CVE-2020-3189 : Exploit Details and Defense Strategies
Learn about CVE-2020-3189, a high-severity vulnerability in Cisco Firepower Threat Defense Software, allowing attackers to cause denial of service by depleting system memory through VPN System Logging.
A vulnerability in the VPN System Logging functionality for Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a memory leak that can deplete system memory over time, leading to unexpected system behaviors or crashes.
Understanding CVE-2020-3189
This CVE involves a denial of service vulnerability in Cisco Firepower Threat Defense Software due to improper handling of system memory in VPN System Logging events.
What is CVE-2020-3189?
The vulnerability allows an attacker to exploit the VPN System Logging feature, causing memory leaks that can lead to system memory depletion and a denial of service condition.
The Impact of CVE-2020-3189
- CVSS Base Score: 8.6 (High Severity)
- Attack Vector: Network
- Availability Impact: High
- The vulnerability can result in systemwide denial of service if successfully exploited.
Technical Details of CVE-2020-3189
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability arises from the improper release of system memory in VPN System Logging events, allowing attackers to deplete system memory over time.
Affected Systems and Versions
- Affected Product: Cisco Firepower Threat Defense Software
- Vendor: Cisco
- Affected Version: Not applicable (n/a)
Exploitation Mechanism
Attackers can exploit the vulnerability by repeatedly creating or deleting VPN tunnel connections, causing memory leaks with each logging event.
Mitigation and Prevention
Protecting systems from CVE-2020-3189 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Disable VPN System Logging if not essential
- Monitor system memory usage for unusual patterns
- Implement network-level controls to detect and block malicious activities
Long-Term Security Practices
- Regularly update software and security patches
- Conduct security assessments and audits to identify vulnerabilities
- Train employees on cybersecurity best practices
Patching and Updates
- Apply patches and updates provided by Cisco to address the vulnerability