.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Cisco advisory for specific fixed versions
Vendor Advisory: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-duo-epic-info-sdLv6h8y
Restart Required: Yes
Instructions:
1. Review Cisco advisory for affected versions. 2. Download and install the latest version of Cisco Duo Epic for Hyperdrive. 3. Restart affected systems. 4. Verify the registry key is now properly encrypted.
🔧 Temporary Workarounds
Restrict Registry Access
windowsApply stricter permissions to the vulnerable registry key to prevent unauthorized access.
reg add "HKLM\SOFTWARE\Cisco\DuoEpic" /v SensitiveKey /t REG_SZ /d "encrypted_value" /f
icacls "HKLM\SOFTWARE\Cisco\DuoEpic" /deny "Users":(R)
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges on affected systems.
- Monitor registry access attempts and implement alerting for suspicious activity.
🔍 How to Verify
Check if Vulnerable:
Check if Cisco Duo Epic for Hyperdrive is installed and review the registry key HKLM\SOFTWARE\Cisco\DuoEpic for unencrypted sensitive data.Check Version:
Check installed version through Windows Programs and Features or using wmic product where name="Cisco Duo Epic for Hyperdrive" get versionVerify Fix Applied:
After patching, verify the registry key contains encrypted data and cannot be read by low-privileged users.📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing registry access by non-admin users to the Cisco Duo Epic registry path
Network Indicators:
- No network indicators - this is a local vulnerability
SIEM Query:
EventID=4656 OR EventID=4663 AND ObjectName="*Cisco*DuoEpic*" AND SubjectUserName NOT IN ("SYSTEM", "Administrators")