CVE-2020-3427 : Vulnerability Insights and Analysis
Learn about CVE-2020-3427 affecting Duo Authentication for Windows Logon and RDP. Discover the impact, technical details, and mitigation steps for this privilege escalation vulnerability.
Duo Authentication for Windows Logon and RDP has a privilege escalation vulnerability that allows attackers to manipulate files and potentially elevate privileges. The issue was reported by Ido Hoorvitch from CyberArk.
Understanding CVE-2020-3427
This CVE involves a security vulnerability in the Windows Logon installer for versions prior to 4.1.2, allowing attackers to write to privileged directories.
What is CVE-2020-3427?
The vulnerability in the Windows Logon installer before version 4.1.2 enables attackers with local user privileges to write to arbitrary privileged directories, potentially leading to Denial of Service (DoS) or privilege escalation.
The Impact of CVE-2020-3427
- CVSS Base Score: 6.6 (Medium Severity)
- Attack Vector: Local
- Confidentiality Impact: High
- Integrity Impact: High
- Privileges Required: Low
- User Interaction: Required
- Scope: Unchanged
- Attack Complexity: Low
- Availability Impact: None
Technical Details of CVE-2020-3427
The following technical details provide insight into the vulnerability and its implications.
Vulnerability Description
The vulnerability allows coercion of the installer to write to privileged directories, potentially leading to file manipulation, DoS, or privilege escalation.
Affected Systems and Versions
- Product: Duo Authentication for Windows Logon and RDP
- Vendor: Cisco
- Versions Affected: < 4.1.2 (Custom version)
Exploitation Mechanism
The vulnerability can be exploited by attackers with local user privileges during new installations while the installer is running.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices are crucial to mitigating the risks associated with CVE-2020-3427.
Immediate Steps to Take
- Upgrade to version 4.1.2 of Windows Logon to address the vulnerability.
- Monitor system files for any unauthorized changes.
- Restrict access to privileged directories.
Long-Term Security Practices
- Regularly update software and security patches.
- Conduct security training for users to prevent social engineering attacks.
- Implement least privilege access controls.
- Utilize intrusion detection systems to monitor for suspicious activities.
Patching and Updates
Ensure that all systems running Duo Authentication for Windows Logon and RDP are updated to version 4.1.2 to mitigate the vulnerability.